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# Environment Variables
GitLab exposes certain environment variables which can be used to override
their defaults values.
People usually configure GitLab via `/etc/gitlab/gitlab.rb` for Omnibus
installations, or `gitlab.yml` for installations from source.
Below you will find the supported environment variables which you can use to
override certain values.
## Supported environment variables
Variable | Type | Description
-------- | ---- | -----------
`GITLAB_CDN_HOST` | string | Sets the base URL for a CDN to serve static assets (e.g. `//mycdnsubdomain.fictional-cdn.com`)
`GITLAB_ROOT_PASSWORD` | string | Sets the password for the `root` user on installation
`GITLAB_HOST` | string | The full URL of the GitLab server (including `http://` or `https://`)
`RAILS_ENV` | string | The Rails environment; can be one of `production`, `development`, `staging` or `test`
`DATABASE_URL` | string | The database URL; is of the form: `postgresql://localhost/blog_development`
`GITLAB_EMAIL_FROM` | string | The e-mail address used in the "From" field in e-mails sent by GitLab
`GITLAB_EMAIL_DISPLAY_NAME` | string | The name used in the "From" field in e-mails sent by GitLab
`GITLAB_EMAIL_REPLY_TO` | string | The e-mail address used in the "Reply-To" field in e-mails sent by GitLab
`GITLAB_EMAIL_SUBJECT_SUFFIX` | string | The e-mail subject suffix used in e-mails sent by GitLab
`GITLAB_UNICORN_MEMORY_MIN` | integer | The minimum memory threshold (in bytes) for the Unicorn worker killer
`GITLAB_UNICORN_MEMORY_MAX` | integer | The maximum memory threshold (in bytes) for the Unicorn worker killer
`GITLAB_SHARED_RUNNERS_REGISTRATION_TOKEN` | string | Sets the initial registration token used for GitLab Runners
## Complete database variables
The recommended way of specifying your database connection information is to set
the `DATABASE_URL` environment variable. This variable only holds connection
information (`adapter`, `database`, `username`, `password`, `host` and `port`),
but not behavior information (`encoding`, `pool`). If you don't want to use
`DATABASE_URL` and/or want to set database behavior information, you will have
to either:
- copy our template file: `cp config/database.yml.env config/database.yml`, or
- set a value for some `GITLAB_DATABASE_XXX` variables
The list of `GITLAB_DATABASE_XXX` variables that you can set is:
Variable | Default value | Overridden by `DATABASE_URL`?
-------- | ------------- | -----------------------------
`GITLAB_DATABASE_ADAPTER` | `postgresql` (for MySQL use `mysql2`) | Yes
`GITLAB_DATABASE_DATABASE` | `gitlab_#{ENV['RAILS_ENV']` | Yes
`GITLAB_DATABASE_USERNAME` | `root` | Yes
`GITLAB_DATABASE_PASSWORD` | None | Yes
`GITLAB_DATABASE_HOST` | `localhost` | Yes
`GITLAB_DATABASE_PORT` | `5432` | Yes
`GITLAB_DATABASE_ENCODING` | `unicode` | No
`GITLAB_DATABASE_POOL` | `10` | No
## Adding more variables
We welcome merge requests to make more settings configurable via variables.
Please make changes in the `config/initializers/1_settings.rb` file and stick
to the naming scheme `GITLAB_#{name in 1_settings.rb in upper case}`.
## Omnibus configuration
To set environment variables, follow [these
instructions](https://docs.gitlab.com/omnibus/settings/environment-variables.html).
It's possible to preconfigure the GitLab docker image by adding the environment
variable `GITLAB_OMNIBUS_CONFIG` to the `docker run` command.
For more information see the ['preconfigure-docker-container' section in the Omnibus documentation](http://docs.gitlab.com/omnibus/docker/#preconfigure-docker-container).
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