Gerrit Code Review - Configuration

File `etc/gerrit.config`

The optional file '$site_path'/etc/gerrit.config is a Git-style config file that controls many host specific settings for Gerrit.

Note	The contents of the `etc/gerrit.config` file are cached at startup by Gerrit. If you modify any properties in this file, Gerrit needs to be restarted before it will use the new values.

Sample etc/gerrit.config:

[core]
  packedGitLimit = 200 m

[cache]
  directory = /var/cache/gerrit2

Section accounts

accounts.visibility: 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.

Section addreviewer

addreviewer.maxWithoutConfirmation: 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 WebUI, but is ignored when adding reviewers with the set-reviewers command.
addreviewer.maxAllowed: 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.

Section auth

Section cache

cache.directory

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.

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

Default is unset, no disk cache.

cache.<name>.maxAge

Maximum age to keep an entry in the cache. Entries are removed from the cache and refreshed from source data every maxAge interval. Values should use common unit suffixes to express their setting:

s, sec, second, seconds
m, min, minute, minutes
h, hr, hour, hours
d, day, days
w, week, weeks (1 week is treated as 7 days)
mon, month, months (1 month is treated as 30 days)
y, year, years (1 year is treated as 365 days)

If a unit suffix is not specified, seconds is assumed. If 0 is supplied, the maximum age is infinite and items are never purged except when the cache is full.

Default is 0, meaning store forever with no expire, except:

"adv_bases": default is 10 minutes
"ldap_groups": default is 1 hour
"web_sessions": default is 12 hours

cache.<name>.memoryLimit

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 "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:

"adv_bases": default is 4096
"diff": default is 10m (10 MiB of memory)
"diff_intraline": default is 10m (10 MiB of memory)
"plugin_resources": default is 2m (2 MiB of memory)

If set to 0 the cache is disabled. Entries are removed immediately after being stored by the cache. This is primarily useful for testing.

cache.<name>.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.

If 0, disk storage for the cache is disabled.

Standard Caches

cache "accounts"

Cache entries contain important details of an active user, including their display name, preferences, known email addresses, and group memberships. Entry information is obtained from the following database tables:

accounts
account_group_members
account_external_ids

If direct updates are made to any of these database tables, this cache should be flushed.

cache "accounts_byemail"

Caches account identities keyed by email address, which is scanned from the account_external_ids database table. If updates are made to this table, this cache should be flushed.

cache "adv_bases"

Used only for push over smart HTTP when branch level access controls are enabled. The cache entry contains all commits that are avaliable for the client to use as potential delta bases. Push over smart HTTP requires two HTTP requests, and this cache tries to carry state from the first request into the second to ensure it can complete.

cache "changes"

The size of memoryLimit determines the number of projects for which all changes will be cached. If the cache is set to 1024, this means all changes for up to 1024 projects can be held in the cache.

Default value is 0 (disabled). It is disabled by default due to the fact that change updates are not communicated between Gerrit servers. Hence this cache should be disabled in an multi-master/multi-slave setup.

The cache should be flushed whenever the database changes table is modified outside of gerrit.

cache "diff"

Each item caches the differences between two commits, at both the directory and file levels. Gerrit uses this cache to accelerate the display of affected file names, as well as file contents.

Entries in this cache are relatively large, so memoryLimit is an estimate in bytes of memory used. Administrators should try to target cache.diff.memoryLimit to fit all changes users will view in a 1 or 2 day span.

cache "diff_intraline"

Each item caches the intraline difference of one file, when compared between two commits. Gerrit uses this cache to accelerate display of intraline differences when viewing a file.

Entries in this cache are relatively large, so memoryLimit is an estimate in bytes of memory used. Administrators should try to target cache.diff.memoryLimit to fit all files users will view in a 1 or 2 day span.

cache "git_tags"

If branch or reference level READ access controls are used, this cache tracks which tags are reachable from the branch tips of a repository. Gerrit uses this information to determine the set of tags that a client may access, derived from which tags are part of the history of a visible branch.

The cache is persisted to disk across server restarts as it can be expensive to compute (60 or more seconds for a large history like the Linux kernel repository).

cache "groups"

Caches the basic group information from the account_groups table, including the group owner, name, and description.

Gerrit group membership obtained from the account_group_members table is cached under the "accounts" cache, above. External group membership obtained from LDAP is cached under "ldap_groups".

cache "groups_byinclude"

Caches group inclusions in other groups. If direct updates are made to the account_group_includes table, this cache should be flushed.

cache "ldap_groups"

Caches the LDAP groups that a user belongs to, if LDAP has been configured on this server. This cache should be configured with a low maxAge setting, to ensure LDAP modifications are picked up in a timely fashion.

cache "ldap_groups_byinclude"

Caches the hierarchical structure of LDAP groups.

cache "ldap_usernames"

Caches a mapping of LDAP username to Gerrit account identity. The cache automatically updates when a user first creates their account within Gerrit, so the cache expire time is largely irrelevant.

cache "permission_sort"

Caches the order in which access control sections must be applied to a reference. Sorting the sections can be expensive when regular expressions are used, so this cache remembers the ordering for each branch.

cache "plugin_resources"

Caches formatted plugin resources, such as plugin documentation that has been converted from Markdown to HTML. The memoryLimit refers to the bytes of memory dedicated to storing the documentation.

cache "projects"

Caches the project description records, from the projects table in the database. If a project record is updated or deleted, this cache should be flushed. Newly inserted projects do not require a cache flush, as they will be read upon first reference.

cache "sshkeys"

Caches unpacked versions of user SSH keys, so the internal SSH daemon can match against them during authentication. The unit of storage is per-user, so 1024 items translates to 1024 unique user accounts. As each individual user account may configure multiple SSH keys, the total number of keys may be larger than the item count.

This cache is based off the account_ssh_keys table and the accounts.ssh_user_name column in the database. If either is modified directly, this cache should be flushed.

cache "web_sessions"

Tracks the live user sessions coming in over HTTP. Flushing this cache would cause all users to be signed out immediately, forcing them to sign-in again. To avoid breaking active users, this cache is not flushed automatically by gerrit flush-caches --all, but instead must be explicitly requested.

If no disk cache is configured (or cache.web_sessions.diskLimit is set to 0) a server restart will force all users to sign-out, and need to sign-in again after the restart, as the cache was unable to persist the session information. Enabling a disk cache is strongly recommended.

Session storage is relatively inexpensive. The average entry in this cache is approximately 346 bytes.

Cache Options

cache.diff_intraline.maxIdleWorkers

Number of idle worker threads to maintain for the intraline difference computations. There is no upper bound on how many concurrent requests can occur at once, if additional threads are started to handle a peak load, only this many will remain idle afterwards.

Default is 1.5x number of available CPUs.

cache.diff_intraline.timeout

Maximum number of milliseconds to wait for intraline difference data before giving up and disabling it for a particular file pair. This is a work around for an infinite loop bug in the intraline difference implementation.

If computation takes longer than the timeout, the worker thread is terminated, an error message is shown, and no intraline difference is displayed for the file pair.

Values should use common unit suffixes to express their setting:

ms, milliseconds
s, sec, second, seconds
m, min, minute, minutes
h, hr, hour, hours

If a unit suffix is not specified, milliseconds is assumed.

Default is 5 seconds.

cache.diff_intraline.enabled

Boolean to enable or disable the computation of intraline differences when populating a diff cache entry. This flag is provided primarily as a backdoor to disable the intraline difference feature if necessary. To maintain backwards compatability with prior versions, this setting will fallback to cache.diff.intraline if not set in the configuration.

Default is true, enabled.

cache.projects.checkFrequency

How often project configuration should be checked for update from Git. Gerrit Code Review caches project access rules and configuration in memory, checking the refs/meta/config branch every checkFrequency minutes to see if a new revision should be loaded and used for future access. Values can be specified using standard time unit abbreviations (ms, sec, min, etc.).

If set to 0, checks occur every time, which may slow down operations. If set to disabled or off, no check will ever be done. Administrators may force the cache to flush with gerrit flush-caches.

Default is 5 minutes.

Section changeMerge

changeMerge.checkFrequency: How often the database should be rescanned for changes that have been submitted but not merged due to transient errors. Values can be specified using standard time unit abbreviations (ms, sec, min, etc.). Set to 0 to disable periodic rescanning, only scanning once on master node startup.

Default is 300 seconds (5 minutes).
changeMerge.test: Controls whether or not the mergeability test of changes is enabled. If enabled, when the change page is loaded, the test is triggered. The submit button will be enabled or disabled according to the result.

By default this is false (test is not enabled).

Section commentlink

Comment links are find/replace strings applied to change descriptions, patch comments, in-line code comments and approval category value descriptions to turn set strings into hyperlinks. One common use is for linking to bug-tracking systems.

In the following example configuration the changeid comment link will match typical Gerrit Change-Id values and create a hyperlink to changes which reference it. The second configuration bugzilla will hyperlink terms such as bug 42 to an external bug tracker, supplying the argument record number 42 for display. The third configuration tracker uses raw HTML to more precisely control how the replacement is displayed to the user.

[commentlink "changeid"]
  match = (I[0-9a-f]{8,40})
  link = "#q,$1,n,z"

[commentlink "bugzilla"]
  match = "(bug\\s+#?)(\\d+)"
  link = http://bugs.example.com/show_bug.cgi?id=$2

[commentlink "tracker"]
  match = ([Bb]ug:\\s+)(\\d+)
  html = $1<a href=\"http://trak.example.com/$2\">$2</a>

Comment links can also be specified in project.config and sections in children override those in parents. The only restriction is that to avoid injecting arbitrary user-supplied HTML in the page, comment links defined in project.config may only supply link, not html.

commentlink.<name>.match: 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.

A common pattern to match is bug\\s+(\\d+).
commentlink.<name>.link: The URL to direct the user to whenever the regular expression is matched. Groups in the match expression may be accessed as $'n'.

The link property is used only when the html property is not present.
commentlink.<name>.html: HTML to replace the entire matched string with. If present, this property overrides the link property above. Groups in the match expression may be accessed as $'n'.

The configuration file eats double quotes, so escaping them as \" is necessary to protect them from the parser.
commentlink.<name>.enabled: 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.

Disabling sections in gerrit.config can be used by site administrators to create a library of comment links with html set that are not user-supplied and thus can be verified to be XSS-free, but are only enabled for a subset of projects.

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

Section contactstore

contactstore.url: URL of the web based contact store Gerrit will send any offline contact information to when it collects the data from users as part of a contributor agreement.

See Contact Information.
contactstore.appsec: Shared secret of the web based contact store.

Section container

These settings are applied only if Gerrit is started as the container process through Gerrit’s gerrit.sh rc.d compatible wrapper script.

container.heapLimit: 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.
container.javaHome: 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.
container.javaOptions: Additional options to pass along to the Java runtime. If multiple values are configured, they are passed in order on the command line, separated by spaces. These options are appended onto JAVA_OPTIONS.
container.slave: Used on Gerrit slave installations. If set to true the Gerrit JVM is called with the --slave switch, enabling slave mode. If no value is set (or any other value), gerrit defaults to master mode.
container.user: 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.
container.war: 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.

Section core

core.packedGitWindowSize: 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.
core.packedGitLimit: 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.
core.deltaBaseCacheLimit: 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.
core.packedGitOpenFiles: 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.
core.streamFileThreshold: 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 psuedo-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.

Default is 50 MiB on all platforms. Prior to Gerrit 2.1.6, this value was effectively 2047 MiB.

Common unit suffixes of k, m, or g are supported.
core.packedGitMmap: 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 artifically 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.
core.asyncLoggingBufferSize: 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 loosing log entries in this case.

Default is 64 entries.
core.useRecursiveMerge: Use JGit’s new, experimental recursive merger for three-way merges. This only affects projects configured to automatically resolve conflicts.

Default is false, but in a future release may default to true.

Section database

The database section configures where Gerrit stores its metadata records about user accounts and change reviews.

[database]
  type = POSTGRESQL
  hostname = localhost
  database = reviewdb
  username = gerrit2
  password = s3kr3t

database.type

Type of database server to connect to. If set this value will be used to automatically create correct database.driver and database.url values to open the connection.

POSTGRESQL

Connect to a PostgreSQL database server.
H2

Connect to a local embedded H2 database.
MYSQL

Connect to a MySQL database server.
JDBC

Connect using a JDBC driver class name and URL.

If not specified, database.driver and database.url are used as-is, and if they are also not specified, defaults to H2.

database.hostname

Hostname of the database server. Defaults to localhost.

database.port

Port number of the database server. Defaults to the default port of the server named by database.type.

database.database

For POSTGRESQL or MYSQL, the name of the database on the server.

For H2, this is the path to the database, and if not absolute is relative to '$site_path'.

database.username

Username to connect to the database server as.

database.password

Password to authenticate to the database server with.

database.driver

Name of the JDBC driver class to connect to the database with. Setting this usually isn’t necessary as it can be derived from database.type or database.url for any supported database.

database.url

jdbc: URL for the database. Setting this variable usually isn’t necessary as it can be constructed from the all of the above properties.

database.connectionPool

If true, use connection pooling for database connections. Otherwise, a new database connection is opened for each request.

Default is false for MySQL, and true for other database backends.

database.poolLimit

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 8.

This setting only applies if database.connectionPool is true.

database.poolMinIdle

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

This setting only applies if database.connectionPool is true.

database.poolMaxIdle

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 4.

This setting only applies if database.connectionPool is true.

database.poolMaxWait

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:

ms, milliseconds
s, sec, second, seconds
m, min, minute, minutes
h, hr, hour, hours

If a unit suffix is not specified, milliseconds is assumed.

Default is 30 seconds.

This setting only applies if database.connectionPool is true.

Section download

[download]
  command = checkout
  command = cherry_pick
  command = pull
  command = format_patch
  scheme = ssh
  scheme = http
  scheme = anon_http
  scheme = anon_git
  scheme = repo_download

The download section configures the allowed download methods.

download.command

Commands that should be offered to download changes.

Multiple commands are supported:

checkout

Command to fetch and checkout the patch set.
cherry_pick

Command to fetch the patch set and to cherry-pick it onto the current commit.
pull

Command to pull the patch set.
format_patch

Command to fetch the patch set and to feed it into the format-patch command.

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

download.scheme

Schemes that should be used to download changes.

Multiple schemes are supported:

http

Authenticated HTTP download is allowed.
ssh

Authenticated SSH download is allowed.
anon_http

Anonymous HTTP download is allowed.
anon_git

Anonymous Git download is allowed. This is not default, it is also necessary to set gerrit.canonicalGitUrl variable.
repo_download

Gerrit advertises patch set downloads with the repo download command, assuming that all projects managed by this instance are generally worked on with the repo multi-repository tool. This is not default, as not all instances will deploy repo.

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

Section gerrit

gerrit.basePath: 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'.
gerrit.allProjects: 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.

Defaults to All-Projects if not set.
gerrit.canonicalWebUrl: The default URL for Gerrit to be accessed through.

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

Setting this is highly recommended, as its necessary for the upload code invoked by "git push" or "repo upload" to output hyperlinks to the newly uploaded changes.
gerrit.canonicalGitUrl: 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.
gerrit.gitHttpUrl: 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.
gerrit.reportBugUrl: URL to direct users to when they need to report a bug about the Gerrit service. By default this links to the upstream Gerrit Code Review’s own bug tracker but could be directed to the system administrator’s ticket queue.

Section gitweb

Gerrit can forward requests to either an internally managed gitweb (which allows Gerrit to enforce some access controls), or to an externally managed gitweb (where the web server manages access). See also Gitweb Integration.

gitweb.cgi: 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.
gitweb.url: 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".
gitweb.type: Optional type of affiliated gitweb service. This allows using alternatives to gitweb, such as cgit. If set to disabled there is no gitweb hyperlinking support.

Valid values are gitweb, cgit, disabled or custom.
gitweb.revision: Optional pattern to use for constructing the gitweb URL when pointing at a specific commit when custom is used above.

Valid replacements are ${project} for the project name in Gerrit and ${commit} for the SHA1 hash for the commit.
gitweb.project: Optional pattern to use for constructing the gitweb URL when pointing at a specific project when custom is used above.

Valid replacements are ${project} for the project name in Gerrit.
gitweb.branch: Optional pattern to use for constructing the gitweb URL when pointing at a specific branch when custom is used above.

Valid replacements are ${project} for the project name in Gerrit and ${branch} for the name of the branch.
gitweb.filehistory: Optional pattern to use for constructing the gitweb URL when pointing at the history of a file in a specific branch when custom is used above.

Valid replacements are ${project} for the project name in Gerrit, ${file} for the file name and ${branch} for the name of the branch.
gitweb.linkname: Optional setting for modifying the link name presented to the user in the Gerrit web-UI.

Default linkname for custom type is "gitweb".
gitweb.pathSeparator: 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 ).
gitweb.linkDrafts: Whether or not Gerrit should provide links to gitweb on draft patch sets.

By default, Gerrit will show links to gitweb on all patch sets. If gitweb only allows publicly viewable references, set this to false to remove the links to draft patch sets from the change review screen.

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

Section groups

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

By default, false.

Section hooks

Section http

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

Section httpd

The httpd section configures the embedded servlet container.

httpd.listenUrl

Specifies the URLs the internal HTTP daemon should listen for connections on. The special hostname * may be used to listen on all local addresses. A context path may optionally be included, placing Gerrit Code Review’s web address within a subdirectory of the server.

Multiple protocol schemes are supported:

http://hostname:port

Plain-text HTTP protocol. If port is not supplied, defaults to 80, the standard HTTP port.
https://hostname:port

SSL encrypted HTTP protocol. If port is not supplied, defaults to 443, the standard HTTPS port.

Externally facing production sites are encouraged to use a reverse proxy configuration and proxy-https:// (below), rather than using the embedded servlet container to implement the SSL processing. The proxy server with SSL support is probably easier to configure, provides more configuration options to control cipher usage, and is likely using natively compiled encryption algorithms, resulting in higher throughput.
proxy-http://hostname:port

Plain-text HTTP relayed from a reverse proxy. If port is not supplied, defaults to 8080.

Like http, but additional header parsing features are enabled to honor X-Forwarded-For, X-Forwarded-Host and X-Forwarded-Server. These headers are typically set by Apache’s mod_proxy.
proxy-https://hostname:port

Plain text HTTP relayed from a reverse proxy that has already handled the SSL encryption/decryption. If port is not supplied, defaults to 8080.

Behaves exactly like proxy-http, but also sets the scheme to assume https:// is the proper URL back to the server.

If multiple values are supplied, the daemon will listen on all of them.

By default, http://*:8080.

httpd.reuseAddress

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.

httpd.requestHeaderSize

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.

httpd.sslKeyStore

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:

keytool -keystore keystore -alias jetty -genkey -keyalg RSA
chmod 600 keystore

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

By default, $site_path/etc/keystore.

httpd.sslKeyPassword

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.

httpd.requestLog

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.

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

httpd.acceptorThreads

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.

httpd.minThreads

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

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

httpd.maxThreads

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

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

httpd.maxQueued

Maximum number of client connections which can enter the worker thread pool waiting for a worker thread to become available. 0 disables the queue and permits infinite number of connections.

By default 50.

httpd.maxWait

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:

s, sec, second, seconds
m, min, minute, minutes
h, hr, hour, hours
d, day, days
w, week, weeks (1 week is treated as 7 days)
mon, month, months (1 month is treated as 30 days)
y, year, years (1 year is treated as 365 days)

If a unit suffix is not specified, minutes is assumed. If 0 is supplied, the maximum age is infinite and connections will not abort until the client disconnects.

By default, 5 minutes.

Section ldap

LDAP integration is only enabled if auth.type is set to HTTP_LDAP, LDAP or CLIENT_SSL_CERT_LDAP. See above for a detailed description of the auth.type settings and their implications.

An example LDAP configuration follows, and then discussion of the parameters introduced here. Suitable defaults for most parameters are automatically guessed based on the type of server detected during startup. The guessed defaults support both RFC 2307 and Active Directory.

[ldap]
  server = ldap://ldap.example.com

  accountBase = ou=people,dc=example,dc=com
  accountPattern = (&(objectClass=person)(uid=${username}))
  accountFullName = displayName
  accountEmailAddress = mail

  groupBase = ou=groups,dc=example,dc=com
  groupMemberPattern = (&(objectClass=group)(member=${dn}))

ldap.server

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.

ldap.sslVerify

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

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

ldap.username

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

ldap.password

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

ldap.referral

(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.

ldap.readTimeout

(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.

ldap.accountBase

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

ldap.accountScope

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

one: Search only one level below accountBase, but not recursive
sub or subtree: Search recursively below accountBase
base or object: Search exactly accountBase; probably not desired

Default is subtree as many directories have several levels.

ldap.accountPattern

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

ldap.accountFullName

(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}.

If set, users will be unable to modify their full name field, as Gerrit will populate it only from the LDAP data.

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

ldap.accountEmailAddress

(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.

ldap.accountSshUserName

(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.

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

ldap.accountMemberField

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

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

ldap.groupBase

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

ldap.groupScope

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

one: Search only one level below groupBase, but not recursive
sub or subtree: Search recursively below groupBase
base or object: Search exactly groupBase; probably not desired

Default is subtree as many directories have several levels.

ldap.groupPattern

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

ldap.groupMemberPattern

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.

ldap.groupName

(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.

ldap.localUsernameToLowerCase

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

ldap.authentication

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.

Typical jaas.conf.

KerberosLogin {
    com.sun.security.auth.module.Krb5LoginModule
            required
            useTicketCache=true
            doNotPrompt=true
            renewTGT=true;
};

See Java documentation on how to create the krb5.ini file.

Note the renewTGT property to make sure the TGT does not expire, and useTicketCache to use the TGT supplied by the operating system. As the whole point of using GSSAPI is to have passwordless authentication to the LDAP service, this option does not aquire a new TGT on its own.

On Windows servers the registry key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Lsa\Kerberos\Parameters must have the DWORD value allowtgtsessionkey set to 1 and the account must not have local administrator privileges.

Section mimetype

mimetype.<name>.safe: 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.

Common examples:

[mimetype "image/*"]
  safe = true

[mimetype "application/pdf"]
  safe = true

[mimetype "application/msword"]
  safe = true

[mimetype "application/vnd.ms-excel"]
  safe = true

Section pack

Global settings controlling how Gerrit Code Review creates pack streams for Git clients running clone, fetch, or pull. Most of these variables are per-client request, and thus should be carefully set given the expected concurrent request load and available CPU and memory resources.

pack.deltacompression: 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.
pack.threads: 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.

Section plugins

plugins.checkFrequency: 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.

Section receive

This section is used to set who can execute the receive-pack and to limit the maximum Git object size that receive-pack will accept. receive-pack is what runs on the server during a user’s push or repo upload command. It also contains some advanced options for tuning the behavior of Gerrit’s receive-pack mechanism.

[receive]
  allowGroup = GROUP_ALLOWED_TO_EXECUTE
  allowGroup = YET_ANOTHER_GROUP_ALLOWED_TO_EXECUTE
  maxObjectSizeLimit = 40 m

receive.checkMagicRefs: If true, Gerrit will verify the destination repository has no references under the magic refs/drafts, refs/for, or refs/publish branch namespaces. 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.
receive.checkReferencedObjectsAreReachable: 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 SHA1 references to access commits intended to be hidden from the user.

Default is true.
receive.allowGroup: 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.
receive.maxObjectSizeLimit: 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.

Default is zero.

Common unit suffixes of k, m, or g are supported.
receive.threadPoolSize: 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.
receive.changeUpdateThreads: Number of threads to perform change creation or patch set updates concurrently. Each thread uses its own database connection from the database connection pool, and if all threads are busy then main receive thread will also perform a change creation or patch set update.

Defaults to 1, using only the main receive thread. This feature is for databases with very high latency that can benfit from concurrent operations when multiple changes are impacted at once.
receive.timeout: 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.).

Default is 2 minutes. If no unit is specified, millisconds is assumed.

Section repository

Repositories in this sense are the same as projects.

In the following example configuration Registered Users is set to be the default owner of new projects.

[repository "*"]
  ownerGroup = Registered Users

Note	Currently only the repository name `*` is supported. This is a wildcard designating all repositories.

repository.<name>.ownerGroup: A name of a group which exists in the database. Zero, one or many groups are allowed. Each on its own line. Groups which don’t exist in the database are ignored.

Section rules

rules.enable: If true, Gerrit will load and excute 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.

Section sendemail

sendemail.enable

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.

sendemail.from

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

USER

Gerrit will set the From header to use the current user’s Full Name and Preferred Email. This may cause messsages to be classified as spam if the user’s domain has SPF or DKIM enabled and sendemail.smtpServer is not a trusted relay for that domain.
MIXED

Shorthand for ${user} (Code Review) <review@example.com> where review@example.com is the same as user.email. See below for a description of how the replacement is handled.
SERVER

Gerrit will set the From header to the same name and address it records in any commits Gerrit creates. This is set by user.name and user.email, or guessed from the local operating system.
Code Review <review@example.com>

If set to a name and email address in brackets, Gerrit will use this name and email address for any messages, overriding the name that may have been selected for commits by user.name and user.email. Optionally, the name portion may contain the placeholder ${user}, which is replaced by the Full Name of the current user.

By default, MIXED.

sendemail.smtpServer

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).

sendemail.smtpServerPort

Port number of the SMTP server in sendemail.smtpserver.

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

sendemail.smtpEncryption

Specify the encryption to use, either ssl or tls.

By default, none, indicating no encryption is used.

sendemail.sslVerify

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.

sendemail.smtpUser

User name to authenticate with, if required for relay.

sendemail.smtpPass

Password for the account named by sendemail.smtpUser.

sendemail.allowrcpt

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

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

sendemail.includeDiff

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.

sendemail.maximumDiffSize

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.

sendemail.importance

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.

sendemail.expiryDays

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.

Section site

site.checkUserAgent

If true the server checks the User-Agent HTTP header and sends the correct JavaScript to the client as part of the initial page load. This usually reduces a round-trip for the client, allowing the UI to start more quickly. If false, a tiny JavaScript loader is sent to the client instead to determine the correct code to use. Default is true.

site.refreshHeaderFooter

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.

site.enableDeprecatedQuery

If true the deprecated /query URL is available to return JSON and text results for changes. If false, the URL is disabled and returns 404 to clients. Default is true, enabling /query.

site.upgradeSchemaOnStartup

Control whether schema upgrade should be done on Gerrit startup. The following values are supported:

OFF

No automatic schema upgrade on startup.
AUTO

Perform schema migration on startup, if necessary. If, as a result of schema migration, there would be any unused database objects they will be dropped automatically.
AUTO_NO_PRUNE

Like AUTO but unused database objects will not be pruned.

The default is OFF.

Section ssh-alias

Variables in section ssh-alias permit the site administrator to alias another command from Gerrit or a plugin into the gerrit command namespace. To alias replication start to gerrit replicate:

[ssh-alias]
  replicate = replication start

Section sshd

sshd.listenAddress

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.

hostname:'port' (for example review.example.com:29418)
IPv4:'port' (for example 10.0.0.1:29418)
[IPv6]:'port' (for example [ff02::1]:29418)
*:'port' (for example *:29418)

If multiple values are supplied, the daemon will listen on all of them.

To disable the internal SSHD, set listenAddress to off.

By default, *:29418.

sshd.advertisedAddress

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.

hostname:'port' (for example review.example.com:22)
IPv4:'port' (for example 10.0.0.1:29418)
[IPv6]:'port' (for example [ff02::1]:29418)

If multiple values are supplied, the daemon will advertise all of them.

By default, sshd.listenAddress.

sshd.reuseAddress

By default, true.

sshd.tcpKeepAlive

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

By default, true.

sshd.threads

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, 1.5x the number of CPUs available to the JVM.

sshd.batchThreads

Number of threads to allocate for SSH command requests from non-interactive 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 non-interactive users.

If the number of threads requested for non-interactive users is larger than the total number of threads allocated in sshd.threads, then the value of sshd.threads is increased to accomodate the requested value.

By default, 0.

sshd.streamThreads

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.

sshd.commandStartThreads

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.

sshd.maxAuthTries

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.

sshd.loginGraceTime

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:

s, sec, second, seconds
m, min, minute, minutes
h, hr, hour, hours
d, day, days

By default, 2 minutes.

sshd.idleTimeout

Time in seconds after which the server automatically terminates idle connections (or 0 to disable closing of idle connections). Values should use common unit suffixes to express their setting:

s, sec, second, seconds
m, min, minute, minutes
h, hr, hour, hours
d, day, days

By default, 0.

sshd.maxConnectionsPerUser

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.

sshd.cipher

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: aes128-cbc, aes128-cbc, aes256-cbc, blowfish-cbc, 3des-cbc, none.

By default, all supported ciphers except none are available.

sshd.mac

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: hmac-md5, hmac-md5-96, hmac-sha1, hmac-sha1-96.

By default, all supported MACs are available.

sshd.kerberosKeytab

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.

sshd.kerberosPrincipal

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

Section suggest

suggest.accounts: If true, visible user accounts (according to the value of accounts.visibility) will be offered as completion suggestions when adding a reviewer to a change, or a user to a group.

If false, account suggestion is disabled.

Older configurations may also have one of the accounts.visibility values for this field, including OFF as a synonym for NONE. If accounts.visibility is also set, that value overrides this one; otherwise, this value applies to both suggest.accounts and accounts.visibility.

New configurations should prefer the boolean value for this field and an enum value for accounts.visibility.
suggest.from: The number of characters that a user must have typed before suggestions are provided. If set to 0, suggestions are always provided.

By default 0.

Section theme

theme.backgroundColor: Background color for the page, and major data tables like the all open changes table or the account dashboard. The value must be a valid HTML hex color code, or standard color name.

By default white, FFFFFF.
theme.topMenuColor: This is the color of the main menu bar at the top of the page. The value must be a valid HTML hex color code, or standard color name.

By default white, FFFFFF.
theme.textColor: Text color for the page, and major data tables like the all open changes table or the account dashboard. The value must be a valid HTML hex color code, or standard color name.

By default dark grey, 353535.
theme.trimColor: Primary color used as a background color behind text. This is the color of the main menu bar at the top, of table headers, and of major UI areas that we want to offset from other portions of the page. The value must be a valid HTML hex color code, or standard color name.

By default a light grey, EEEEEE.
theme.selectionColor: Background color used within a trimColor area to denote the currently selected tab, or the background color used in a table to denote the currently selected row. The value must be a valid HTML hex color code, or standard color name.

By default a pale blue, D8EDF9.
theme.changeTableOutdatedColor: Background color used for patch outdated messages. The value must be a valid HTML hex color code, or standard color name.

By default a shade of red, F08080.
theme.tableOddRowColor: Background color for tables such as lists of open reviews for odd rows. This is so you can have a different color for odd and even rows of the table. The value must be a valid HTML hex color code, or standard color name.

By default transparent.
theme.tableEvenRowColor: Background color for tables such as lists of open reviews for even rows. This is so you can have a different color for odd and even rows of the table. The value must be a valid HTML hex color code, or standard color name.

By default transparent.

A different theme may be used for signed-in vs. signed-out user status by using the "signed-in" and "signed-out" theme sections. Variables not specified in a section are inherited from the default theme.

[theme]
  backgroundColor = FFFFFF
[theme "signed-in"]
  backgroundColor = C0C0C0
[theme "signed-out"]
  backgroundColor = 00FFFF

Section trackingid

Tagged footer lines containing references to external tracking systems, parsed out of the commit message and saved in Gerrit’s database. After making changes to this section, existing changes must be reindexed with the ScanTrackingIds program.

The tracking ids are searchable using tr:<tracking id> or bug:<tracking id>.

[trackingid "jira-bug"]
  footer = Bugfix:
  match = JRA\\d{2,8}
  system = JIRA

[trackingid "jira-feature"]
  footer = Feature
  match = JRA(\\d{2,8})
  system = JIRA

trackingid.<name>.footer: A prefix tag that identify the footer line to parse for tracking ids. Several trackingid entries can have the same footer tag. A single trackingid entry can have multiple footer tags. If multiple footer tags are specified, each tag will be parsed separately. (the trailing ":" is optional)
trackingid.<name>.match: 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.
trackingid.<name>.system: The name of the external tracking system (maximum 10 characters). It is possible to have several trackingid entries for the same tracking system.

Section transfer

transfer.timeout: 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.

Section upload

Sets the group of users allowed to execute upload-pack on the server, upload-pack is what runs on the server during a user’s fetch, clone or repo sync command.

[upload]
  allowGroup = GROUP_ALLOWED_TO_EXECUTE
  allowGroup = YET_ANOTHER_GROUP_ALLOWED_TO_EXECUTE

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

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

Section user

user.name: 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".
user.email: 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.
user.anonymousCoward: Username that this displayed in the Gerrit WebUI and in e-mail notifications if the full name of the user is not set.

By default "Anonymous Coward" is used.

File `etc/secure.config`

The optional file '$site_path'/etc/secure.config overrides (or supplements) the settings supplied by '$site_path'/etc/gerrit.config. The file should be readable only by the daemon process and can be used to contain private configuration entries that wouldn’t normally be exposed to everyone.

Sample etc/secure.config:

[auth]
  registerEmailPrivateKey = 2zHNrXE2bsoylzUqDxZp0H1cqUmjgWb6
  restTokenPrivateKey = 7e40PzCjlUKOnXATvcBNXH6oyiu+r0dFk2c=

[database]
  username = webuser
  password = s3kr3t

[ldap]
  password = l3tm3srch

[httpd]
  sslKeyPassword = g3rr1t

[sendemail]
  smtpPass = sp@m

[remote "bar"]
  password = s3kr3t

File `etc/peer_keys`

The optional file '$site_path'/etc/peer_keys controls who can login as the Gerrit Code Review user, required for the suexec command.

The format is one Base-64 encoded public key per line.

Database system_config

Several columns in the system_config table within the metadata database may be set to control how Gerrit behaves.

Note	The contents of the `system_config` table are cached at startup by Gerrit. If you modify any columns in this table, Gerrit needs to be restarted before it will use the new values.

Configurable Parameters

site_path

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.

Themes

Part of Gerrit Code Review

Gerrit Code Review - Configuration

File etc/gerrit.config

Section accounts

Section addreviewer

Section auth

Section cache

Standard Caches

Cache Options

Section changeMerge

Section commentlink

Section contactstore

Section container

Section core

Section database

Section download

Section gerrit

Section gitweb

Section groups

Section hooks

Section http

Section httpd

Section ldap

Section mimetype

Section pack

Section plugins

Section receive

Section repository

Section rules

Section sendemail

Section site

Section ssh-alias

Section sshd

Section suggest

Section theme

Section trackingid

Section transfer

Section upload

Section user

File etc/secure.config

File etc/peer_keys

Database system_config

Configurable Parameters

File `etc/gerrit.config`

File `etc/secure.config`

File `etc/peer_keys`