Gerrit Code Review - Configuration

The url of accountPatchReviewDb. Supported types are CLOUDSPANNER, H2, POSTGRESQL, MARIADB, and MYSQL. Drop the driver jar in the lib folder of the site path if the Jdbc driver of the corresponding Database is not yet in the class path.

Default is to create H2 database in the db folder of the site path.

Changing this parameter requires to migrate database using the MigrateAccountPatchReviewDb program. Migration cannot be done while the server is running.

Also note that the db_name has to be a new db and not reusing an old ReviewDb database from a former 2.x site, otherwise gerrit’s init will remove the table.

Maximum number of open database connections. If the server needs more than this number, request processing threads will wait up to poolMaxWait seconds for a connection to be released before they abort with an exception. This limit must be several units higher than the total number of httpd and sshd threads as some request processing code paths may need multiple connections.

Default is sshd.threads + httpd.maxThreads + 2.

Minimum number of connections to keep idle in the pool. Default is 4.

Maximum number of connections to keep idle in the pool. If there are more idle connections, connections will be closed instead of being returned back to the pool. Default is min(accountPatchReviewDb.poolLimit, 16).

Maximum amount of time a request processing thread will wait to acquire a database connection from the pool. If no connection is released within this time period, the processing thread will abort its current operations and return an error to the client. Values should use common unit suffixes to express their setting:

If a unit suffix is not specified, milliseconds is assumed. Default is 30 seconds.

Controls visibility of other users' dashboard pages and completion suggestions to web users.

If ALL, all users are visible to all other users, even anonymous users.

If SAME_GROUP, only users who are also members of a group the current user is a member of are visible.

If VISIBLE_GROUP, only users who are members of at least one group that is visible to the current user are visible.

If NONE, no users other than the current user are visible.

Default is ALL.

If a user account does not have a display name set, which is the normal case, then this configuration value chooses the strategy how to choose the display name. Note that this strategy is not applied by the backend. If the AccountInfo has the display name unset, then the client has to apply this strategy.

If FULL_NAME, then the (full) name of the user is chosen from AccountInfo.

If FIRST_NAME, then the first word (i.e. everything until first whitespace character) of the (full) name of the user is chosen from AccountInfo.

If USERNAME, then the username of the user is chosen from AccountInfo. If that is not set, then the (full) name will be used.

Default is FULL_NAME.

The maximum number of reviewers a user can add at once by adding a group as reviewer without being asked to confirm the operation.

If set to 0, the user will never be asked to confirm adding a group as reviewer.

Default is 10.

This setting only applies for adding reviewers in the Gerrit Web UI, but is ignored when adding reviewers with the set-reviewers command.

This value supports configuration reloads.

The maximum number of reviewers a user can add at once by adding a group as reviewer.

If set to 0, there is no limit for the number of reviewers that can be added at once by adding a group as reviewer.

Default is 20.

This value supports configuration reloads.

The weight that will be applied in the default reviewer ranking algorithm. This can be increased or decreased to give more or less influence to plugins. If set to zero, the base ranking will not have any effect. Reviewers will then be ordered as ranked by the plugins (if there are any).

By default 1.

Type of user authentication employed by Gerrit. The supported values are:

By default, OpenID.

List of permitted OpenID providers. A user may only authenticate with an OpenID that matches this list. Only used if auth.type is set to OpenID (the default).

Patterns may be either a standard Java regular expression (java.util.regex) (start with ^ and end with $) or be a simple prefix (any other string).

By default, the list contains two values, http:// and https://, allowing users to authenticate with any OpenID provider.

List of trusted OpenID providers. Only used if auth.type is set to OpenID (the default).

In order for a user to take advantage of permissions beyond those granted to the Anonymous Users and Registered Users groups, the user account must only have OpenIDs which match at least one pattern from this list.

Patterns may be either a standard Java regular expression (java.util.regex) (start with ^ and end with $) or be a simple prefix (any other string).

By default, the list contains two values, http:// and https://, allowing Gerrit to trust any OpenID it receives.

List of allowed OpenID email address domains. Only used if auth.type is set to OPENID or OPENID_SSO.

Domain is case insensitive and must be in the same form as it appears in the email address, for example, "example.com".

By default, any domain is accepted.

Time in seconds before an OpenID provider must force the user to authenticate themselves again before authentication to this Gerrit server. Currently this is only a polite request, and users coming from providers that don’t support the PAPE extension will be accepted anyway. In the future it may be enforced, rejecting users coming from providers that don’t honor the max session age.

If set to 0, the provider will always force the user to authenticate (e.g. supply their password). Values should use common unit suffixes to express their setting:

Default is -1, permitting infinite time between authentications.

Private key to use when generating an email verification token.

If not set, a random key is generated when running the site initialization.

Time in seconds before an email verification token sent to a user in order to validate their email address expires.

Default is 12 hours.

The SSO entry point URL. Only used if auth.type is set to OpenID_SSO.

The "Sign In" link will send users directly to this URL.

HTTP header to trust the username from, or unset to select HTTP basic authentication. Only used if auth.type is set to HTTP.

HTTP header to retrieve the user’s display name from. Only used if auth.type is set to HTTP.

If set, Gerrit trusts and enforces the user’s full name using the HTTP header and disables the ability to manually modify the user’s full name from the contact information page.

HTTP header to retrieve the user’s e-mail from. Only used if auth.type is set to HTTP.

If set, Gerrit trusts and enforces the user’s e-mail using the HTTP header and disables the ability to manually modify or register other e-mails from the contact information page.

HTTP header to retrieve the user’s external identification token. Only used if auth.type is set to HTTP.

If set, Gerrit adds the value contained in the HTTP header to the user’s identity. Typical use is with a federated identity token from an external system (e.g. GitHub OAuth 2.0 authentication) where the user’s auth token exchanged during authentication handshake needs to be used for authenticated communication to the external system later on.

Example: auth.httpExternalIdHeader: X-GitHub-OTP

URL to redirect a browser to after the end-user has clicked on the login link in the upper right corner. Only used if auth.type is set to HTTP or HTTP_LDAP. Organizations using an enterprise single-sign-on solution may want to redirect the browser to the SSO product’s sign-in page for completing the login process and validate their credentials.

If set, Gerrit allows anonymous access until the end-user performs the login and provides a trusted identity through the HTTP header. If not set, Gerrit requires the HTTP header with a trusted identity and returns the error page 'LoginRedirect.html' if such a header is not present.

Text displayed in the loginUrl link. Only used if auth.loginUrl is set.

If not set, the "Sign In" text is used.

URL of the registration page to use when a new user logs in to Gerrit for the first time. Used only when auth.type is set to HTTP.

If not set, the standard Gerrit registration page /#/register/ is displayed.

URL to redirect a browser to after the end-user has clicked on the "Sign Out" link in the upper right corner. Organizations using an enterprise single-sign-on solution may want to redirect the browser to the SSO product’s sign-out page.

If not set, the redirect returns to the list of all open changes.

Target for the "Register" link in the upper right corner. Used only when auth.type is LDAP, LDAP_BIND or CUSTOM_EXTENSION.

If not set, no "Register" link is displayed.

Text for the "Register" link in the upper right corner. Used only when auth.type is LDAP, LDAP_BIND or CUSTOM_EXTENSION.

If not set, defaults to "Register".

Target for the "Edit" button when the user is allowed to edit their full name. Used only when auth.type is LDAP, LDAP_BIND or CUSTOM_EXTENSION.

Target for the "Obtain Password" link. Used only when auth.type is CUSTOM_EXTENSION.

URL to switch user identities and login as a different account than the currently active account. This is disabled by default except when auth.type is OPENID and DEVELOPMENT_BECOME_ANY_ACCOUNT. If set the "Switch Account" link is displayed next to "Sign Out".

When auth.type does not normally enable this URL administrators may set this to login/, allowing users to begin a new web session. This value is used as an href in the Gerrit web app, so absolute URLs like https://someotherhost/login work as well.

If a ${path} parameter is included, then the Gerrit web app will substitute the currently viewed path in the link. Be aware that this path will include a leading slash, so a value like this might be appropriate: /login${path}.

Sets "path" attribute of the authentication cookie.

If not set, HTTP request’s path is used.

Sets "domain" attribute of the authentication cookie.

If not set, HTTP request’s domain is used.

Sets "secure" flag of the authentication cookie. If true, cookies will be transmitted only over HTTPS protocol.

By default, false.

Optional format string to construct user email addresses out of user login names. Only used if auth.type is HTTP, HTTP_LDAP or LDAP.

This value can be set to a format string, where {0} is replaced with the login name. E.g. "{0}+gerrit@example.com" with a user login name of "foo" will produce "foo+gerrit@example.com" during the first time user "foo" registers.

If the site is using HTTP_LDAP or LDAP, using this option is discouraged. Setting ldap.accountEmailAddress and importing the email address from the LDAP directory is generally preferred.

Controls whether or not the contributor agreement features are enabled for the Gerrit site. If enabled a user must complete a contributor agreement before they can upload changes.

If enabled, the admin must also add one or more contributor-agreement sections in project.config and create agreement files under '$site_path'/static, so users can actually complete one or more agreements.

By default this is false (no agreements are used).

To enable the actual usage of contributor agreement the project specific config option in the project.config must be set: receive.requireContributorAgreement.

If true then it is the responsibility of the container hosting Gerrit to authenticate users. In this case Gerrit will blindly trust the container.

This parameter only affects git over http traffic. If set to false then Gerrit will do the authentication (using Basic authentication).

By default this is set to false.

When auth.type is LDAP, LDAP_BIND or OAUTH, it allows using either the generated HTTP password, the LDAP or OAUTH password, or a combination of HTTP and LDAP authentication, to authenticate Git over HTTP and REST API requests. The supported values are:

*HTTP

Only the HTTP password is accepted when doing Git over HTTP and REST API requests.

*LDAP

Only the LDAP password is allowed when doing Git over HTTP and REST API requests.

*OAUTH

Only the OAUTH authentication is allowed when doing Git over HTTP and REST API requests.

*HTTP_LDAP

The password in the request is first checked against the HTTP password and, if it does not match, it is then validated against the LDAP password.

By default this is set to LDAP when auth.type is LDAP and OAUTH when auth.type is OAUTH. Otherwise, the default value is HTTP.

When gitBasicAuthPolicy is set to LDAP or HTTP_LDAP and the user is authenticating with the LDAP username/password, the Git client config needs to have http.cookieFile set to a local file, otherwise every single call would trigger a full LDAP authentication and groups resolution which could introduce a noticeable latency on the overall execution and produce unwanted load to the LDAP server.

Selects the OAuth 2 provider to authenticate git over HTTP traffic with.

In general there is no way to determine from an access token alone, which OAuth 2 provider to address to verify that token, and the BasicAuth scheme does not support amending such details. If multiple OAuth provider plugins in a system offer support for git over HTTP authentication site administrators must configure, which one to use as default provider. In case the provider cannot be determined from a request the access token will be sent to the default provider for verification.

The value of this parameter must be the identifier of an OAuth 2 provider in the form plugin-name:provider-name. Consult the respective plugin documentation for details.

If set the username that is received to authenticate a git operation is converted to lower case for looking up the user account in Gerrit.

By setting this parameter a case insensitive authentication for the git operations can be achieved, if it is ensured that the usernames in Gerrit (scheme username) are stored in lower case (e.g. if the parameter ldap.accountSshUserName is set to ${sAMAccountName.toLowerCase}). It is important that for all existing accounts this username is already in lower case. It is not possible to convert the usernames of the existing accounts to lower case because this would break the access to existing per-user branches and Gerrit provides no tool to do such a conversion. Accounts created using the REST API or the create-account SSH command will be created with all lowercase characters, when this option is set.

Setting this parameter to true will prevent all users from login that have a non-lower-case username.

This parameter only affects git over http and git over SSH traffic.

By default this is set to false.

If set the username will be handled case insensitively but case preserving, i.e. a user can login with johndoe or JohnDoe for the same account created for JohnDoe. The form of the username used during account creation will be used wherever the username is displayed. Sandbox branches created for a user can also only be created for this original form.

Note, that this does not work for all existing accounts, if they were not originally created with all lowercase, since the note keys of the external IDs will not match the new scheme. For more details refer to the External ID documentation.

Gerrit provides the offline and the online online tools to migrate existing accounts to match the new scheme.

Naturally, if there were two accounts only different in capitalization, e.g. johndoe and JohnDoe, the account JohnDoe will not be able to authenticate anymore after setting this option. If such duplicate accounts exist the migration tool will fail, since the newly computed note name would be identical and thus conflict. These duplicates thus have to be deleted manually by deleting the respective external ID.

For newly initialized sites this option defaults to true.

Default is false.

Setting migration mode to true allows to fallback to case sensitive behaviour if the migrated external ID cannot be found. This allows to trigger the migration while Gerrit process is running.

Default is false.

If true HTTP REST APIs will accept the X-Gerrit-RunAs HTTP request header from any users granted the Run As capability. The header and capability permit the authenticated user to impersonate another account.

If false the feature is disabled and cannot be re-enabled without editing gerrit.config and restarting the server.

Default is true.

Whether users are allowed to register new email addresses.

In addition for the HTTP authentication type auth.httpemailheader must not be set to enable registration of new email addresses.

By default, true.

Whether to allow automatic synchronization of an account’s inactive flag upon login.

If set to true, upon login, if the authentication back-end reports the account as active, the account’s inactive flag in NoteDb will be updated to be active.

If the authentication back-end reports the account as inactive, the account’s flag will be updated to be inactive and the login attempt will be blocked. Users enabling this feature should ensure that their authentication back-end is supported. Currently, only strict 'LDAP' authentication is supported.

In addition, if this parameter is not set, or false, the corresponding scheduled task to deactivate inactive Gerrit accounts will also be disabled. If this parameter is set to true, users should also consider configuring the accountDeactivation section appropriately.

By default, false.

Whether to skip the full ref visibility checks as a performance shortcut when a user has READ permission for all refs.

The full ref filtering would filter out refs for pending edits, private changes and auto merge commits.

By default, true.

Number of threads to use when running asynchronous cache tasks. The threads executor is delegated to when sending removal notifications to listeners, when asynchronous computations like refresh, refreshAfterWrite are performed, or when performing periodic maintenance.

NOTE: Setting it to 0 disables the dedicated thread pool and indexing will be done in the same thread as the operation. This may result in evictions taking longer because the listeners are executed in the caller’s thread.

By default, the JVM common ForkJoinPool is used.

Path to a local directory where Gerrit can write cached entities for future lookup. This local disk cache is used to retain potentially expensive to compute information across restarts. If the location does not exist, Gerrit will try to create it.

Technically, cached entities are persisted as a set of H2 databases inside this directory.

If not absolute, the path is resolved relative to $site_path.

Default is unset, no disk cache.

Whether to enable the computation of disk statistics of persistent caches. This computation is expensive and requires a long time on larger installations.

By default, false.

The size of the in-memory cache for each opened H2 cache database, in bytes.

Some caches of Gerrit are persistent and are backed by an H2 database. H2 uses memory to cache its database content. The parameter h2CacheSize allows to limit the memory used by H2 and thus prevent out-of-memory caused by the H2 database using too much memory.

Technically the H2 cache size is configured using the CACHE_SIZE parameter in the H2 JDBC connection URL, as described here

Default is unset, using up to half of the available memory.

H2 will persist this value in the database, so to unset explicitly specify 0.

Common unit suffixes of 'k', 'm', or 'g' are supported.

If set to true, enable H2 autoserver mode for the H2-backed persistent cache databases.

See here for detail.

Default is false.

The number of file descriptors to add to the limit set by the Gerrit daemon.

Persistent caches are stored on the file system and as such participate in the file descriptors utilization. The number of file descriptors can vary depending on the cache configuration and the specific backend used.

The additional file descriptors required by the cache should be accounted for via this setting, so that the Gerrit daemon can adjust the ulimit accordingly.

If you increase this to a larger setting you may need to also adjust the ulimit on file descriptors for the host JVM, as Gerrit needs additional file descriptors available for network sockets and other repository data manipulation.

Default is 0.

Maximum age to keep an entry in the cache. Values should use common unit suffixes to express their setting:

The total cost of entries to retain in memory. The cost computation varies by the cache. For most caches where the in-memory size of each entry is relatively the same, memoryLimit is currently defined to be the number of entries held by the cache (each entry costs 1).

For caches where the size of an entry can vary significantly between individual entries (notably "git_modified_files", "modified_files", "git_file_diff", "gerrit_file_diff", "diff_intraline"), memoryLimit is an approximation of the total number of bytes stored by the cache. Larger entries that represent bigger patch sets or longer source files will consume a bigger portion of the memoryLimit. For these caches the memoryLimit should be set to roughly the amount of RAM (in bytes) the administrator can dedicate to the cache.

Default is 1024 for most caches, except:

NOTE: When the cache is disabled, there is no locking when accessing the same key/value, and therefore multiple threads may load the same value concurrently with a higher memory footprint. To keep a minimum caching and avoid concurrent loading of the same key/value, set memoryLimit to 1 and maxAge to 1.

Time after last access to automatically expire entries from an in-memory cache. If 0 or not specified, entries are never expired in this manner. Values may use unit suffixes as in maxAge.

This option only applies to in-memory caches; persistent cache values are not expired in this manner, and are only pruned via diskLimit.

Total size in bytes of the keys and values stored on disk. Caches that have grown bigger than this size are scanned daily at 1 AM local server time to trim the cache. Entries are removed in least recently accessed order until the cache fits within this limit. Caches may grow larger than this during the day, as the size check is only performed once every 24 hours.

Default is 128 MiB per cache, except:

If 0 or negative, disk storage for the cache is disabled.

Duration after which we asynchronously refresh the cached value.

Values should use common unit suffixes to express their setting:

Number of threads that are available to refresh cached values that became out of date. This applies only to these caches that support refreshing:

Names of groups of users that are allowed to exercise the administrateServer capability, in addition to those listed in All-Projects. Configuring this option can be a useful fail-safe to recover a server in the event an administrator removed all groups from the administrateServer capability, or to ensure that specific groups always have administration capabilities.

The configuration file uses group names, not UUIDs. If a group is renamed the gerrit.config file must be updated to reflect the new name. If a group cannot be found for the configured name a warning is logged and the server will continue normal startup.

If not specified (default), only the groups listed by All-Projects may use the administrateServer capability.

Whether the first user that logs in to the Gerrit server should automatically be added to the administrator group and hence get the administrateServer capability assigned. This is useful to bootstrap the account data.

Default is true.

Allow blame on side by side diff. If set to false, blame cannot be used.

Default is true.

When reviewing merge commits, the left-hand side shows the output of the result of JGit’s automatic merge algorithm. This option controls whether this output is cached in the change repository, or if only the diff is cached in the persistent diff caches ("git_modified_files", modified_files, "git_file_diff", "file_diff").

If true, automerge results are stored in the repository under refs/cache-automerge/*; the results of diffing the change against its automerge base are stored in the diff caches. If false, no extra data is stored in the repository, only the diff caches. This can result in slight performance improvements by reducing the number of refs in the repo.

Default is true.

Maximum allowed size in characters of a regular (non-robot) comment. Comments which exceed this size will be rejected. Size computation is approximate and may be off by roughly 1%. Common unit suffixes of 'k', 'm', or 'g' are supported. The value must be positive.

The default limit is 16kiB.

Maximum allowed number of changes with the same topic. 0 or negative values mean "unlimited".

By default 5,000.

Maximum allowed size in characters of all comments (including robot comments) and change messages. Size computation is approximate and may be off by roughly 1%. Common unit suffixes of 'k', 'm', or 'g' are supported.

The default limit is 3MiB.

If set to true, users are not allowed to create private changes.

The default is false.

Maximum number of comments (regular plus robot) allowed per change. Additional comments are rejected.

By default 5,000.

Maximum number of files allowed per change. Larger changes are rejected and must be split up. For merge changes we are comparing against the auto-merge commit, so we allow large merges, if they merge cleanly.

By default 100,000.

The GetContent and DownloadContent REST APIs will refuse to load files larger than this limit (in bytes). 0 or negative values mean "unlimited".

By default 0 (unlimited).

Maximum number of patch sets allowed per change. If this is insufficient, recreate the change with a new Change-Id, then abandon the old change.

By default 1000.

Maximum number of updates to a change. Counts only updates to the main NoteDb meta ref; draft comments, robot comments, stars, etc. do not count towards the total.

Many NoteDb operations require walking the entire change meta ref and loading its contents into memory, so changes with arbitrarily many updates may cause high CPU usage, memory pressure, persistent cache bloat, and other problems.

The following operations are allowed even when a change is at the limit:

This setting determines when Gerrit computes if a change is mergeable or not. This computation is expensive, especially when the repository is large or when there are many open changes.

This config can have the following states:

This setting determines when Gerrit renders conflict changes section on change screen and also supports conflicts predicate. This computation is expensive, computing ConflictsPredicate has a runtime complexity of O(nˆ2) with n number of open changes on a branch. When set to false GUI will silently ignore the error message and leave the conflict changes section on change screen empty. See also implications on rendering of conflict changes section in configuration section:change.mergeabilityComputationBehavior.

Maximum number of changes that can be chained together in the same repository to be submitted at once.

Default is 32767.

Whether the Move Change REST endpoint is enabled.

The move change functionality has some corner cases with undesired side effects. Hence administrators may decide to disable this functionality. In particular, if a change that has dependencies on other changes is moved to a new branch, and the moved change gets submitted to the new branch, the changes on which the change depends are silently merged into the new branch, although these changes have not been moved to that branch (see details in issue 40009784).

By default true.

Are robot comments enabled in the Gerrit UI? This setting allows phasing out robot comments.

By default true.

If a SubmitRequirement evaluation for a given change results in an ERROR status, abort the REST response with an HTTP 500 error.

The ERROR status can occur if a SubmitRequirement uses a plugin-provided predicate (and the plugin is not available), due to bugs, or due to bypassing the validation that normally happens when updating refs/meta/config.

Enabling this flag makes gerrit unusuable under such conditions, so it is generally not recommended. However, this makes the application-specific ERROR status into a generic HTTP error, and can thus be acted on by automated deployment and monitoring infrastructure.

Maximum allowed size in characters of a robot comment. Robot comments which exceed this size will be rejected on addition. Size computation is approximate and may be off by roughly 1%. Common unit suffixes of 'k', 'm', or 'g' are supported. Zero or negative values allow robot comments of unlimited size.

The default limit is 1MiB.

When false, emails will not be sent to owners, reviewers, and cc for creating a new patchset unless they are project watchers or have starred the change.

Default is true.

Show assignee field in changes table. If set to false, assignees will not be visible in changes table.

Default is false.

Reject invalid label votes: invalid labels or invalid values. This configuration option is provided for backwards compatibility and may be removed in future gerrit versions.

Default is false.

Label name for the submit button.

Default is "Submit".

Label name for the submit button if the change has parents which will be submitted together with this change.

Default is "Submit including parents".

Tooltip for the submit button. Variables available for replacement include ${patchSet} for the current patch set number (1, 2, 3), ${branch} for the branch name ("master") and ${commit} for the abbreviated commit SHA-1 (c9c0edb).

Default is "Submit patch set ${patchSet} into ${branch}".

Tooltip for the submit button if there are ancestors which would also be submitted by submitting the change. Additionally to the variables as in change.submitTooltip, there is the variable ${submitSize} indicating the number of changes which are submitted.

Default is "Submit all ${topicSize} changes of the same topic (${submitSize} changes including ancestors and other changes related by topic)".

If change.submitWholeTopic is set and a change has a topic, the label name for the submit button is given here instead of the configuration change.submitLabel.

Defaults to "Submit whole topic"

If change.submitWholeTopic is configured to true and a change has a topic, this configuration determines the tooltip for the submit button instead of change.submitTooltip. The variable ${topicSize} is available for the number of changes in the same topic to be submitted. The number of all changes to be submitted is in the variable ${submitSize}.

Defaults to "Submit all ${topicSize} changes of the same topic (${submitSize} changes including ancestors and other changes related by topic)".

Determines if the submit button submits the whole topic instead of just the current change.

Default is false.

How often in seconds the web interface should poll for updates to the currently open change. The poller relies on the client’s browser cache to use If-Modified-Since and respect 304 Not Modified HTTP responses. This allows for fast polls, often under 8 milliseconds.

With a configured 30 second delay a server with 4900 active users will typically need to dedicate 1 CPU to the update check. 4900 users divided by an average delay of 30 seconds is 163 requests arriving per second. If requests are served at \~6 ms response time, 1 CPU is necessary to keep up with the update request traffic. On a smaller user base of 500 active users, the default 30 second delay is only 17 requests per second and requires ~10% CPU.

If 0 the update polling is disabled.

Default is 5 minutes.

Use the diff3 formatter for merge commits with conflicts. With diff3 when the conflicts are shown in the "Auto Merge" view, the base section from the common parents will be shown as well. This setting takes effect when generating the automerge, which happens on upload. Changing the setting leaves existing changes unaffected.

Default is false.

The threshold of file sizes in megabytes beyond which a file diff request will fail.

If not set or set to zero, no limits are applied on file sizes.

Period of inactivity after which open changes should be abandoned automatically.

By default 0, never abandon open changes.

[WARNING] Auto-Abandoning changes may confuse/annoy users. When enabling this, make sure to choose a reasonably large grace period and inform users in advance.

The following suffixes are supported to define the time unit:

Whether changes which are mergeable should be auto-abandoned. When set to false, -is:mergeable is appended to the query used to find the changes to auto-abandon.

By default true, meaning mergeable changes are auto-abandoned.

If change.mergeabilityComputationBehavior is set to NEVER, setting this option to false has no effect and it behaves as though it were set to true.

Whether accountPatchReview data should be also removed when change gets auto-abandoned.

By default false.

Change message that should be posted when a change is abandoned.

'${URL}' can be used as a placeholder for the Gerrit web URL.

By default "Auto-Abandoned due to inactivity, see ${URL}Documentation/user-change-cleanup.html#auto-abandon\n\n If this change is still wanted it should be restored.".

The start time for running change cleanups.

The interval for running change cleanups.

Period of inactivity after which open no-WIP/private changes should have change owner added to attention-set automatically (if they are not already).

By default 0, never readd change owner.

[WARNING] Auto-readding change owners may confuse/annoy users. When enabling this, make sure to choose a reasonably large grace period and inform users in advance.

The following suffixes are supported to define the time unit:

Attention-set message that should be shown as reason when an change owner is readded.

'${URL}' can be used as a placeholder for the Gerrit web URL.

By default "Owner readded to attention-set due to inactivity, see ${URL}Documentation/user-attention-set.html#auto-readd-owner\n\n If you do not want to be readded to the attention-set when the timer has counted down. Set this change as WIP or private.".

The start time for running readd owner to attention-set.

The interval for running readd owner to attention-set.

A JavaScript regular expression to match positions to be replaced with a hyperlink. Subexpressions of the matched string can be stored using groups and accessed with $'n' syntax, where 'n' is the group number, starting from 1.

The configuration file parser eats one level of backslashes, so the character class \s requires \\s in the configuration file. The parser also terminates the line at the first #, so a match expression containing # must be wrapped in double quotes.

To match case insensitive strings, a character class with both the upper and lower case character for each position must be used. For example, to match the string bug in a case insensitive way the match pattern [bB][uU][gG] needs to be used.

The commentlink.name.match regular expressions are applied to the raw, unformatted and unescaped text form. Regex matching against HTML is not supported. Comment link patterns that are written in this style should be updated to match text formats.

A common pattern to match is bug\\s+(\\d+).

In order to better control the visual presentation of the link prefix, suffix and text is used. With the generated link html looking like: prefix<a …​>text</a>suffix.

The URL to direct the user to whenever the regular expression is matched. Groups in the match expression may be accessed as $'n'.

The text inserted before the link. Groups in the match expression may be accessed as $'n'.

The text inserted after the link. Groups in the match expression may be accessed as $'n'.

The text content of the link. Groups in the match expression may be accessed as $'n'.

If not specified defaults to $& (the matched text).

Whether the comment link is enabled. A child project may override a section in a parent or the site-wide config that is disabled by specifying enabled = true.

By default, true.

Note that the names and contents of disabled sections are visible even to anonymous users via the REST API.

Maximum heap size of the Java process running Gerrit, in bytes. This property is translated into the '-Xmx' flag for the JVM.

Default is platform and JVM specific.

Common unit suffixes of 'k', 'm', or 'g' are supported.

Path of the JRE/JDK installation to run Gerrit with. If not set, the Gerrit startup script will attempt to search your system and guess a suitable JRE. Overrides the environment variable 'JAVA_HOME'.

Additional options to pass along to the Java runtime. May be specified multiple times to configure multiple values. If multiple values are configured, they are passed in order on the command line, separated by spaces. These options are appended onto 'JAVA_OPTIONS'.

For example, it is possible to overwrite Gerrit’s default log4j configuration:

Gerrit built-in loggers are then ignored: error logger (error_log file), httpd.requestLog and sshd.requestLog. The log.jsonLogging and log.textLogging options are also ignored.

Additional options to pass to the daemon (e.g. '--enable-httpd'). If multiple values are configured, they are passed in that order to the command line, separated by spaces.

Execute java -jar gerrit.war daemon --help to see all possible options.

Used on Gerrit replica installations. If set to true the Gerrit JVM is called with the '--replica' switch, enabling replica mode. If no value is set (or any other value), Gerrit defaults to primary mode enabling write operations.

Backward compatibility for container.replica config setting.

The maximum time (in seconds) to wait for a gerrit.sh start command to run a new Gerrit daemon successfully. If not set, defaults to 90 seconds.

Login name (or UID) of the operating system user the Gerrit JVM will execute as. If not set, defaults to the user who launched the 'gerrit.sh' wrapper script.

Path of the JAR file to start daemon execution with. This should be the path of the local 'gerrit.war' archive. Overrides the environment variable 'GERRIT_WAR'.

If not set, defaults to '$site_path/bin/gerrit.war', or to '$HOME/gerrit.war'.

Number of bytes of a pack file to load into memory in a single read operation. This is the "page size" of the JGit buffer cache, used for all pack access operations. All disk IO occurs as single window reads. Setting this too large may cause the process to load more data than is required; setting this too small may increase the frequency of read() system calls.

Default on JGit is 8 KiB on all platforms.

Common unit suffixes of 'k', 'm', or 'g' are supported.

Maximum number of bytes to load and cache in memory from pack files. If JGit needs to access more than this many bytes it will unload less frequently used windows to reclaim memory space within the process. As this buffer must be shared with the rest of the JVM heap, it should be a fraction of the total memory available.

Default on JGit is 10 MiB on all platforms.

Common unit suffixes of 'k', 'm', or 'g' are supported.

Set to true in order to use strong references to reference packfile pages cached in the WindowCache. Otherwise SoftReferences are used. If this option is set to false, the Java garbage collector will flush the WindowCache to free memory if the used heap comes close to the maximum heap size. This has the advantage that it can quickly reclaim memory which was used by the WindowCache but comes at the price that the previously cached pack file content needs to be again copied from the file system cache to the Gerrit process. Setting this option to true prevents flushing the WindowCache which provides more predictable performance.

Default is false.

Maximum number of bytes to reserve for caching base objects that multiple deltafied objects reference. By storing the entire decompressed base object in a cache Git is able to avoid unpacking and decompressing frequently used base objects multiple times.

Default on JGit is 10 MiB on all platforms. You probably do not need to adjust this value.

Common unit suffixes of 'k', 'm', or 'g' are supported.

Maximum number of pack files to have open at once. A pack file must be opened in order for any of its data to be available in a cached window.

If you increase this to a larger setting you may need to also adjust the ulimit on file descriptors for the host JVM, as Gerrit needs additional file descriptors available for network sockets and other repository data manipulation.

Default on JGit is 128 file descriptors on all platforms.

Largest object size, in bytes, that JGit will allocate as a contiguous byte array. Any file revision larger than this threshold will have to be streamed, typically requiring the use of temporary files under '$GIT_DIR/objects' to implement pseudo-random access during delta decompression.

Servers with very high traffic should set this to be larger than the size of their common big files. For example a server managing the Android platform typically has to deal with ~10-12 MiB XML files, so 15 m would be a reasonable setting in that environment. Setting this too high may cause the JVM to run out of heap space when handling very big binary files, such as device firmware or CD-ROM ISO images.

Defaults to 25% of the available JVM heap, limited to 2g.

Common unit suffixes of 'k', 'm', or 'g' are supported.

When true, JGit will use mmap() rather than malloc()+read() to load data from pack files. The use of mmap can be problematic on some JVMs as the garbage collector must deduce that a memory mapped segment is no longer in use before a call to munmap() can be made by the JVM native code.

In server applications (such as Gerrit) that need to access many pack files, setting this to true risks artificially running out of virtual address space, as the garbage collector cannot reclaim unused mapped spaces fast enough.

Default on JGit is false. Although potentially slower, it yields much more predictable behavior.

Size of the buffer to store logging events for asynchronous logging. Putting a larger value can protect threads from stalling when the AsyncAppender threads are not fast enough to consume the logging events from the buffer. It also protects from losing log entries in this case.

Default is 64 entries.

Use JGit’s recursive merger for three-way merges. This only affects projects that allow content merges.

As explained in this blog, the recursive merge produces better results if the two commits that are merged have more than one common predecessor.

Default is true.

Delay between each periodic cleanup of expired repositories.

Values can be specified using standard time unit abbreviations (ms, sec, min, etc.).

Set it to 0 in order to switch off cache expiration. If cache expiration is switched off, the JVM can still evict cache entries when it is running low on available heap memory.

Set it to -1 to automatically derive cleanup delay from core.repositoryCacheExpireAfter (lowest value between 1/10 of core.repositoryCacheExpireAfter and 10 minutes).

Default is -1.

Time an unused repository should expire and be evicted from the repository cache.

Values can be specified using standard time unit abbreviations (ms, sec, min, etc.).

Default is 1 hour.

Use a per request (currently per request thread) ref cache. The ref cache uses JGit’s SnapshottingRefDirectory to ensure that packed refs are checked and potentially read at least once per request (lazily) if needed. This helps reduce the overhead of checking if the packed-refs file is outdated.

Default is true.

The list of submit requirement names that should be displayed as separate columns in the dashboard.

Commands that should be offered to download changes.

Multiple commands are supported:

If download.command is not specified, all download commands are offered.

Schemes that should be used to download changes.

Multiple schemes are supported:

If download.scheme is not specified, SSH, HTTP and Anonymous HTTP downloads are allowed.

Schemes that can be used to download changes, but will not be advertised in the UI. This can be any scheme that can be configured in download.scheme.

This is mostly useful in a deprecation scenario during a time where using a scheme is discouraged, but has to be supported until all clients have migrated to use a different scheme.

By default, no scheme will be hidden in the UI.

Whether the download commands should be adapted when the change refs are hidden.

Git has a configuration option to hide refs from the initial advertisement (uploadpack.hideRefs). This option can be used to hide the change refs from the client. As consequence fetching changes by change ref does not work anymore. However by setting uploadpack.allowTipSha1InWant to true fetching changes by commit ID is possible. If download.checkForHiddenChangeRefs is set to true the git download commands use the commit ID instead of the change ref when a project is configured like this.

Example git configuration on a project:

By default false.

Specifies which archive formats, if any, should be offered on the change screen and supported for git-upload-archive operation:

Determines if scheduled garbage collections and garbage collections triggered through Web-UI should run in aggressive mode or not. Aggressive garbage collections are more expensive but may lead to significantly smaller repositories.

Valid values are "true" and "false," default is "false".

The start time for running the git garbage collection.

The interval for running the git garbage collection.

Local filesystem directory holding all Git repositories that Gerrit knows about and can process changes for. A project entity in Gerrit maps to a local Git repository by creating the path string "${basePath}/${project_name}.git".

If relative, the path is resolved relative to '$site_path'.

Name of the permissions-only project defining global server access controls and settings. These are inherited into every other project managed by the running server. The name is relative to gerrit.basePath.

The persisted_projects cache must be flushed after this setting is changed.

Defaults to All-Projects if not set.

Name of the default branch to use on the project creation, if no other branches were specified in the input.

Defaults to refs/heads/master if not set.

Name of the project in which meta data of all users is stored. The name is relative to gerrit.basePath.

Defaults to All-Users if not set.

The default URL for Gerrit to be accessed through.

Typically this would be set to something like "http://review.example.com/" or "http://example.com:8080/gerrit/" so Gerrit can output links that point back to itself.

Setting this is highly recommended, as it is necessary for the upload code invoked by "git push" or "repo upload" to output hyperlinks to the newly uploaded changes.

Optional base URL for repositories available over the anonymous git protocol. For example, set this to git://mirror.example.com/base/ to have Gerrit display patch set download URLs in the UI. Gerrit automatically appends the project name onto the end of the URL.

By default unset, as the git daemon must be configured externally by the system administrator, and might not even be running on the same host as Gerrit.

Optional base URL for documentation, under which one can find "index.html", "rest-api.html", etc. Used as the base for the fixed set of links in the "Documentation" tab. A slash is implicitly appended. (For finer control over the top menu, consider writing a plugin.)

If unset or empty, the documentation tab will only be shown if /Documentation/index.html can be reached by the browser at app load time.

If enabled and server-side signed push validation is also enabled, enable the REST API endpoints and web UI for editing GPG keys. If disabled, GPG keys can only be added by administrators with direct git access to All-Users.

Defaults to true.

Optional command to install the commit-msg hook. Typically of the form:

By default unset; falls back to using scp from the canonical SSH host, or curl from the canonical HTTP URL for the server. Only necessary if a proxy or other server/network configuration prevents clients from fetching from the default location.

Optional base URL for repositories available over the HTTP protocol. For example, set this to http://mirror.example.com/base/ to have Gerrit display URLs from this server, rather than itself.

By default unset, as the HTTP daemon must be configured externally by the system administrator, and might not even be running on the same host as Gerrit.

Repeatable list of class name of additional Guice modules to load as override to the batchInjector’s modules during the init phases. Classes are resolved using the primary Gerrit class loader, hence the class needs to be either declared in Gerrit or an additional JAR located under the /lib directory.

By default unset.

Repeatable list of class name of additional Guice modules to load at Gerrit startup as part of the dbInjector. Classes are resolved using the primary Gerrit class loader, hence the class needs to be either declared in Gerrit or an additional JAR located under the /lib directory.

By default unset.

Class name of the Guice modules to load as alternate implementation for the Gerrit indexes backend. Classes are resolved using the primary Gerrit class loader, hence the class needs to be either declared in Gerrit or an additional JAR located under the /lib directory.

By default unset.

Example:

Repeatable list of class name of additional Guice modules to load at Gerrit startup as part of the sysInjector. Classes are resolved using the primary Gerrit class loader, hence the class needs to be either declared in Gerrit or an additional JAR located under the /lib directory.

By default unset.

Example:

Enable rendering of project list from the secondary index instead of purely relying on the in-memory cache.

By default false.

Name of the Weblink that should be chosen in cases where only one Weblink can be used in the UI, for example in inline links.

By default unset, meaning that the UI is responsible for trying to identify a weblink to be used in these cases, most likely weblinks that links to code browsers with known integrations with Gerrit (like Gitiles and Gitweb).

Example:

URL to direct users to when they need to report a bug.

By default unset, meaning no bug report URL will be displayed. Administrators should set this to the URL of their issue tracker, if necessary.

Use the secure store implementation from a specified class.

If specified, must be the fully qualified class name of a class that implements the com.google.gerrit.server.securestore.SecureStore interface, and the jar file containing the class must be placed in the $site_path/lib folder.

If not specified, the default no-op implementation is used.

For security reasons Gerrit will always jump out of iframe. Setting this option to true will prevent this behavior.

By default false.

Add X-Frame-Options header to all HTTP responses. The X-Frame-Options HTTP response header can be used to indicate whether or not a browser should be allowed to render a page in a <frame>, <iframe>, <embed> or <object>.

Available values:

Path prefix for Gerrit’s static resources if using a CDN.

Path for Gerrit’s favicon after default URL, including icon name and extension (.ico should be used).

Optional identifier for this Gerrit instance. Used to identify a specific instance within a group of Gerrit instances with the same serverId (i.e.: a Gerrit cluster). Unlike instanceName this value is not available in the email templates.

Short identifier for this Gerrit instance. A good name should be short but precise enough so that users can identify the instance among others.

Defaults to the full hostname of the Gerrit server.

Enable Gerrit rolling upgrade to the next version. For example if Gerrit v3.2 is version N (All-Projects:refs/meta/version=183) then its next version N+1 is v3.3 (All-Projects:refs/meta/version=184). Allow Gerrit to start even if the underlying schema version has been bumped to the next Gerrit version.

Set to true if Gerrit is installed in [high-availability configuration](https://gerrit.googlesource.com/plugins/high-availability/+/refs/heads/master/README.md) during the rolling upgrade to the next version.

By default false.

The rolling upgrade process, at high level, assumes that Gerrit is installed on two or more nodes sharing the repositories over NFS. The upgrade is composed of the following steps:

ServerId of the repositories imported from other Gerrit servers. Changes coming associated with the imported serverIds are indexed and displayed in the UI but they are not searchable by changeNumber therefore the index.cacheQueryResultsByChangeNum must also be set to false. Imported changes are still discoverable in any other ways, for example:

Specify multiple gerrit.importedServerId for allowing the import from multiple Gerrit servers with different serverIds.

If this value is not set, all changes imported from other Gerrit servers will be ignored.

By default empty.

Used by NoteDb to, amongst other things, identify author identities from per-server specific account IDs.

If this value is not set on startup it is automatically set to a random UUID.

Path to the locally installed gitweb.cgi executable. This CGI will be called by Gerrit Code Review when the URL /gitweb is accessed. Project level access controls are enforced prior to calling the CGI.

Defaults to /usr/lib/cgi-bin/gitweb.cgi if gitweb.url is not set.

Optional URL of an affiliated gitweb service. Defines the web location where a gitweb.cgi is installed to browse gerrit.basePath and the repositories it contains.

Gerrit appends any necessary query arguments onto the end of this URL. For example, ?p=$project.git;h=$commit.

Optional type of affiliated gitweb service. This allows using alternatives to gitweb, such as cgit.

Valid values are gitweb, cgit, disabled or custom.

If not set, or set to disabled, there is no gitweb hyperlinking support.

Optional pattern to use for constructing the gitweb URL when pointing at a specific commit when gitweb.type is set to custom.

Valid replacements are ${project} for the project name in Gerrit and ${commit} for the SHA-1 hash for the commit.

Optional pattern to use for constructing the gitweb URL when pointing at a specific project when gitweb.type is set to custom.

Valid replacements are ${project} for the project name in Gerrit.

Optional pattern to use for constructing the gitweb URL when pointing at a specific branch when gitweb.type is set to custom.

Valid replacements are ${project} for the project name in Gerrit and ${branch} for the name of the branch.

Optional pattern to use for constructing the gitweb URL when pointing at a specific tag when gitweb.type is set to custom.

Valid replacements are ${project} for the project name in Gerrit and ${tag} for the name of the tag.

Optional pattern to use for constructing the gitweb URL when pointing at the contents of the root tree in a specific commit when gitweb.type is set to custom.

Valid replacements are ${project} for the project name in Gerrit and ${commit} for the SHA-1 hash for the commit.

Optional pattern to use for constructing the gitweb URL when pointing at the contents of a file in a specific commit when gitweb.type is set to custom.

Valid replacements are ${project} for the project name in Gerrit, ${file} for the file name, ${hash} for the SHA-1 hash for the commit, and ${commit} for the change ref or SHA-1 of the commit if no base patch set.

Optional pattern to use for constructing the gitweb URL when pointing at the history of a file in a specific branch when when gitweb.type is set to custom.

Valid replacements are ${project} for the project name in Gerrit, ${file} for the file name and ${branch} for the name of the branch.

Optional setting for modifying the link name presented to the user in the Gerrit web-UI.

The default linkname for custom type is gitweb.

Optional character to substitute the standard path separator (slash) in project names and branch names.

By default, Gerrit will use hexadecimal encoding for slashes in project and branch names. Some web servers, such as Tomcat, reject this hexadecimal encoding in the URL.

Some alternative gitweb services, such as Gitblit, allow using an alternative path separator character. In Gitblit, this can be configured through the property web.forwardSlashCharacter. In Gerrit, the alternative path separator can be configured correspondingly using the property gitweb.pathSeparator.

Valid values are the characters *, ( and ).

Whether or not Gerrit should encode the generated viewer URL.

Gerrit composes the viewer URL using information about the project, branch, file or commit of the target object to be displayed. Typically viewers such as CGit and gitweb do need those parts to be encoded, including the / in project’s name, for being correctly parsed. However other viewers could instead require an unencoded URL (e.g. GitHub web based viewer).

Valid values are true and false. The default is true.

Controls whether AuditLogReader should ignore commits created by unidentified users. If true, then AuditLogReader ignores commits in the refs/groups/* made by unidentified users (i.e. when the author of a commit can’t be parsed as account id).

The current version of Gerrit writes identified users as authors for new refs/groups/* commits. However, some old versions used a server identity as the author (e.g. "Gerrit Code Review <server@googlesource.com>") for such commits. Such string can’t be converted to account id but usually the commit shouldn’t be ignored.

By default, false.

Setting it to true may lead to some unexpected results in audit log and must be set carefully.

Controls whether external users (these are users we have sufficient knowledge about but who don’t yet have a Gerrit account) are considered to be members of the REGISTERED_USERS group.

This setting only makes sense if you run custom code (e.g. from a plugin or a custom authentication backend). By default, Gerrit core always requires users to register and doesn’t use external users.

By default, true.

Controls whether newly created groups should be by default visible to all registered users.

By default, false.

Display name for group with the given UUID.

This option is only supported for system groups (scheme 'global').

E.g. this parameter can be used to configure another name for the Anonymous Users group:

When setting this parameter it should be verified that there is no existing group with the same name (case-insensitive). Configuring an ambiguous name makes Gerrit fail on startup. Once set Gerrit ensures that it is not possible to create a group with this name. Gerrit also keeps the default name reserved so that it cannot be used for new groups either. This means there is no danger of ambiguous group names when this parameter is removed and the system group uses the default name again.

UUID of an external group that should always be considered as relevant when checking whether an account is visible.

This setting is only relevant for external group backends and only if the account visibility is set to SAME_GROUP or VISIBLE_GROUP.

If the account visibility is set to SAME_GROUP or VISIBLE_GROUP users should see all accounts that are a member of a group that contains themselves or that is visible to them. Checking this would require getting all groups of the current user and all groups of the accounts for which the visibility is being checked, but since getting all groups that a user is a member of is expensive for external group backends Gerrit doesn’t query these groups but instead guesses the relevant groups. Guessing relevant groups limits the inspected groups to all groups that are mentioned in the ACLs of the projects that are currently cached (i.e. all groups that are listed in the groups files of the cached projects). This is not very reliable since it depends on which groups are mentioned in the ACLs and which projects are currently cached. To make this more reliable this configuration parameter allows to configure external groups that should always be considered as relevant.

As said this setting is only relevant for external group backends. In Gerrit core this is only the LDAP backend, but it may apply to further group backends that are added by plugins.

This parameter may be added multiple times to specify multiple relevant groups.

URL of the proxy server when making outgoing HTTP connections for OpenID login transactions. Syntax should be http://’hostname':’port'.

Optional username to authenticate to the HTTP proxy with. This property is honored only if the username does not appear in the http.proxy property above.

Optional password to authenticate to the HTTP proxy with. This property is honored only if the password does not appear in the http.proxy property above.

If true, 'User' attribute will be added to the request attributes so it can be accessed outside the request scope (will be set to username or id if username not configured).

This attribute can be used by the servlet container to log user in the http access log.

When running the embedded servlet container, this attribute is used to print user in the httpd_log.

Default value is true.

If true, the header 'User' will be added to the list of response headers so it can be accessed from a reverse proxy for logging purposes.

Default value is false.

Configuration for the listening sockets of the internal HTTP daemon. Each entry of listenUrl combines the following options for a listening socket: protocol, network address, port and context path.

Protocol can be either http://, https://, proxy-http:// or proxy-https://. The latter two are special forms of http:// with awareness of a reverse proxy (see below). Network address selects the interface and/or scope of the listening socket. For notes examples, see below. Port is the TCP port number and is optional (default value depends on the protocol). Context path is the optional "base URI" for the Gerrit Code Review as application to serve on.

Protocol schemes:

If true, permits the daemon to bind to the port even if the port is already in use. If false, the daemon ensures the port is not in use before starting. Busy sites may need to set this to true to permit fast restarts.

By default, true.

Set a graceful stop time. If set, the daemon ensures that all incoming calls are preserved for a maximum period of time, before starting the graceful shutdown process. Sites behind a workload balancer such as HAProxy would need this to be set for avoiding serving errors during rolling restarts.

Values should use common unit suffixes to express their setting:

If true, permits the daemon to inherit its server socket channel from fd0/1(stdin/stdout). When set to true, the server can be socket activated via systemd or xinetd.

By default, false.

Size, in bytes, of the buffer used to parse the HTTP headers of an incoming HTTP request. The entire request headers, including any cookies sent by the browser, must fit within this buffer, otherwise the server aborts with the response '413 Request Entity Too Large'.

One buffer of this size is allocated per active connection. Allocating a buffer that is too large wastes memory that cannot be reclaimed, allocating a buffer that is too small may cause unexpected errors caused by very long Referer URLs or large cookie values.

By default, 16384 (16 K), which is sufficient for most OpenID and other web-based single-sign-on integrations.

Path of the certificate revocation list file in PEM format. This crl file is optional, and available for CLIENT_SSL_CERT_LDAP authentication.

To create and view a crl using openssl:

If not absolute, the path is resolved relative to $site_path.

By default, $site_path/etc/crl.pem.

Path of the Java keystore containing the server’s SSL certificate and private key. This keystore is required for https:// in URL.

To create a self-signed certificate for simple internal usage:

If not absolute, the path is resolved relative to $site_path.

By default, $site_path/etc/keystore.

Password used to decrypt the private portion of the sslKeyStore. Java keystores require a password, even if the administrator doesn’t want to enable one.

If set to the empty string the embedded server will prompt for the password during startup.

By default, gerrit.

Enable (or disable) the '$site_path'/logs/httpd_log request log. If enabled, an NCSA combined log format request log file is written out by the internal HTTP daemon. The httpd log format is documented here.

log4j.appender with the name httpd_log can be configured to overwrite programmatic configuration.

By default, true if httpd.listenUrl uses http:// or https://, and false if httpd.listenUrl uses proxy-http:// or proxy-https://.

Number of worker threads dedicated to accepting new incoming TCP connections and allocating them connection-specific resources.

By default, 2, which should be suitable for most high-traffic sites.

Minimum number of spare threads to keep in the worker thread pool. This number must be at least 1 larger than httpd.acceptorThreads multiplied by the number of httpd.listenUrls configured.

By default, 5, suitable for most lower-volume traffic sites.

Maximum number of threads to permit in the worker thread pool.

By default 25, suitable for most lower-volume traffic sites.

Maximum number of client connections which can enter the worker thread pool waiting for a worker thread to become available. 0 sets the queue size to the Integer.MAX_VALUE.

By default 200.

Maximum amount of time a client will wait for an available thread to handle a project clone, fetch or push request over the smart HTTP transport.

Values should use common unit suffixes to express their setting:

Class that implements the javax.servlet.Filter interface for filtering any HTTP related traffic going through the Gerrit HTTP protocol. Class is loaded and configured in the Gerrit Jetty container and run in front of all Gerrit URL handlers, allowing the filter to inspect, modify, allow or reject each request. It needs to be provided as JAR library under $GERRIT_SITE/lib as it is resolved using the default Gerrit class loader and cannot be dynamically loaded by a plugin.

Failing to load the Filter class would result in a Gerrit start-up failure, as this class is supposed to provide mandatory filtering in front of Gerrit HTTP protocol.

Typical usage is in conjunction with the auth.type=HTTP as replacement of an Apache HTTP proxy layer as security enforcement on top of Gerrit by returning a trusted username as HTTP Header.

Allow multiple values to install multiple servlet filters.

Example of using a security library secure.jar under $GERRIT_SITE/lib that provides a org.anyorg.MySecureHeaderFilter Servlet Filter that enforces a trusted username in the TRUSTED_USER HTTP Header and org.anyorg.MySecureIPFilter that performs source IP security filtering:

Gerrit supports customized pluggable HTTP filters as filterClass. This option allows to pass extra initialization parameters to the filter. It allows for multiple key/value pairs to be passed in this pattern:

For a comprehensive example:

Maximum idle time for a connection, which roughly translates to the TCP socket SO_TIMEOUT.

This value is interpreted as the maximum time between some progress being made on the connection. So if a single byte is read or written, then the timeout is reset.

The max idle time is applied:

By default, 30 seconds.

Location of an external robots.txt file to be used instead of the one bundled with the .war of the application.

If not absolute, the path is resolved relative to $site_path.

If the file doesn’t exist or can’t be read the default robots.txt file bundled with the .war will be used instead.

Enable (or disable) registration of Jetty MBeans for Java JMX.

By default, false.

(DEPRECATED) The only supported value is LUCENE, which is the default, that means a Lucene index is used.

For using other indexing backends (e.g. ElasticSearch), refer to gerrit.installIndexModule setting.

Number of threads to use for indexing in normal interactive operations. Setting it to 0 disables the dedicated thread pool and indexing will be done in the same thread as the operation.

If not set or set to a zero, defaults to the number of logical CPUs as returned by the JVM. If set to a negative value, defaults to a direct executor.

Number of threads to use for indexing in background operations, such as online schema upgrades, and also the default for offline reindexing.

If not set or set to a zero, defaults to the number of logical CPUs as returned by the JVM. If set to a negative value, defaults to a direct executor.

Allow to cache and reuse the change JSON elements by their Change number. This improves the performance of queries that are returning Changes duplicates. It needs to be turned off when having Changes imported from other servers because of the potential conflicts of change numbers.

Defaults to true.

Whether to upgrade to new index schema versions while the server is running. This is recommended as it prevents additional downtime during Gerrit version upgrades (avoiding the need for an offline reindex step using Reindex), but can add additional server load during the upgrade.

If set to false, there is no way to upgrade the index schema to take advantage of new search features without restarting the server.

Defaults to true.

A list of projects that will be excluded from reindexing. This can be used to exclude projects which are expensive to reindex to prioritize the other projects.

Excluded projects can later be reindexed by for example using the index changes in project command.

The pagination type to use when index queries are repeated to obtain the next set of results. Supported values are:

Default limit, if the user does not provide a limit. If this is not set or set to 0, then index queries are executed with the maximum permitted limit for the user, which may be really high and cause too much load on the index. Thus setting this default limit to something smaller like 100 allows you to control the load, while not taking away any permission from the user. If the user provides a limit themselves, then defaultLimit is ignored.

Maximum limit to allow for search queries. Requesting results above this limit will truncate the list (but will still set _more_changes on result lists). Set to 0 for no limit.

When index.type is set to LUCENE, defaults to no limit.

Maximum number of pages of search results to allow, as index implementations may have to scan through large numbers of skipped results when searching with an offset. Requesting results starting past this threshold times the requested limit will result in an error. Set to 0 for no limit.

Defaults to no limit.

When index queries are repeated to obtain more results, this multiplier will be used to determine the limit for the next query. Using a page multiplier allows queries to start off small and thus provide good latency for queries which may end up only having very few results, and then scaling up to have better throughput to handle queries with larger result sets without incurring the overhead of making as many queries as would be required with a smaller limit. This strategy of using a multiplier attempts to create a balance between latency and throughput by dynamically adjusting the query size to the number of results being returned by each query in the pagination.

The larger the multiplier, the better the throughput on large queries, and it also improves latency on large queries by scaling up quickly. However, a larger multiplier can hurt latencies a bit by making the "last" query in a series longer than needed. The impact of this depends on how much the backend latency goes up when specifying a large limit and few results are returned. Setting index.maxPageSize that isn’t too large, can likely help reduce the impacts of this.

For example, if the limit of the previous query was 500 and pageSizeMultiplier is configured to 5, the next query will have a limit of 2500.

Note: ignored when paginationType is `NONE`

Defaults to 1 which effectively turns this feature off.

Maximum size to allow when index queries are repeated to obtain more results. Note that, index.maxLimit will be used to limit page size if it is configured to a value lower than maxPageSize.

For example, if the limit of previous query was 500, pageSizeMultiplier is configured to 5 and maxPageSize to 2000, the next query will have a limit of 2000 (instead of 2500).

Note: ignored when paginationType is `NONE`

Defaults to no limit.

Maximum number of leaf terms to allow in a query. Too-large queries may perform poorly, so setting this option causes query parsing to fail fast before attempting to send them to the secondary index.

When the index type is LUCENE, also sets the maximum number of clauses permitted per BooleanQuery. This is so that all enforced query limits are the same.

Defaults to 1024.

Whether to automatically check if a document became stale in the index immediately after indexing it. If false, there is a race condition during two simultaneous writes that may cause one of the writes to not be reflected in the index. The check to avoid this does consume some resources.

Defaults to false.

On BatchUpdate, do not await indexing completion before returning the request to the user (WEB_BROWSER requests only). This has an advantage of faster UI (because indexing latency does not contribute to the write request latency) and disadvantage that the indexing result might not be immediately available after the write request.

Defaults to false.

List of options that Gerrit applies when rendering the payload of an internal event. This is the same set of options that are documented here.

Depending on the setup, these events might get serialized using stream events.

This can be set to the set of minimal options that consumers of Gerrit’s events need. A minimal set would be (SKIP_DIFFSTAT).

Every option that gets added here will have a performance impact. The general recommendation is therefore to set this to a minimal set of required options.

Defaults to all available options minus CHANGE_ACTIONS, CURRENT_ACTIONS and CHECK. This is a rich default to make sure the config is backwards compatible with what the default was before the config was added.

Add patch set level comment as event comment. Without this option, patch set level comment will not be included in the event comment attribute. Given that currently patch set level, file and robot comments are not exposed in the comment-added event type, those comments will be lost. One particular use case is to re-trigger CI build from the change screen by adding a comment with specific content, e.g.: recheck. Jenkins Gerrit Trigger plugin and Zuul CI depend on this feature to trigger change verification.

By default, true.

Enable streaming of ref-updated event which represents a single ref update operation. Batch ref updates are represented as a series of ref-updated events. This allows event listeners to react on a ref update. Please consider switching to batch-ref-updated event which provides better control on grouping and preserving order of the ref updates.

By default, true.

Enable streaming of batch-ref-updated event which represents group of refs updated during a single batch ref update operation. Single ref updates are also streamed as a batch-ref-updated events with a single ref specified. This allows event listeners to react on all ref updated events and disable individual ref-updated events by setting event.stream-events.enableRefUpdatedEvents to false.

By default, false.

Enable streaming of ref-updated events for refs/draft-comments refs. Enable this flag in case listeners in your system are supposed to react on draft operations.

By default, false.

List of experiments that are currently enabled. The release notes contain currently available experiments.

We will not remove experiments in stable patch releases. They are likely to be removed in the next stable version.

List of experiments that are currently disabled. The release notes contain currently available experiments. This list disables experiments with the given key that are either enabled by default or explicitly in the config.

Filter the groups found in LDAP by guessing the ones relevant to Gerrit and removing the others from list completions and ACL evaluations. The guess is based on two elements: the projects most recently accessed in the cache and the list of LDAP groups included in their ACLs.

Please note that projects rarely used and thus not cached may be temporarily inaccessible by users even with LDAP membership and grants referenced in the ACLs.

By default, true.

URL of the organization’s LDAP server to query for user information and group membership from. Must be of the form ldap://host or ldaps://host to bind with either a plaintext or SSL connection.

If auth.type is LDAP this setting should use ldaps:// to ensure the end user’s plaintext password is transmitted only over an encrypted connection.

If you want to configure multiple ldap servers you can try to put multiple ldap urls separated by a space: server = ldaps://ldap1 ldaps://ldap2 See issue 40010644.

If true, Gerrit will perform StartTLS extended operation.

By default, false, StartTLS will not be enabled.

If false, Gerrit will provide credentials only at connection open, this is required for some LDAP implementations that do not allow anonymous bind for StartTLS or for reauthentication.

By default, true.

If false and ldap.server is an ldaps:// style URL or ldap.startTls is true, Gerrit will not verify the server certificate when it connects to perform a query.

By default, true, requiring the certificate to be verified.

If true, LDAP groups are visible to all registered users.

By default, false, LDAP groups are visible only to administrators and group members.

(Optional) Username to bind to the LDAP server with. If not set, an anonymous connection to the LDAP server is attempted.

(Optional) Password for the user identified by ldap.username. If not set, an anonymous (or passwordless) connection to the LDAP server is attempted.

(Optional) How an LDAP referral should be handled if it is encountered during directory traversal. Set to follow to automatically follow any referrals, or ignore to ignore the referrals.

By default, ignore.

(Optional) The read timeout for an LDAP operation. The value is in the usual time-unit format like "1 s", "100 ms", etc…​ A timeout can be used to avoid blocking all of the SSH command start threads in case the LDAP server becomes slow.

By default there is no timeout and Gerrit will wait for the LDAP server to respond until the TCP connection times out.

Root of the tree containing all user accounts. This is typically of the form ou=people,dc=example,dc=com.

This setting may be added multiple times to specify more than one root.

Scope of the search performed for accounts. Must be one of:

Default is subtree as many directories have several levels.

Query pattern to use when searching for a user account. This may be any valid LDAP query expression, including the standard (&…​) and (|…​) operators. If auth.type is HTTP_LDAP then the variable ${username} is replaced with a parameter set to the username that was supplied by the HTTP server. If auth.type is LDAP then the variable ${username} is replaced by the string entered by the end user.

This pattern is used to search the objects contained directly under the ldap.accountBase tree. A typical setting for this parameter is (uid=${username}) or (cn=${username}), but the proper setting depends on the LDAP schema used by the directory server.

Default is (uid=${username}) for FreeIPA and RFC 2307 servers, and (&(objectClass=user)(sAMAccountName=${username})) for Active Directory.

(Optional) Name of an attribute on the user account object which contains the initial value for the user’s full name field in Gerrit. Typically this is the displayName property in LDAP, but could also be legalName or cn.

Attribute values may be concatenated with literal strings. For example to join given name and surname together, use the pattern ${givenName} ${SN}.

Default is displayName for FreeIPA and RFC 2307 servers, and ${givenName} ${sn} for Active Directory.

A non-empty or default value prevents users from modifying their full name field. To allow edits to the full name field, set to the empty string.

(Optional) Name of an attribute on the user account object which contains the user’s Internet email address, as defined by this LDAP server.

Attribute values may be concatenated with literal strings, for example to set the email address to the lowercase form of sAMAccountName followed by a constant domain name, use ${sAMAccountName.toLowerCase}@example.com.

If set, the preferred email address will be prefilled from LDAP, but users may still be able to register additional email addresses, and select a different preferred email address.

Default is mail.

(Optional) Name of an attribute on the user account object which contains the initial value for the user’s SSH username field in Gerrit. Typically this is the uid property in LDAP, but could also be cn. Administrators should prefer to match the attribute corresponding to the user’s workstation username, as this is what SSH clients will default to.

Attribute values may also be forced to lowercase, or to uppercase in an expression. For example, ${sAMAccountName.toLowerCase} will force the value of sAMAccountName, if defined, to be all lowercase. The suffix .toUpperCase can be used for the other direction. The suffix .localPart can be used to split attribute values of the form 'user@example.com' and return only the left hand side, for example ${userPrincipalName.localPart} would provide only 'user'.

If set, users will be unable to modify their SSH username field, as Gerrit will populate it only from the LDAP data. Note that once the username has been set it cannot be changed, therefore it is recommended not to make changes to this setting that would cause the value to differ, as this will prevent users from logging in.

Default is uid for FreeIPA and RFC 2307 servers, and ${sAMAccountName.toLowerCase} for Active Directory.

(Optional) Name of an attribute on the user account object which contains the groups the user is part of. Typically used for Active Directory and FreeIPA servers.

Default is unset for RFC 2307 servers (disabled) and memberOf for Active Directory and FreeIPA.

(Optional) Whether to expand nested groups recursively. This setting is used only if ldap.accountMemberField is set.

Default is unset for FreeIPA and true for RFC 2307 servers and Active Directory.

(Optional) Whether to fetch the memberOf account attribute on login. Setups which use LDAP for user authentication but don’t make use of the LDAP groups may benefit from setting this option to false as this will result in a much faster LDAP login.

Default is unset for RFC 2307 servers (disabled) and true for Active Directory and FreeIPA.

Root of the tree containing all group objects. This is typically of the form ou=groups,dc=example,dc=com.

This setting may be added multiple times to specify more than one root.

Scope of the search performed for group objects. Must be one of:

Default is subtree as many directories have several levels.

Query pattern used when searching for an LDAP group to connect to a Gerrit group. This may be any valid LDAP query expression, including the standard (&…​) and (|…​) operators. The variable ${groupname} is replaced with the search term supplied by the group owner.

Default is (cn=${groupname}) for FreeIPA and RFC 2307 servers, and (&(objectClass=group)(cn=${groupname})) for Active Directory.

Query pattern to use when searching for the groups that a user account is currently a member of. This may be any valid LDAP query expression, including the standard (&…​) and (|…​) operators.

If auth.type is HTTP_LDAP then the variable ${username} is replaced with a parameter set to the username that was supplied by the HTTP server. Other variables appearing in the pattern, such as ${fooBarAttribute}, are replaced with the value of the corresponding attribute (in this case, fooBarAttribute) as read from the user’s account object matched under ldap.accountBase. Attributes such as ${dn} or ${uidNumber} may be useful.

Default is (|(memberUid=${username})(gidNumber=${gidNumber})) for RFC 2307, and unset (disabled) for Active Directory and FreeIPA.

(Optional) Name of the attribute on the group object which contains the value to use as the group name in Gerrit.

Typically the attribute name is cn for RFC 2307 and Active Directory servers. For other servers the attribute name may differ, for example apple-group-realname on Apple MacOS X Server.

It is also possible to specify a literal string containing a pattern of attribute values. For example to create a Gerrit group name consisting of LDAP group name and group ID, use the pattern ${cn} (${gidNumber}).

Default is cn.

All users must be a member of this group to allow account creation or authentication.

For example, setting to ldap/gerritaccess limits account creation or authentication to members of the ldap group gerritaccess.

Setting mandatoryGroup implies enabling of ldap.fetchMemberOfEagerly

By default, unset.

Converts the local username, that is used to login into the Gerrit Web UI, to lower case before doing the LDAP authentication. By setting this parameter to true, a case insensitive login to the Gerrit Web UI can be achieved.

If set, it must be ensured that the local usernames for all existing accounts are converted to lower case, otherwise a user that has a local username that contains upper case characters will not be able to login anymore. The local usernames for the existing accounts can be converted to lower case by running the server program LocalUsernamesToLowerCase. Please be aware that the conversion of the local usernames to lower case can’t be undone. For newly created accounts the local username will be directly stored in lower case.

By default, unset/false.

Defines how Gerrit authenticates with the server. When set to GSSAPI Gerrit will use Kerberos. To use kerberos the java.security.auth.login.config system property must point to a login to a JAAS configuration file and, if Java 6 is used, the system property java.security.krb5.conf must point to the appropriate krb5.ini file with references to the KDC.

(Optional) Enable the LDAP connection pooling or not.

If it is true, the LDAP service provider maintains a pool of (possibly) previously used connections and assigns them to a Context instance as needed. When a Context instance is done with a connection (closed or garbage collected), the connection is returned to the pool for future use.

For details, see LDAP connection management (Pool) and LDAP connection management (Configuration)

By default, false.

(Optional) Timeout period for establishment of an LDAP connection.

The value is in the usual time-unit format like "1 s", "100 ms", etc…​

By default there is no timeout and Gerrit will wait indefinitely.

The name of a plugin which serves the LFS protocol on the <project-name>/info/lfs/objects/batch endpoint. When not configured Gerrit will respond with 501 Not Implemented on LFS protocol requests.

By default unset.

If set to true, enables error, ssh and http logging in JSON format (file names: logs/error_log.json, logs/sshd_log.json and logs/httpd_log.json).

The option only applies to Gerrit built-in loggers. It is ignored when a log4j configuration is specified via container.javaOptions, for example -Dlog4j.configuration=file://etc/log4j.properties.

Defaults to false.

If set to true, enables error logging in regular plain text format. Can only be disabled if jsonLogging is enabled.

The option only applies to Gerrit built-in loggers. It is ignored when a log4j configuration is specified via container.javaOptions, for example -Dlog4j.configuration=file://etc/log4j.properties.

Defaults to true.

If set to true, log files are compressed at server startup and then daily at 11pm (in the server’s local time zone).

Defaults to true.

If set to true, log files are rotated daily at midnight (GMT).

Defaults to true.

The type of data reservoir used by the metrics system to calculate the percentile values for timers and histograms. It can be set to one of the following values:

The exponential decay factor; the higher this is, the more biased the reservoir will be towards newer values.

The number of samples to keep in the reservoir. Applies to all reservoir types except the sliding time-based ones.

Defaults to 1028.

The window of time for keeping data in the reservoir. It only applies to sliding time-based reservoir types.

If set to true, files with the MIME type <name> will be sent as direct downloads to the user’s browser, rather than being wrapped up inside of zipped archives. The type name may be a complete type name, e.g. image/gif, a generic media type, e.g. image/*, or the wildcard */* to match all types.

By default, false for all MIME types.

The next available account sequence number is stored as UTF-8 text in a blob pointed to by the refs/sequences/accounts ref in the All-Users repository. Multiple processes share the same sequence by incrementing the counter using normal git ref updates. To amortize the cost of these ref updates, processes increment the counter by a larger number and hand out numbers from that range in memory until they run out. This configuration parameter controls the size of the account ID batch that each process retrieves at once.

By default, 1.

The next available change sequence number is stored as UTF-8 text in a blob pointed to by the refs/sequences/changes ref in the All-Projects repository. Multiple processes share the same sequence by incrementing the counter using normal git ref updates. To amortize the cost of these ref updates, processes increment the counter by a larger number and hand out numbers from that range in memory until they run out. This configuration parameter controls the size of the change ID batch that each process retrieves at once.

By default, 20.

If true, the full name can be edited in the contact information.

Default is false.

If true, additional email addresses can be registered in the contact information.

Default is false.

If true, delta compression between objects is enabled. This may result in a smaller overall transfer for the client, but requires more server memory and CPU time.

False (off) by default, matching Gerrit Code Review 2.1.4.

Maximum number of threads to use for delta compression (if enabled). This is per-client request. If set to 0 then the number of CPUs is auto-detected and one thread per CPU is used, per client request.

By default, 1.

How often plugins should be examined for new plugins to load, removed plugins to be unloaded, or updated plugins to be reloaded. Values can be specified using standard time unit abbreviations ('ms', 'sec', 'min', etc.).

If set to 0, automatic plugin reloading is disabled. Administrators may force reloading with gerrit plugin reload.

Default is 1 minute.

Enable remote installation, enable and disable of plugins over HTTP and SSH. If set to true Administrators can install new plugins remotely, or disable existing plugins. Defaults to false.

List of mandatory plugins. If a plugin from this list does not load, Gerrit will fail to start.

Disabling and restarting of a mandatory plugin is rejected, but reloading of a mandatory plugin is still possible.

Set the timeout value for loading JavaScript plugins in Gerrit UI. Values can be specified using standard time unit abbreviations ('ms', 'sec', 'min', etc.).

Default is 5 seconds. Negative values will be converted to 0.

Additional push options which should be accepted by gerrit as valid options even if they are not registered by any plugin(e.g. "myplugin~foo").

This config can be used when gerrit migrates from a deprecated plugin to the new one. The new plugin can (temporary) accept push options of the old plugin without registering such options.

Name of the groups of users that are allowed to execute 'receive-pack' on the server. One or more groups can be set.

If no groups are added, any user will be allowed to execute 'receive-pack' on the server.

If set to a non-empty value and server-side signed push validation is enabled, use this value as the seed to the HMAC SHA-1 nonce generator. If unset, a 64-byte random seed will be generated at server startup.

As this is used as the seed of a cryptographic algorithm, it is recommended to be placed in secure.config.

Defaults to unset.

When validating the nonce passed as part of the signed push protocol, accept valid nonces up to this many seconds old. This allows certificate verification to work over HTTP where there is a lag between the HTTP response providing the nonce to sign and the next request containing the signed nonce. This can be significant on large repositories, since the lag also includes the time to count objects on the client.

Default is 5 minutes.

If true, Gerrit will verify the destination repository has no references under the magic 'refs/for' branch namespace. Names under these locations confuse clients when trying to upload code reviews so Gerrit requires them to be empty.

If false Gerrit skips the sanity check and assumes administrators have ensured the repository does not contain any magic references. Setting to false to skip the check can decrease latency during push.

Default is true.

If true, Gerrit will allow project owners to change the parent of a project.

By default only Gerrit administrators are allowed to change the parent of a project. By allowing project owners to change parents, it may allow the owner to circumvent certain enforced rules (like important BLOCK rules).

Default is false.

This value supports configuration reloads: reload-config

If set to true, Gerrit will validate that all referenced objects that are not included in the received pack are reachable by the user.

Carrying out this check on gits with many refs and commits can be a very CPU-heavy operation. For non public Gerrit-servers this check may be overkill.

Only disable this check if you trust the clients not to forge SHA-1 references to access commits intended to be hidden from the user.

Default is true.

If true, Gerrit will cache all refs advertised during push in memory and base later receive operations on that cache.

Turning this cache off is considered experimental.

This cache provides value when the ref database is slow and/or does not offer an inverse lookup of object ID to ref name. When RefTable is used, this cache can be turned off (experimental) to get speed improvements.

Default is true.

If true, server-side signed push validation is enabled.

When a client pushes with git push --signed, this ensures that the push certificate is valid and signed with a valid public key stored in the refs/meta/gpg-keys branch of All-Users.

Defaults to false.

The maximum number of changes that Gerrit allows to be pushed in a batch for review. When this number is exceeded Gerrit rejects the push with an error message.

May be overridden for certain groups by specifying a limit in the 'Batch Changes Limit' global capability.

This setting can be used to prevent users from uploading large number of changes for review by mistake.

Default is zero, no limit.

The maximum number of commits that Gerrit allows to be pushed in a batch directly to a branch when bypassing review. This limit can be bypassed if a user skips validation.

Default is 10000.

Maximum allowed Git object size that 'receive-pack' will accept. If an object is larger than the given size the pack-parsing will abort and the push operation will fail. If set to zero then there is no limit.

Gerrit administrators can use this setting to prevent developers from pushing objects which are too large to Gerrit.

This setting can also be set in the project.config (receive.maxObjectSizeLimit) in order to further reduce the global setting. The project specific setting is only honored when it further reduces the global limit.

Default is zero.

Common unit suffixes of 'k', 'm', or 'g' are supported.

Controls whether the project-level receive.maxObjectSizeLimit value is inherited from the parent project. When true, the value is inherited, otherwise it is not inherited.

Default is false, the value is not inherited.

If signed push validation is enabled, set to the maximum depth to search when checking if a key is trusted.

Default is 0, meaning only explicitly trusted keys are allowed.

Maximum size of the thread pool in which the change data in received packs is processed.

Defaults to the number of available CPUs according to the Java runtime.

Overall timeout on the time taken to process the change data in received packs. Only includes the time processing Gerrit changes and updating references, not the time to index the pack. Values can be specified using standard time unit abbreviations ('ms', 'sec', 'min', etc.).

After the timeout is exceeded the task processing the receive gets a cancellation signal that allows the tast to finish gracefully. receive.cancellationTimeout defines how much time the task has to react to the cancellation signal before it is focefully cancelled.

The receive timeout cannot be overriden by setting a higher deadline on the git push request.

Default is 4 minutes. If no unit is specified, milliseconds is assumed.

Defines the time that a receive task has to react to a cancellation signal and finish gracefully after receive.timeout is exceeded. If the receive task is still not terminated after the cancellation timeout is exceeded the task is forcefully cancelled. Values can be specified using standard time unit abbreviations ('ms', 'sec', 'min', etc.).

Default is 5 seconds. If no unit is specified, milliseconds is assumed.

List of GPG key fingerprints that should be considered trust roots by the server when signed push validation is enabled. A key is trusted by the server if it is either in this list, or a path of trust signatures leads from the key to a configured trust root. The maximum length of the path is determined by receive.maxTrustDepth.

Key fingerprints can be displayed with gpg --list-keys --with-fingerprint.

Trust signatures can be added to a key using the tsign command to gpg --edit-key, after which the signed key should be re-uploaded.

If no keys are specified, web-of-trust checks are disabled. This is the default behavior.

Enables a Link footer to be used as an alternative change ID footer.

In some projects it may be desirable for the footer to contain a link to the Gerrit review page so that it is convenient to access the review page starting from the commit message. The Link footer is a standard footer used for inserting links in the commit message (e.g. used by the Linux kernel).

This option makes Gerrit interoperate well with Link footers. If change ID Link footers are enabled Gerrit recognizes footers of the form:

Example:

Alternate to gerrit.basePath. The repository will be created and used from this location instead: ${alternateBasePath}/${projectName}.git.

If configuring the basePath for an existing project in gerrit, make sure to stop gerrit, move the repository in the alternate basePath, configure basePath for this repository and then start Gerrit.

Path must be absolute.

The default submit type for newly created projects. Supported values are INHERIT, MERGE_IF_NECESSARY, FAST_FORWARD_ONLY, REBASE_IF_NECESSARY, REBASE_ALWAYS, MERGE_ALWAYS and CHERRY_PICK.

For more details see Submit Types.

Default is INHERIT.

This submit type is only applied at project creation time if a submit type is omitted from the ProjectInput. If the submit type is unset in the project config at runtime, for backwards compatibility purposes, it defaults to MERGE_IF_NECESSARY rather than INHERIT.

A name of a group which exists. Zero, one or many groups are allowed. Each on its own line. Groups which don’t exist are ignored.

Maximum time to wait between attempts to retry an operations when one attempt fails (e.g. on NoteDb updates due to contention, aka lock failure, on the underlying ref storage). Operations are retried with exponential backoff, plus some random jitter, until the interval reaches this limit. After that, retries continue to occur after a fixed timeout (plus jitter), up to retry.timeout.

Defaults to 5 seconds; unit suffixes are supported, and assumes milliseconds if not specified.

Total timeout for retrying operations when one attempt fails.

It is possible to overwrite this default timeout based on operation types by setting retry.<operationType>.timeout.

Defaults to 20 seconds; unit suffixes are supported, and assumes milliseconds if not specified.

Total timeout for retrying operations of type <operationType> when one attempt fails. <operationType> can be ACCOUNT_UPDATE, CHANGE_UPDATE, GROUP_UPDATE and INDEX_QUERY.

Defaults to retry.timeout; unit suffixes are supported, and assumes milliseconds if not specified.

Whether Gerrit should automatically retry operations on failure with tracing enabled. The automatically generated traces can help with debugging.

By default this is set to false.

If true, Gerrit will load and execute 'rules.pl' files in each project’s refs/meta/config branch, if present. When set to false, only the default internal rules will be used.

Default is true, to execute project specific rules.

Maximum number of Prolog reductions that can be performed when evaluating rules for a single change. Each function call made in user rule code, internal Gerrit Prolog code, or the Prolog interpreter counts against this limit.

Sites using very complex rules that need many reductions should compile Prolog to Java bytecode with rulec. This eliminates the dynamic Prolog interpreter from charging its own reductions against the limit, enabling more logic to execute within the same bounds.

A reductionLimit of 0 is nearly infinite, implemented by setting the internal limit to 2^31-1.

Default is 100,000 reductions (about 14 ms on Intel Core i7 CPU).

Maximum number of Prolog reductions that can be performed when compiling source code to internal Prolog machine code.

Default is 10x reductionLimit (1,000,000).

Maximum input size (in bytes) of a Prolog rules.pl file. Larger source files may need a larger rules.compileReductionLimit. Consider using rulec to precompile larger rule files.

A size of 0 bytes disables rules, same as rules.enable = false.

Common unit suffixes of 'k', 'm', or 'g' are supported.

Default is 128 KiB.

Number of predicate clauses allowed to be defined in the Prolog database by project rules. Very complex rules may need more than the default 256 limit, but cost more memory and may need more time to evaluate. Consider using rulec to precompile larger rule files.

Default is 256.

The default size of the background execution thread pool in which miscellaneous tasks are handled.

Default and minimum is 2 so that a single, potentially longer executing task (e.g. GC), is not blocking the entire execution.

Maximum size of thread pool to on which a serving thread can fan-out work to parallelize it.

When set to 0, a direct executor will be used.

By default, 25 which means that formatting happens in the caller thread.

Specifies the protocol used for receiving emails. Valid options are 'POP3', 'IMAP' and 'NONE'. Note that Gerrit will automatically switch between POP3 and POP3s as well as IMAP and IMAPS depending on the specified encryption.

Defaults to 'NONE' which means that receiving emails is disabled.

The hostname of the mailserver. Example: 'imap.gmail.com'.

Defaults to an empty string which means that receiving emails is disabled.

The port the email server exposes for receiving emails.

Defaults to the industry standard for a given protocol and encryption: POP3: 110; POP3S: 995; IMAP: 143; IMAPS: 993.

Username used for authenticating with the email server.

Defaults to an empty string.

Password used for authenticating with the email server.

Defaults to an empty string.

Encryption standard used for transport layer security between Gerrit and the email server. Possible values include 'NONE', 'SSL' and 'TLS'.

Defaults to 'NONE'.

Time between two consecutive fetches from the email server. Communication with the email server is not kept alive. Examples: 60s, 10m, 1h.

Defaults to 60 seconds.

If the IMAP protocol is used for retrieving emails, IMAPv4 IDLE can be used to keep the connection with the email server alive and receive a push when a new email is delivered to the inbox. In this case, Gerrit will process the email immediately and will not have a fetch delay.

Defaults to false.

An allow and block filter to filter incoming emails.

If OFF, emails are not filtered by the list filter.

If ALLOW, only emails where a pattern from receiveemail.filter.patterns matches 'From' will be processed.

If BLOCK, only emails where no pattern from receiveemail.filter.patterns matches 'From' will be processed.

Defaults to OFF.

The previous filter-names 'BLACKLIST' and 'WHITELIST' have been deprecated since they may be considered disrespectful and there’s no technical or practical reason to use these exact terms for the filters. For backwards compatibility they are still supported but support for these deprecated terms will be removed in future releases.

A list of regular expressions to match the email sender against. This can also be a list of addresses when regular expression characters are escaped.

If false Gerrit will not send email messages, for any reason, and all other properties of section sendemail are ignored.

By default, true, allowing notifications to be sent.

If false, Gerrit will only send plain-text emails. If true, Gerrit will send multi-part emails with an HTML and plain text part.

By default, true, allowing HTML in the emails Gerrit sends.

The connection timeout of opening a socket connected to a remote SMTP server.

Values can be specified using standard time unit abbreviations ('ms', 'sec', 'min', etc.). If no unit is specified, milliseconds is assumed.

Default is 0. A timeout of zero is interpreted as an infinite timeout. The connection will then block until established or an error occurs.

Maximum size of thread pool in which the review comments notifications are sent out asynchronously.

By default, 1.

Designates what name and address Gerrit will place in the From field of any generated email messages. The supported values are:

By default, MIXED.

Only used when sendemail.from is set to USER. List of allowed domains. If user’s email matches one of the domains, emails will be sent as USER, otherwise as MIXED mode. Wildcards may be specified by including * to match any number of characters, for example *.example.com matches any subdomain of example.com.

By default, *.

Hostname (or IP address) of a SMTP server that will relay messages generated by Gerrit to end users.

By default, 127.0.0.1 (aka localhost).

Port number of the SMTP server in sendemail.smtpserver.

By default, 25, or 465 if smtpEncryption is 'ssl'.

Specify the encryption to use, either 'ssl' or 'tls'.

By default, 'none', indicating no encryption is used.

If false and sendemail.smtpEncryption is 'ssl' or 'tls', Gerrit will not verify the server certificate when it connects to send an email message.

By default, true, requiring the certificate to be verified.

User name to authenticate with, if required for relay.

Password for the account named by sendemail.smtpUser.

If present, each value adds one entry to the list of allowed email addresses that Gerrit can send emails to. If set to a complete email address, that one address is added to the list of allowed emails. If set to a domain name, any address at that domain can receive email from Gerrit.

If allowrcpt is configured, The set of allowed recipients is: allowrcpt - denyrcpt.

By default, unset, permitting delivery to any email address.

If present, each value adds one entry to the list of email addresses that Gerrit can’t send emails to. If set to a complete email address, that one address is added to the list of blocked emails. If set to a domain name, any address at that domain can not receive email from Gerrit.

By default, unset, permitting delivery to any email address.

If true, new change emails and merged change emails from Gerrit will include the complete unified diff of the change. Variable maxmimumDiffSize places an upper limit on how large the email can get when this option is enabled.

By default, false.

Largest size of unified diff output to include in an email. When the diff exceeds this size the file paths will be listed instead. Standard byte unit suffixes are supported.

By default, 256 KiB.

If present, emails sent from Gerrit will have the given level of importance. Valid values include 'high' and 'low', which email clients will render in different ways.

By default, unset, so no Importance header is generated.

If present, emails sent from Gerrit will expire after the given number of days. This will add the Expiry-Date header and email clients may expire or expunge mails whose Expiry-Date header is in the past. This should be a positive non-zero number indicating how many days in the future the mails should expire.

By default, unset, so no Expiry-Date header is generated.

A custom Reply-To address should only be provided if Gerrit is set up to receive emails and the inbound address differs from sendemail.from. It will be set as Reply-To header on all types of outgoing email where Gerrit can parse back a user’s reply.

Defaults to an empty string which adds sendemail.from as Reply-To if inbound email is enabled and the review’s author otherwise.

List of custom TLDs to allow sending emails to in addition to those specified in the IANA list.

Defaults to an empty list, meaning no additional TLDs are allowed.

When set to true, Gerrit will add its short name to the email subject, allowing recipients to quickly identify what Gerrit instance the email came from.

The short name can be customized via the gerrit.instanceName option.

Defaults to false.

List of regular expressions matching origins that should be permitted to use the full Gerrit REST API. These should be trusted applications, as the sites may be able to use the user’s credentials. Applies to all requests, including state changing methods (PUT, DELETE, POST).

Expressions should not require trailing slash. For example a valid pattern might be .example[.]com.

By default, unset, denying all cross-origin requests.

If true the server checks the site header, footer and CSS files for updated versions. If false, a server restart is required to change any of these resources. Default is true, allowing automatic reloads.

In the general case, we want to disable transparent compression, since the majority of our data transfer is highly compressed Git pack files and we cannot make them any smaller than they already are.

However, if there are CPU in abundance and the server is reachable through slow networks, gits with huge amount of refs can benefit from SSH-compression since git does not compress the ref announcement during handshake.

Compression can be especially useful when Gerrit replicas are being used for the larger clones and fetches and the primary server mostly takes small receive-packs.

By default, false.

Starting from version 0.9.0 Apache SSHD project added support for NIO2 IoSession. To use the old MINA session the backend option must be set to MINA.

By default, NIO2.

Specifies the local addresses the internal SSHD should listen for connections on. The following forms may be used to specify an address. In any form, :'port' may be omitted to use the default of 29418.

Specifies the addresses clients should be told to connect to. This may differ from sshd.listenAddress if a firewall based port redirector is being used, making Gerrit appear to answer on port 22. The following forms may be used to specify an address. In any form, :'port' may be omitted to use the default SSH port of 22.

If true, enables TCP keepalive messages to the other side, so the daemon can terminate connections if the peer disappears.

Only effective when sshd.backend is set to MINA.

By default, true.

Number of threads to use when executing SSH command requests. If additional requests are received while all threads are busy they are queued and serviced in a first-come-first-served order.

By default, 2x the number of CPUs available to the JVM (but at least 4 threads).

Number of threads to allocate for SSH command requests from service users. If equals to 0, then all non-interactive requests are executed in the same queue as interactive requests.

Any other value will remove the number of threads from the queue allocated to interactive users, and create a separate thread pool of the requested size, which will be used to run commands from service users.

If the number of threads requested for service users is larger than the total number of threads allocated in sshd.threads, then the value of sshd.threads is increased to accommodate the requested value.

By default is 1 on single core node, 2 otherwise.

Number of threads to use when formatting events to asynchronous streaming clients. Event formatting is multiplexed onto this thread pool by a simple FIFO scheduling system.

By default, 1 plus the number of CPUs available to the JVM.

Number of threads used to parse a command line submitted by a client over SSH for execution, create the internal data structures used by that command, and schedule it for execution on another thread.

By default, 2.

Maximum number of authentication attempts before the server disconnects the client. Each public key that a client has loaded into its local agent counts as one auth request. Users can work around the server’s limit by loading less keys into their agent, or selecting a specific key in their ~/.ssh/config file with the IdentityFile option.

By default, 6.

Time in seconds that a client has to authenticate before the server automatically terminates their connection. Values should use common unit suffixes to express their setting:

By default, 2 minutes.

Time in seconds after which the server automatically terminates idle connections (or 0 to disable closing of idle connections) not waiting for any server operation to complete. Values should use common unit suffixes to express their setting:

By default, 0.

Time in seconds after which the server automatically terminates connections waiting for a server operation to complete, like for instance cloning a very large repo with lots of refs. Values should use common unit suffixes to express their setting:

By default, 30s.

Set a graceful stop time. If set, Gerrit ensures that all open SSH sessions are preserved for a maximum period of time, before forcing the shutdown of the SSH daemon. During this period, no new requests will be accepted. This option is meant to be used in setups performing rolling restarts.

Values should use common unit suffixes to express their setting:

Maximum number of concurrent SSH sessions that a user account may open at one time. This is the number of distinct SSH logins that each user may have active at one time, and is not related to the number of commands a user may issue over a single connection. If set to 0, there is no limit.

By default, 64.

Available ciphers. To permit multiple ciphers, specify multiple sshd.cipher keys in the configuration file, one cipher name per key. Cipher names starting with + are enabled in addition to the default ciphers, cipher names starting with - are removed from the default cipher set.

Supported ciphers:

Available MAC (message authentication code) algorithms. To permit multiple algorithms, specify multiple sshd.mac keys in the configuration file, one MAC per key. MAC names starting with + are enabled in addition to the default MACs, MAC names starting with - are removed from the default MACs.

Supported MACs:

Enable deprecated kex algorithms:

Enable kerberos authentication for SSH connections. To permit kerberos authentication, the server must have a host principal (see sshd.kerberosPrincipal) which is acquired from a keytab. This must be provisioned by the kerberos administrators, and is typically installed into /etc/krb5.keytab on host machines.

The keytab must contain at least one host/ principal, typically using the host’s canonical name. If it does not use the canonical name, the sshd.kerberosPrincipal should be configured with the correct name.

By default, not set and so kerberos authentication is not enabled.

If kerberos authentication is enabled with sshd.kerberosKeytab, instead use the given principal name instead of the default. If the principal does not begin with host/ a warning message is printed and may prevent successful authentication.

This may be useful if the host is behind an IP load balancer or other SSH forwarding systems, since the principal name is constructed by the client and must match for kerberos authentication to work.

By default, host/canonical.host.name

Enable (or disable) the '$site_path'/logs/sshd_log request log. If enabled, a request log file is written out by the SSH daemon. The sshd log format is documented here.

log4j.appender with the name sshd_log can be configured to overwrite programmatic configuration.

By default, true.

This value supports configuration reloads.

The SSH daemon will issue a rekeying after a certain amount of data. This configuration option allows you to tweak that setting.

By default, 1073741824 (bytes, 1GB).

The rekeyBytesLimit cannot be set to lower than 32.

The SSH daemon will issue a rekeying after a certain amount of time. This configuration option allows you to tweak that setting.

By default, 1h.

Set to 0 to disable this check.

The maximum numbers of reviewers suggested.

By default 10.

This value supports configuration reloads.

The number of characters that a user must have typed before suggestions are provided. If set to 0, suggestions are always provided. This is only used for suggesting accounts when adding members to a group.

By default 0.

When suggesting reviewers, we go over recent changes of the user, and give priority to users that are present as reviewers in any of those changes. The number of changes we go over is sugggest.relevantChanges.

This nubmer is a tradeoff between speed and accuracy. A high number would be accurate but slow, and a low number would be fast but inaccurate.

By default 50.

If service users should be skipped when suggesting reviewers.

By default true.

Whether performance logging is enabled.

When performance logging is enabled, performance events for some operations are collected in memory while a request is running. At the end of the request the performance events are handed over to the PerformanceLogger plugins. This means if performance logging is enabled, the memory footprint of requests can be markedly increased. In one recorded case the impact was an overall heap increase of 40% (using the metrics-reporter-graphite plugin), in other instances the heap increase wasn’t nearly as dramatic and the impact is most likely dependent on which plugin is used.

By default, false.

A prefix tag that identifies the footer line to parse for tracking ids.

Several trackingid entries can have the same footer tag, and a single trackingid entry can have multiple footer tags.

If multiple footer tags are specified, each tag will be parsed separately and duplicates will be ignored.

The trailing ":" is optional.

A standard Java regular expression (java.util.regex) used to match the external tracking id part of the footer line. The match can result in several entries in the DB. If grouping is used in the regex the first group will be interpreted as the tracking id. Tracking ids longer than 32 characters will be ignored.

The configuration file parser eats one level of backslashes, so the character class \s requires \\s in the configuration file. The parser also terminates the line at the first #, so a match expression containing # must be wrapped in double quotes.

The name of the external tracking system (maximum 20 characters). It is possible to have several trackingid entries for the same tracking system.

Number of seconds to wait for a single network read or write to complete before giving up and declaring the remote side is not responding. If 0, there is no timeout, and this server will wait indefinitely for a transfer to finish.

A timeout should be large enough to mostly transfer the objects to the other side. 1 second may be too small for larger projects, especially over a WAN link, while 10-30 seconds is a much more reasonable timeout value.

Defaults to 0 seconds, wait indefinitely.

Name of the groups of users that are allowed to execute 'upload-pack'. One or more groups can be set.

If no groups are added, any user will be allowed to execute 'upload-pack' on the server.

The start time for running account deactivations.

The interval for running account deactivations.

When using automatic superproject updates this option will determine how the submodule commit messages are included into the commit message of the superproject update.

If FALSE, will not include any commit messages for the gitlink update.

If SUBJECT_ONLY, will include only the commit subjects.

If TRUE, will include full commit messages.

By default this is TRUE.

This allows to enable the superproject subscription mechanism.

By default this is true.

This allows to limit the length of the commit message for a submodule.

By default this is 262144 (256 KiB).

Common unit suffixes of k, m, or g are supported.

This allows to limit the number of commit messages that should be combined when creating a commit message for a submodule.

By default this is 1000.

Name that Gerrit calls itself in Git when it creates a new Git commit, such as a merge during change submission.

By default this is "Gerrit Code Review".

Email address that Gerrit refers to itself as when it creates a new Git commit, such as a merge commit during change submission.

If not set, Gerrit generates this as "gerrit@hostname", where hostname is the hostname of the system Gerrit is running on.

By default, not set, generating the value at startup.

Username that is displayed in the Gerrit Web UI and in e-mail notifications if the full name of the user is not set.

By default "Name of user not set" is used.

Local filesystem directory holding the site customization assets. Placing this directory under version control and/or backup is a good idea.

Files in this directory provide additional configuration.

Other files support site customization.

When there are approximately more than this many loose objects in the repository, auto gc will pack them. Some commands use this command to perform a light-weight garbage collection from time to time. The default value is 6700.

Setting this to 0 disables not only automatic packing based on the number of loose objects, but any other heuristic auto gc will otherwise use to determine if there’s work to do, such as gc.autoPackLimit.

Makes auto gc run in a background thread. Default is true.

When there are more than this many packs that are not marked with *.keep file in the repository, auto gc consolidates them into one larger pack. The default value is 50. Setting this to 0 disables it. Setting gc.auto to 0 will also disable this.

This variable determines whether gc runs git pack-refs. The default is true.

Removes reflog entries older than this time; defaults to 90 days. The value "now" expires all entries immediately, and "never" suppresses expiration altogether.

Removes reflog entries older than this time and not reachable from the current tip; defaults to 30 days. The value "now" expires all entries immediately, and "never" suppresses expiration altogether.

If set, the server will accept requests from a client attempting to communicate using the specified protocol version. Default is 2. If set in file etc/jgit.config this option will be used for all repositories of the site. It can be overridden for a given repository by configuring a different value in the repository’s config file.

Supported versions:

By default, up to Gerrit 3.2 git-receive-pack will run auto gc after receiving data from git-push and updating refs. You can stop it by setting this variable to false. This is recommended in gerrit to avoid the additional load this creates. Instead schedule gc using gc.startTime and gc.interval or e.g. in a cron job that runs gc in a separate process. Since Gerrit 3.3 the init command will auto-configure git-receive-pack = false in etc/jgit.config if it wasn’t set manually and show a warning if it was set to true manually.