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

[cache "diff"]
  diskbuffer = 10 m
----

[[accounts]]Section accounts
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[[accounts.visibility]]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`.

[[addreviewer]]Section addreviewer
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[[addreviewer.maxWithoutConfirmation]]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
link:cmd-set-reviewers.html[set-reviewers] command.

[[addreviewer.maxAllowed]]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.

[[auth]]Section auth
~~~~~~~~~~~~~~~~~~~~

See also link:config-sso.html[SSO configuration].

[[auth.type]]auth.type::
+
Type of user authentication employed by Gerrit.  The supported
values are:
+
* `OpenID`
+
The default setting.  Gerrit uses any valid OpenID
provider chosen by the end-user.  For more information see
http://openid.net/[openid.net].
+
* `HTTP`
+
Gerrit relies upon data presented in the HTTP request.  This includes
HTTP basic authentication, or some types of commercial single-sign-on
solutions.  With this setting enabled the authentication must
take place in the web server or servlet container, and not from
within Gerrit.
+
* `HTTP_LDAP`
+
Exactly like `HTTP` (above), but additionally Gerrit pre-populates
a user's full name and email address based on information obtained
from the user's account object in LDAP.  The user's group membership
is also pulled from LDAP, making any LDAP groups that a user is a
member of available as groups in Gerrit.
+
* `CLIENT_SSL_CERT_LDAP`
+
This authentication type is actually kind of SSO. Gerrit will configure
Jetty's SSL channel to request the client's SSL certificate. For this
authentication to work a Gerrit administrator has to import the root
certificate of the trust chain used to issue the client's certificate
into the <review-site>/etc/keystore.
After the authentication is done Gerrit will obtain basic user
registration (name and email) from LDAP, and some group memberships.
Therefore, the "_LDAP" suffix in the name of this authentication type.
This authentication type can only be used under hosted daemon mode, and
the httpd.listenUrl must use https:// as the protocol.
+
* `LDAP`
+
Gerrit prompts the user to enter a username and a password, which
it then verifies by performing a simple bind against the configured
<<ldap.server,ldap.server>>.  In this configuration the web server
is not involved in the user authentication process.
+
The actual username used in the LDAP simple bind request is the
account's full DN, which is discovered by first querying the
directory using either an anonymous request, or the configured
<<ldap.username>> identity.

* `LDAP_BIND`
+
Gerrit prompts the user to enter a username and a password, which
it then verifies by performing a simple bind against the configured
<<ldap.server,ldap.server>>.  In this configuration the web server
is not involved in the user authentication process.
+
Unlike LDAP above, the username used to perform the LDAP simple bind
request is the exact string supplied by in the dialog by the user.
The configured <<ldap.username>> identity is not used to obtain
account information.
+
* `DEVELOPMENT_BECOME_ANY_ACCOUNT`
+
*DO NOT USE*.  Only for use in a development environment.
+
When this is the configured authentication method a hyperlink titled
`Become` appears in the top right corner of the page, taking the
user to a form where they can enter the username of any existing
user account, and immediately login as that account, without any
authentication taking place.  This form of authentication is only
useful for the GWT hosted mode shell, where OpenID authentication
redirects might be risky to the developer's host computer, and HTTP
authentication is not possible.

+
By default, OpenID.

[[auth.allowedOpenID]]auth.allowedOpenID::
+
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
link:http://download.oracle.com/javase/6/docs/api/java/util/regex/Pattern.html[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.

[[auth.trustedOpenID]]auth.trustedOpenID::
+
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
link:http://download.oracle.com/javase/6/docs/api/java/util/regex/Pattern.html[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.

[[auth.maxOpenIdSessionAge]]auth.maxOpenIdSessionAge::
+
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:
+
* 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`)

+
Default is -1, permitting infinite time between authentications.

[[auth.maxRegisterEmailTokenAge]]auth.maxRegisterEmailTokenAge::
+
Time in seconds before an email verification token sent to a user in
order to validate their email address expires.
+
* 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`)

+
Default is 12 hours.

[[auth.httpHeader]]auth.httpHeader::
+
HTTP header to trust the username from, or unset to select HTTP basic
or digest authentication.  Only used if `auth.type` is set to HTTP.

[[auth.logoutUrl]]auth.logoutUrl::
+
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.

[[auth.registerUrl]]auth.registerUrl::
+
Target for the "Register" link in the upper right corner.  Used only
when auth.type is `LDAP`.
+
If not set, no "Register" link is displayed.

[[auth.cookiePath]]auth.cookiePath::
+
Sets "path" attribute of the authentication cookie.
+
If not set, HTTP request's path is used.

[[auth.cookieSecure]]auth.cookieSecure::
+
Sets "secure" flag of the authentication cookie.  If true, cookies
will be transmitted only over HTTPS protocol.
+
By default, false.

[[auth.emailFormat]]auth.emailFormat::
+
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.

[[auth.contributorAgreements]]auth.contributorAgreements::
+
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 insert one or more rows into
`contributor_agreements` 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).

auth.allowGoogleAccountUpgrade::
+
Allows Google Account users to automatically update their Gerrit
account when/if their Google Account OpenID identity token changes.
Identity tokens can change if the server changes hostnames, or
for other reasons known only to Google.  The upgrade path works
by matching users by email address if the identity is not present,
and then changing the identity.
+
This setting also permits old Gerrit 1.x users to seamlessly upgrade
from Google Accounts on Google App Engine to OpenID authentication.
+
Having this enabled incurs an extra database query when Google
Account users register with the Gerrit server.
+
By default, unset/false.

[[auth.trustContainerAuth]]auth.trustContainerAuth::
+
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 DIGEST authentication).
+
By default this is set to false.

[[auth.gitBasicAuth]]auth.gitBasicAuth::
+
If true then Git over HTTP and HTTP/S traffic is authenticated using
standard BasicAuth and credentials validated using the same auth
method configured for Gerrit Web UI.
+
This parameter only affects git over http traffic. If set to false
then Gerrit will authenticate through DIGEST authentication and
the randomly generated HTTP password in Gerrit DB.
+
By default this is set to false.

[[auth.userNameToLowerCase]]auth.userNameToLowerCase::
+
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 link:#ldap.accountSshUserName[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.
+
This parameter only affects git over http and git over SSH traffic.
+
By default this is set to false.

[[cache]]Section cache
~~~~~~~~~~~~~~~~~~~~~~

[[cache.directory]]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]]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, `minutes` 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]]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]]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.

[[cache_names]]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 `"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_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.

See also link:cmd-flush-caches.html[gerrit flush-caches].

[[cache_options]]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 and no intraline difference is displayed.
+
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.
Administrators may force the cache to flush with
link:cmd-flush-caches.html[gerrit flush-caches].
+
Default is 5 minutes.

[[changeMerge]]Section changeMerge
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.

----
[changeMerge]
  test = true
----

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

[[commentlink]]Section commentlink
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Comment links are find/replace strings applied to change descriptions,
patch comments, and in-line code comments 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>
----

[[commentlink.name.match]]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]]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]]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.


[[contactstore]]Section contactstore
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[[contactstore.url]]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 link:config-contact.html[Contact Information].

[[contactstore.appsec]]contactstore.appsec::
+
Shared secret of the web based contact store.


[[container]]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]]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]]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]]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]]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]]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]]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'.


[[core]]Section core
~~~~~~~~~~~~~~~~~~~~

[[core.packedGitWindowSize]]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]]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.deltaBaseCaseLimit]]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]]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]]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]]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]]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.

[[database]]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]]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]]database.hostname::
+
Hostname of the database server.  Defaults to 'localhost'.

[[database.port]]database.port::
+
Port number of the database server.  Defaults to the default port
of the server named by database.type.

[[database.database]]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]]database.username::
+
Username to connect to the database server as.

[[database.password]]database.password::
+
Password to authenticate to the database server with.

[[database.driver]]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]]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.poolLimit]]database.poolLimit::
+
Maximum number of open database connections.  If the server needs
more than this number, request processing threads will wait up
to <<database.poolMaxWait, 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.

[[database.poolMinIdle]]database.poolMinIdle::
+
Minimum number of connections to keep idle in the pool.
Default is 4.

[[database.poolMaxIdle]]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.

[[database.poolMaxWait]]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`.

[[download]]Section download
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

----
[download]
  scheme = ssh
  scheme = http
  scheme = anon_http
  scheme = anon_git
  scheme = repo_download
----

The download section configures the allowed download methods.

[[download.scheme]]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,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.

[[gerrit]]Section gerrit
~~~~~~~~~~~~~~~~~~~~~~~~

[[gerrit.basePath]]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]]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]]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]]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]]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.

[[gitweb]]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 link:config-gitweb.html[Gitweb Integration].

[[gitweb.cgi]]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]]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]]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]]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]]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]]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]]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]]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]]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 link:http://gitblit.com[Gitblit],
allow using an alternative path separator character. In Gitblit, this can be
configured through the property link:http://gitblit.com/properties.html[web.forwardSlashCharacter].
In Gerrit, the alternative path separator can be configured correspondingly
using the property 'gitweb.pathSeparator'.
+
Valid values are the characters '*', '(' and ')'.

[[hooks]]Section hooks
~~~~~~~~~~~~~~~~~~~~~~

See also link:config-hooks.html[Hooks].

[[hooks.path]]hooks.path::
+
Optional path to hooks, if not specified then `'$site_path'/hooks` will be used.

[[hooks.patchsetCreatedHook]]hooks.patchsetCreatedHook::
+
Optional filename for the patchset created hook, if not specified then
`patchset-created` will be used.

[[hooks.draftPublishedHook]]hooks.draftPublishedHook::
+
Optional filename for the draft published hook, if not specified then
`draft-published` will be used.

[[hooks.commentAddedHook]]hooks.commentAddedHook::
+
Optional filename for the comment added hook, if not specified then
`comment-added` will be used.

[[hooks.changeMergedHook]]hooks.changeMergedHook::
+
Optional filename for the change merged hook, if not specified then
`change-merged` will be used.

[[hooks.changeAbandonedHook]]hooks.changeAbandonedHook::
+
Optional filename for the change abandoned hook, if not specified then
`change-abandoned` will be used.

[[hooks.changeRestoredHook]]hooks.changeRestoredHook::
+
Optional filename for the change restored hook, if not specified then
`change-restored` will be used.

[[hooks.refUpdatedHook]]hooks.refUpdatedHook::
+
Optional filename for the ref updated hook, if not specified then
`ref-updated` will be used.

[[hooks.claSignedHook]]hooks.claSignedHook::
+
Optional filename for the CLA signed hook, if not specified then
`cla-signed` will be used.

[[http]]Section http
~~~~~~~~~~~~~~~~~~~~

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

[[http.proxyUsername]]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]]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.


[[httpd]]Section httpd
~~~~~~~~~~~~~~~~~~~~~~

The httpd section configures the embedded servlet container.

[[httpd.listenUrl]]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
link:http://httpd.apache.org/docs/2.2/mod/mod_proxy.html#x-headers[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]]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]]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]]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]]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]]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]]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]]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]]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]]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]]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.


[[ldap]]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
link:http://www.ietf.org/rfc/rfc2307.txt[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]]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…