# Authenticate Using OAuth - GitLab

1. Sign in to your GitLab

2. Navigate to the application management page at `https://your.gitlab.domain/admin/applications` (admin permissions required)

3. Click **New application** to create a new application and fill out the registration form:

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4. Click **Submit**

5. In the list of applications select **CodiMD**. Leave that site open to copy the application ID and secret in the next step.


6. In the `docker-compose.yml` add the following environment variables to `app:` `environment:`

- CMD_DOMAIN=your.codimd.domain
- CMD_URL_ADDPORT=443
- CMD_PROTOCOL_USESSL=true
- CMD_GITLAB_BASEURL=https://your.gitlab.domain
- CMD_GITLAB_CLIENTID=23462a34example99XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
- CMD_GITLAB_CLIENTSECRET=5532e9dexamplXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

7. Run `docker-compose up -d` to apply your settings.

8. Sign in to your CodiMD using your GitLab ID:


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###### tags: `CodiMD` `Docs`