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GitLab Mattermost

NOTE: This document applies to GitLab 11.0 and later.

You can run a GitLab Mattermost service on your GitLab server. Mattermost is not part of the single application that GitLab is. There is a good integration between with GitLab, and our Omnibus installer allows you to easily install it. But it is a separate application from a separate company.

Prerequisites

Each release of GitLab Mattermost is compiled and manually tested on an AMD 64 chipset for Linux. ARM chipsets and operating systems, like Raspberry Pi, are not supported.

Getting started

GitLab Mattermost expects to run on its own virtual host. In your DNS settings, you need two entries pointing to the same machine. For example, gitlab.example.com and mattermost.example.com.

GitLab Mattermost is disabled by default. To enable it:

Edit /etc/gitlab/gitlab.rb and add the Mattermost external URL:
```
mattermost_external_url 'https://mattermost.example.com'
```
Reconfigure GitLab:
```
sudo gitlab-ctl reconfigure
```
Confirm that GitLab Mattermost is reachable at https://mattermost.example.com and authorized to connect to GitLab. Authorizing Mattermost with GitLab allows users to use GitLab as an SSO provider.

The Omnibus GitLab package attempts to automatically authorize GitLab Mattermost with GitLab if the applications are running on the same server.

Automatic authorization requires access to the GitLab database. If the GitLab database is not available you need to manually authorize GitLab Mattermost for access to GitLab using the process described in the Authorize GitLab Mattermost section.

Configuring Mattermost

Starting in GitLab 11.0, Mattermost can be configured using the Mattermost System Console. An extensive list of Mattermost settings and where they can be set is available in the Mattermost documentation.

While using the System Console is recommended, you can also configure Mattermost using one of the following options:

Edit the Mattermost configuration directly through /var/opt/gitlab/mattermost/config.json.
Specify environment variables used to run Mattermost by changing the mattermost['env'] setting in gitlab.rb. Any settings configured in this way are disabled from the System Console and cannot be changed without restarting Mattermost.

Running GitLab Mattermost with HTTPS

Place the SSL certificate and SSL certificate key inside /etc/gitlab/ssl. If the directory doesn't exist, create it:

sudo mkdir -p /etc/gitlab/ssl
sudo chmod 755 /etc/gitlab/ssl
sudo cp mattermost.gitlab.example.key mattermost.gitlab.example.crt /etc/gitlab/ssl/

In /etc/gitlab/gitlab.rb specify the following configuration:

mattermost_external_url 'https://mattermost.gitlab.example'
mattermost_nginx['redirect_http_to_https'] = true

If you haven't named your certificate and key mattermost.gitlab.example.crt and mattermost.gitlab.example.key then you need to also add the full paths as shown below.

mattermost_nginx['ssl_certificate'] = "/etc/gitlab/ssl/mattermost-nginx.crt"
mattermost_nginx['ssl_certificate_key'] = "/etc/gitlab/ssl/mattermost-nginx.key"

where mattermost-nginx.crt and mattermost-nginx.key are SSL cert and key, respectively.

Once the configuration is set, run sudo gitlab-ctl reconfigure to apply the changes.

Running GitLab Mattermost on its own server

If you want to run GitLab and GitLab Mattermost on two separate servers the GitLab services are still set up on your GitLab Mattermost server, but they do not accept user requests or consume system resources. You can use the following settings and configuration details on the GitLab Mattermost server to effectively disable the GitLab service bundled into the Omnibus package.

mattermost_external_url 'http://mattermost.example.com'

# Shut down GitLab services on the Mattermost server
gitlab_rails['enable'] = false
redis['enable'] = false
postgres_exporter['enable'] = false
grafana['enable'] = false

Then follow the appropriate steps in the Authorize GitLab Mattermost section. Last, to enable integrations with GitLab add the following on the GitLab Server:

gitlab_rails['mattermost_host'] = "https://mattermost.example.com"

By default GitLab Mattermost requires all users to sign up with GitLab and disables the sign-up by email option. See Mattermost documentation on GitLab SSO.

Manually (re)authorizing GitLab Mattermost with GitLab

Reauthorize GitLab Mattermost

To reauthorize GitLab Mattermost, you first need to revoke the existing authorization. This can be done in the Settings > Applications area of GitLab. Then follow the steps below to complete authorization.

Authorize GitLab Mattermost

Navigate to the Settings > Applications area in GitLab. Create a new application and for the Redirect URI use the following (replace http with https if you use HTTPS):

http://mattermost.example.com/signup/gitlab/complete
http://mattermost.example.com/login/gitlab/complete

Note that you do not need to select any options under Scopes. Choose Save application.

Once the application is created you are provided with an Application ID and Secret. One other piece of information needed is the URL of GitLab instance. Return to the server running GitLab Mattermost and edit the /etc/gitlab/gitlab.rb configuration file as follows using the values you received above:

mattermost['gitlab_enable'] = true
mattermost['gitlab_id'] = "12345656"
mattermost['gitlab_secret'] = "123456789"
mattermost['gitlab_scope'] = ""
mattermost['gitlab_auth_endpoint'] = "http://gitlab.example.com/oauth/authorize"
mattermost['gitlab_token_endpoint'] = "http://gitlab.example.com/oauth/token"
mattermost['gitlab_user_api_endpoint'] = "http://gitlab.example.com/api/v4/user"

Save the changes and then run sudo gitlab-ctl reconfigure. If there are no errors your GitLab and GitLab Mattermost should be configured correctly.

Specify numeric user and group identifiers

Omnibus GitLab creates a user and group mattermost. You can specify the numeric identifiers for these users in /etc/gitlab/gitlab.rb as follows:

mattermost['uid'] = 1234
mattermost['gid'] = 1234

Run sudo gitlab-ctl reconfigure to apply the changes.

Setting custom environment variables

If necessary you can set custom environment variables to be used by Mattermost via /etc/gitlab/gitlab.rb. This can be useful if the Mattermost server is operated behind a corporate internet proxy. In /etc/gitlab/gitlab.rb supply a mattermost['env'] with a hash value. For example:

mattermost['env'] = {"HTTP_PROXY" => "my_proxy", "HTTPS_PROXY" => "my_proxy", "NO_PROXY" => "my_no_proxy"}

Run sudo gitlab-ctl reconfigure to apply the changes.

Connecting to the bundled PostgreSQL database

If you need to connect to the bundled PostgreSQL database and are using the default Omnibus GitLab database configuration, you can connect as the PostgreSQL superuser:

sudo gitlab-psql -d mattermost_production

Back up GitLab Mattermost

GitLab Mattermost is not included in the regular Omnibus GitLab backup Rake task.

The general Mattermost backup and disaster recovery documentation can be used as a guide on what needs to be backed up.

Back up the bundled PostgreSQL database

If you need to back up the bundled PostgreSQL database and are using the default Omnibus GitLab database configuration, you can back up using this command:

sudo -i -u gitlab-psql -- /opt/gitlab/embedded/bin/pg_dump -h /var/opt/gitlab/postgresql mattermost_production | gzip > mattermost_dbdump_$(date --rfc-3339=date).sql.gz

Back up the `data` directory and `config.json`

Mattermost has a data directory and config.json file that need to be backed up as well:

sudo tar -zcvf mattermost_data_$(date --rfc-3339=date).gz -C /var/opt/gitlab/mattermost data config.json

Restore GitLab Mattermost

If you have previously created a backup of GitLab Mattermost, you can run the following commands to restore it:

# Stop Mattermost so we don't have any open database connections
sudo gitlab-ctl stop mattermost

# Drop the Mattermost database
sudo -u gitlab-psql /opt/gitlab/embedded/bin/dropdb -U gitlab-psql -h /var/opt/gitlab/postgresql -p 5432 mattermost_production

# Create the Mattermost database
sudo -u gitlab-psql /opt/gitlab/embedded/bin/createdb -U gitlab-psql -h /var/opt/gitlab/postgresql -p 5432 mattermost_production

# Perform the database restore
# Replace /tmp/mattermost_dbdump_2021-08-05.sql.gz with your backup
sudo -u mattermost sh -c "zcat /tmp/mattermost_dbdump_2021-08-05.sql.gz | /opt/gitlab/embedded/bin/psql -U gitlab_mattermost -h /var/opt/gitlab/postgresql -p 5432 mattermost_production"

# Restore the data directory and config.json
# Replace /tmp/mattermost_data_2021-08-09.gz with your backup
sudo tar -xzvf /tmp/mattermost_data_2021-08-09.gz -C /var/opt/gitlab/mattermost

# Fix permissions if required
sudo chown -R mattermost:mattermost /var/opt/gitlab/mattermost/data
sudo chown mattermost:mattermost /var/opt/gitlab/mattermost/config.json

# Start Mattermost
sudo gitlab-ctl start mattermost

Mattermost Command Line Tools (CLI)

NOTE: This CLI will be replaced in a future release with the new mmctl Command Line Tool.

To use the Mattermost Command Line Tools (CLI), ensure that you are in the /opt/gitlab/embedded/service/mattermost directory when you run the CLI commands and that you specify the location of the configuration file. The executable is /opt/gitlab/embedded/bin/mattermost.

cd /opt/gitlab/embedded/service/mattermost

sudo /opt/gitlab/embedded/bin/chpst -e /opt/gitlab/etc/mattermost/env -P -U mattermost:mattermost -u mattermost:mattermost /opt/gitlab/embedded/bin/mattermost --config=/var/opt/gitlab/mattermost/config.json version

Until #4745 has been implemented, the command requires quite of bit typing and is hard to remember, so let's make a bash or Zsh alias to make it a bit easier to remember. Add the following to your ~/.bashrc or ~/.zshrc file:

alias mattermost-cli="cd /opt/gitlab/embedded/service/mattermost && sudo /opt/gitlab/embedded/bin/chpst -e /opt/gitlab/etc/mattermost/env -P -U mattermost:mattermost -u mattermost:mattermost /opt/gitlab/embedded/bin/mattermost --config=/var/opt/gitlab/mattermost/config.json $1"

Then source ~/.zshrc or ~/.bashrc with source ~/.zshrc or source ~/.bashrc.

If successful, you can now run any Mattermost CLI command with your new shell alias mattermost-cli:

$ mattermost-cli version

[sudo] password for username:
{"level":"info","ts":1569614421.9058893,"caller":"utils/i18n.go:83","msg":"Loaded system translations for 'en' from '/opt/gitlab/embedded/service/mattermost/i18n/en.json'"}
{"level":"info","ts":1569614421.9062793,"caller":"app/server_app_adapters.go:58","msg":"Server is initializing..."}
{"level":"info","ts":1569614421.90976,"caller":"sqlstore/supplier.go:223","msg":"Pinging SQL master database"}
{"level":"info","ts":1569614422.0515099,"caller":"mlog/log.go:165","msg":"Starting up plugins"}
{"level":"info","ts":1569614422.0515954,"caller":"app/plugin.go:193","msg":"Syncing plugins from the file store"}
{"level":"info","ts":1569614422.086005,"caller":"app/plugin.go:228","msg":"Found no files in plugins file store"}
{"level":"info","ts":1569614423.9337213,"caller":"sqlstore/post_store.go:1301","msg":"Post.Message supports at most 16383 characters (65535 bytes)"}
{"level":"error","ts":1569614425.6317747,"caller":"go-plugin/stream.go:15","msg":" call to OnConfigurationChange failed, error: Must have a GitLab oauth client id","plugin_id":"com.github.manland.mattermost-plugin-gitlab","source":"plugin_stderr"}
{"level":"info","ts":1569614425.6875598,"caller":"mlog/sugar.go:19","msg":"Ensuring Surveybot exists","plugin_id":"com.mattermost.nps"}
{"level":"info","ts":1569614425.6953356,"caller":"app/server.go:216","msg":"Current version is 5.14.0 (5.14.2/Fri Aug 30 20:20:48 UTC 2019/817ee89711bf26d33f840ce7f59fba14da1ed168/none)"}
{"level":"info","ts":1569614425.6953766,"caller":"app/server.go:217","msg":"Enterprise Enabled: false"}
{"level":"info","ts":1569614425.6954057,"caller":"app/server.go:219","msg":"Current working directory is /opt/gitlab/embedded/service/mattermost/i18n"}
{"level":"info","ts":1569614425.6954265,"caller":"app/server.go:220","msg":"Loaded config","source":"file:///var/opt/gitlab/mattermost/config.json"}
Version: 5.14.0
Build Number: 5.14.2
Build Date: Fri Aug 30 20:20:48 UTC 2019
Build Hash: 817ee89711bf26d33f840ce7f59fba14da1ed168
Build Enterprise Ready: false
DB Version: 5.14.0

For more details see Mattermost Command Line Tools (CLI) and the Troubleshooting Mattermost CLI below.

Configuring GitLab and Mattermost integrations

As of 12.3, the Mattermost GitLab plugin is shipped with Omnibus GitLab: Mattermost Plugin for GitLab documentation.

You can use the plugin to subscribe Mattermost to receive notifications about issues, merge requests, and pull requests as well as personal notifications regarding merge request reviews, unread messages, and task assignments. If you want to use slash commands to perform actions such as creating and viewing issues, or to trigger deployments use GitLab Mattermost slash commands.

The plugin and slash commands can be used together or individually.

Email Notifications

Setting up SMTP for GitLab Mattermost

These settings are configured through the Mattermost System Console by the System Administrator. On the Environment > SMTP tab of the System Console, you can enter the SMTP credentials given by your SMTP provider, or 127.0.0.1 and port 25 to use sendmail. More information on the specific settings that are needed is available in the Mattermost documentation.

These settings can also be configured in /var/opt/gitlab/mattermost/config.json.

Email batching

Enabling this feature allows users to control how often they receive email notifications.

Email batching can be enabled in the Mattermost System Console by going to the Environment > SMTP tab, and setting the Enable Email Batching setting to True.

This setting can also be configured in /var/opt/gitlab/mattermost/config.json.

Upgrading GitLab Mattermost

Below is a list of Mattermost versions for GitLab 11.10 and later:

GitLab Version	Mattermost Version
11.11	5.10
12.0	5.11
12.1	5.12
12.2	5.13
12.3	5.14
12.4	5.15
12.5	5.16
12.6	5.17
12.7	5.17
12.8	5.19
12.9	5.20
12.10	5.21
13.0	5.22
13.1	5.23
13.2	5.24
13.3	5.25
13.4	5.26
13.5	5.27
13.6	5.28
13.7	5.29
13.8	5.30
13.9	5.31
13.10	5.32
13.11	5.33
13.12	5.34
14.0	5.35
14.1	5.36
14.2	5.37
14.3	5.38
14.4	5.39
14.5	5.39
14.6	6.1
14.7	6.2

GitLab 14.5 remained on Mattermost 5.39
GitLab 14.6 updates to Mattermost 6.1 instead of 6.0

NOTE: When upgrading the Mattermost version, it is essential to check the Important Upgrade Notes for Mattermost to address any changes or migrations that need to be performed.

Starting with GitLab 11.0, GitLab Mattermost can be upgraded through the regular Omnibus GitLab update process. When upgrading previous versions of GitLab, the update process can only be used if Mattermost configuration settings have not been changed outside of GitLab. That is, no changes to Mattermost's config.json file have been made - either directly or via the Mattermost System Console, which saves changes to config.json.

If you are upgrading to at least GitLab 11.0 or have only configured Mattermost using gitlab.rb, you can upgrade GitLab using Omnibus and then run gitlab-ctl reconfigure to upgrade GitLab Mattermost to the latest version.

If this is not the case, there are two options:

Update gitlab.rb with the changes done to config.json. This might require adding some parameters as not all settings in config.json are available in gitlab.rb. Once complete, Omnibus GitLab should be able to upgrade GitLab Mattermost from one version to the next.
Migrate Mattermost outside of the directory controlled by Omnibus GitLab so it can be administered and upgraded independently. Follow the Mattermost Migration Guide to move your Mattermost configuration settings and data to another directory or server independent from Omnibus GitLab.

For a complete list of upgrade notices and special considerations for older versions, see the Mattermost documentation.

Upgrading GitLab Mattermost to 14.6

GitLab 14.6 ships with Mattermost 6.1 including potentially long running database migrations for Mattermost 6.0. For information about upgrading and for ways to reduce the downtime caused by those migrations, read the Important Upgrade Notes for both versions. If you need to perform any manual migrations, connect to the bundled PostgreSQL database.

NOTE: The Mattermost upgrade notes refer to different impacts when used with a PostgreSQL versus a MySQL database. The GitLab Mattermost included with the GitLab Linux packages uses a PostgreSQL database.

Upgrading GitLab Mattermost from versions prior to 11.0

With version 11.0, GitLab introduced breaking changes which affected Mattermost configuration. In versions prior to GitLab 11.0 all Mattermost-related settings were configurable from the gitlab.rb file, which generated the Mattermost config.json file. However, Mattermost also permitted configuration via its System Console. This configuration ended up in the same config.json file, which resulted in changes made via the System Console being overwritten when users ran gitlab-ctl reconfigure.

To resolve this problem, gitlab.rb includes only the configuration necessary for GitLab<=>Mattermost integration in 11.0. GitLab no longer generates the config.json file, and instead passes limited configuration settings via environment variables.

The settings that continue to be supported in gitlab.rb can be found in gitlab.rb.template.

From GitLab 11.0, other Mattermost settings can be configured through Mattermost's System Console, by editing /var/opt/gitlab/mattermost/config.json, or by using mattermost['env'] in gitlab.rb.

If you would like to keep configuring Mattermost using gitlab.rb, you can take the following actions in preparation for GitLab 11.0:

Upgrade to version 10.x which supports the new mattermost['env'] setting.
Configure any settings not listed above through the mattermost['env'] setting. Mattermost requires environment variables to be provided in MM_<CATEGORY>SETTINGS_<ATTRIBUTE> format. Below is an example of how to convert the old settings syntax to the new one.

The following settings in gitlab.rb:

mattermost['service_maximum_login_attempts'] = 10
mattermost['team_teammate_name_display'] = "full_name"
mattermost['sql_max_idle_conns'] = 10
mattermost['log_file_level'] = 'INFO'
mattermost['email_batching_interval'] = 30
mattermost['file_enable_file_attachments'] = true
mattermost['ratelimit_memory_store_size'] = 10000
mattermost['support_terms_of_service_link'] = "/static/help/terms.html"
mattermost['privacy_show_email_address'] = true
mattermost['localization_available_locales'] = "en,es,fr,ja,pt-BR"
mattermost['webrtc_enable'] = false

Would translate to:

mattermost['env'] = {
                    'MM_SERVICESETTINGS_MAXIMUMLOGINATTEMPTS' => '10',
                    'MM_TEAMSETTINGS_TEAMMATENAMEDISPLAY' => 'full_name',
                    'MM_SQLSETTINGS_MAXIDLECONNS' => '10',
                    'MM_LOGSETTINGS_FILELEVEL' => 'INFO',
                    'MM_EMAILSETTINGS_BATCHINGINTERVAL' => '30',
                    'MM_FILESETTINGS_ENABLEFILEATTACHMENTS' => 'true',
                    'MM_RATELIMITSETTINGS_MEMORYSTORESIZE' => '10000',
                    'MM_SUPPORTSETTINGS_TERMSOFSERVICELINK' => '/static/help/terms.html',
                    'MM_PRIVACYSETTINGS_SHOWEMAILADDRESS' => 'true',
                    'MM_LOCALIZATIONSETTINGS_AVAILABLELOCALES' => 'en,es,fr,ja,pt-BR',
                    'MM_WEBRTCSETTINGS_ENABLE' => 'false'
                    }

Refer to the Mattermost Configuration Settings documentation for details about categories and configuration values.

There are a few exceptions to this rule:

ServiceSettings.ListenAddress configuration of Mattermost is configured by mattermost['service_address'] and mattermost['service_port'] settings.
Configuration settings named in an inconsistent way are given in the following table. Use these mappings when converting them to environment variables.

`gitlab.rb` configuration	Environment variable
`mattermost['service_lets_encrypt_cert_cache_file']`	`MM_SERVICESETTINGS_LETSENCRYPTCERTIFICATECACHEFILE`
`mattermost['service_user_access_tokens']`	`MM_SERVICESETTINGS_ENABLEUSERACCESSTOKENS`
`mattermost['log_console_enable']`	`MM_LOGSETTINGS_ENABLECONSOLE`
`mattermost['email_enable_batching']`	`MM_EMAILSETTINGS_ENABLEEMAILBATCHING`
`mattermost['email_batching_buffer_size']`	`MM_EMAILSETTINGS_EMAILBATCHINGBUFFERSIZE`
`mattermost['email_batching_interval']`	`MM_EMAILSETTINGS_EMAILBATCHINGINTERVAL`
`mattermost['email_smtp_auth']`	`MM_EMAILSETTINGS_ENABLESMTPAUTH`
`mattermost['email_notification_content_type']`	`MM_EMAILSETTINGS_NOTIFICATIONCONTENTTYPE`
`mattermost['ratelimit_enable_ratelimiter']`	`MM_RATELIMITSETTINGS_ENABLE`
`mattermost['support_email']`	`MM_SUPPORTSETTINGS_SUPPORTEMAIL`
`mattermost['localization_server_locale']`	`MM_LOCALIZATIONSETTINGS_DEFAULTSERVERLOCALE`
`mattermost['localization_client_locale']`	`MM_LOCALIZATIONSETTINGS_DEFAULTCLIENTLOCALE`
`mattermost['webrtc_gateway_stun_uri']`	`MM_WEBRTCSETTINGS_STUN_URI`
`mattermost['webrtc_gateway_turn_uri']`	`MM_WEBRTCSETTINGS_TURN_URI`
`mattermost['webrtc_gateway_turn_username']`	`MM_WEBRTCSETTINGS_TURN_USERNAME`
`mattermost['webrtc_gateway_turn_sharedkey']`	`MM_WEBRTCSETTINGS_TURN_SHAREDKEY`

NOTE: GitLab 11.0 no longer generates config.json file from the configuration specified in gitlab.rb. Users are responsible for managing this file which can be done via the Mattermost System Console or manually. If a configuration setting is specified via both the gitlab.rb (as an environment variable) and config.json files, the environment variable gets precedence.

If you encounter any issues visit the GitLab Mattermost troubleshooting forum and share any relevant portions of mattermost.log along with the step at which you encountered issues.

Upgrading GitLab Mattermost outside of GitLab

If you choose to upgrade Mattermost outside of the Omnibus GitLab automation, follow this guide.

OAuth2 sequence diagram

The following image is a sequence diagram for how GitLab works as an OAuth2 provider for Mattermost. You can use this to troubleshoot errors in getting the integration to work:

sequenceDiagram
    User->>Mattermost: GET https://mm.domain.com
    Note over Mattermost, GitLab: Obtain access code
    Mattermost->>GitLab: GET https://gitlab.domain.com/oauth/authorize
    Note over User, GitLab: GitLab user signs in (if necessary)
    Note over GitLab: GitLab verifies client_id matches an OAuth application
    GitLab->>User: GitLab asks user to authorize Mattermost OAuth app
    User->>GitLab: User selects 'Allow'
    Note over GitLab: GitLab verifies redirect_uri matches list of valid URLs
    GitLab->>User: 302 redirect: https://mm.domain.com/signup/gitlab/complete
    User->>Mattermost: GET https://mm.domain.com/signup/gitlab/complete
    Note over Mattermost, GitLab: Exchange access code for access token
    Mattermost->>GitLab: POST http://gitlab.domain.com/oauth/token
    GitLab->>GitLab: Doorkeeper::TokensController#35;create
    GitLab->>Mattermost: Access token
    Note over Mattermost, GitLab: Mattermost looks up GitLab user
    Mattermost->>GitLab: GET https://gitlab.domain.com/api/v4/user
    GitLab->>Mattermost: User details
    Mattermost->>User: Mattermost/GitLab user ready

Troubleshooting the Mattermost CLI

Failed to ping DB retrying in 10 seconds err=dial tcp: lookup dockerhost: no such host

As of version 11.0, majority of the Mattermost settings are now configured via environmental variables. The error is mainly due to the database connection string being commented out in gitlab.rb and the database connection settings being set in environmental variables. Additionally, the connection string in the gitlab.rb is for MySQL which is no longer supported as of 12.1.

You can fix this by setting up a mattermost-cli shell alias.

Community support resources

For help and support around your GitLab Mattermost deployment please see:

Troubleshooting Forum for configuration questions and issues.
Troubleshooting FAQ.
Mattermost GitLab Issues Support Handbook.
GitLab Mattermost issue tracker for verified bugs with repro steps.

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