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# Environment Variables
## Introduction
Commonly people configure GitLab via the gitlab.rb configuration file in the Omnibus package.
But if you prefer to use environment variables we allow that too.
## Supported environment variables
Variable | Type | Explanation
-------- | ---- | -----------
GITLAB_ROOT_PASSWORD | string | sets the password for the `root` user on installation
GITLAB_HOST | url | hostname of the GitLab server includes http or https
RAILS_ENV | production / development / staging / test | Rails environment
DATABASE_URL | url | For example: postgresql://localhost/blog_development?pool=5
GITLAB_EMAIL_FROM | email | Email address used in the "From" field in mails sent by GitLab
GITLAB_EMAIL_DISPLAY_NAME | string | Name used in the "From" field in mails sent by GitLab
GITLAB_EMAIL_REPLY_TO | email | Email address used in the "Reply-To" field in 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
## Complete database variables
As explained in the [Heroku documentation](https://devcenter.heroku.com/articles/rails-database-connection-behavior) the DATABASE_URL doesn't let you set:
- adapter
- database
- username
- password
- host
- port
To do so please `cp config/database.yml.env config/database.yml` and use the following variables:
Variable | Default
--- | ---
GITLAB_DATABASE_ADAPTER | postgresql
GITLAB_DATABASE_ENCODING | unicode
GITLAB_DATABASE_DATABASE | gitlab_#{ENV['RAILS_ENV']
GITLAB_DATABASE_POOL | 10
GITLAB_DATABASE_USERNAME | root
GITLAB_DATABASE_PASSWORD |
GITLAB_DATABASE_HOST | localhost
GITLAB_DATABASE_PORT | 5432
## Adding more variables
We welcome merge requests to make more settings configurable via variables.
Please stick to the naming scheme "GITLAB_#{name 1_settings.rb in upper case}".
## Omnibus configuration
It's possible to preconfigure the GitLab image by adding the environment variable: `GITLAB_OMNIBUS_CONFIG` to docker run command.
For more information see the ['preconfigure-docker-container' section in the Omnibus documentation](http://doc.gitlab.com/omnibus/docker/#preconfigure-docker-container).
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