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---
stage: Enablement
group: Distribution
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
type: reference
---
# Environment variables
GitLab exposes certain environment variables which can be used to override
their defaults values.
People usually configure GitLab with `/etc/gitlab/gitlab.rb` for Omnibus
installations, or `gitlab.yml` for installations from source.
You can use the following environment variables to override certain values:
## Supported environment variables
| Variable | Type | Description |
|--------------------------------------------|---------|---------------------------------------------------------------------------------------------------------|
| `DATABASE_URL` | string | The database URL; is of the form: `postgresql://localhost/blog_development`. |
| `ENABLE_BOOTSNAP` | string | Enables Bootsnap for speeding up initial Rails boot (`1` to enable). |
| `GITLAB_CDN_HOST` | string | Sets the base URL for a CDN to serve static assets (for example, `//mycdnsubdomain.fictional-cdn.com`). |
| `GITLAB_EMAIL_DISPLAY_NAME` | string | The name used in the **From** field in emails sent by GitLab. |
| `GITLAB_EMAIL_FROM` | string | The email address used in the **From** field in emails sent by GitLab. |
| `GITLAB_EMAIL_REPLY_TO` | string | The email address used in the **Reply-To** field in emails sent by GitLab. |
| `GITLAB_EMAIL_SUBJECT_SUFFIX` | string | The email subject suffix used in emails sent by GitLab. |
| `GITLAB_HOST` | string | The full URL of the GitLab server (including `http://` or `https://`). |
| `GITLAB_ROOT_PASSWORD` | string | Sets the password for the `root` user on installation. |
| `GITLAB_SHARED_RUNNERS_REGISTRATION_TOKEN` | string | Sets the initial registration token used for runners. |
| `GITLAB_UNICORN_MEMORY_MAX` | integer | The maximum memory threshold (in bytes) for the [unicorn-worker-killer](operations/unicorn.md#unicorn-worker-killer). |
| `GITLAB_UNICORN_MEMORY_MIN` | integer | The minimum memory threshold (in bytes) for the [unicorn-worker-killer](operations/unicorn.md#unicorn-worker-killer). |
| `RAILS_ENV` | string | The Rails environment; can be one of `production`, `development`, `staging`, or `test`. |
| `UNSTRUCTURED_RAILS_LOG` | string | Enables the unstructured log in addition to JSON logs (defaults to `true`). |
## Complete database variables
The recommended method for specifying your database connection information is
to set the `DATABASE_URL` environment variable. This variable contains
connection information (`adapter`, `database`, `username`, `password`, `host`,
and `port`), but no behavior information (`encoding` or `pool`). If you don't
want to use `DATABASE_URL`, or want to set database behavior information,
either:
- Copy the template file, `cp config/database.yml.env config/database.yml`.
- 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` | **{check-circle}** Yes |
| `GITLAB_DATABASE_DATABASE` | `gitlab_#{ENV['RAILS_ENV']` | **{check-circle}** Yes |
| `GITLAB_DATABASE_ENCODING` | `unicode` | **{dotted-circle}** No |
| `GITLAB_DATABASE_HOST` | `localhost` | **{check-circle}** Yes |
| `GITLAB_DATABASE_PASSWORD` | _none_ | **{check-circle}** Yes |
| `GITLAB_DATABASE_POOL` | `10` | **{dotted-circle}** No |
| `GITLAB_DATABASE_PORT` | `5432` | **{check-circle}** Yes |
| `GITLAB_DATABASE_USERNAME` | `root` | **{check-circle}** Yes |
## Adding more variables
We welcome merge requests to make more settings configurable by using variables.
Make changes to the `config/initializers/1_settings.rb` file, and use 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 [Pre-configure Docker container](https://docs.gitlab.com/omnibus/docker/#pre-configure-docker-container)
section of the Omnibus GitLab documentation.
|
