Downgrading from EE to CE

If you ever decide to downgrade your Enterprise Edition back to the Community Edition, there are a few steps you need to take beforehand. On Omnibus GitLab installations, these steps are made before installing the CE package on top of the current EE package. On installations from source, they are done before you change remotes and fetch the latest CE code.

Disable Enterprise-only features

First thing to do is to disable the following features.

Authentication mechanisms

Kerberos and Atlassian Crowd are only available on the Enterprise Edition. You should disable these mechanisms before downgrading. Be sure to provide alternative authentication methods to your users.

Remove Service Integration entries from the database

The GitHub integration is only available in the Enterprise Edition codebase, so if you downgrade to the Community Edition, the following error displays:

Completed 500 Internal Server Error in 497ms (ActiveRecord: 32.2ms)

ActionView::Template::Error (The single-table inheritance mechanism failed to locate the subclass: 'GithubService'. This
error is raised because the column 'type' is reserved for storing the class in case of inheritance. Please rename this
column if you didn't intend it to be used for storing the inheritance class or overwrite Integration.inheritance_column to
use another column for that information.)

All integrations are created automatically for every project you have. To avoid getting this error, you must remove all records with the type set to GithubService from your database:

• Omnibus Installation

  sudo gitlab-rails runner "Integration.where(type: ['GithubService']).delete_all"

• Source Installation

  bundle exec rails runner "Integration.where(type: ['GithubService']).delete_all" production

NOTE: If you are running GitLab =< v13.0 you must also remove JenkinsDeprecatedService records and if you are running GitLab =< v13.6 you must remove JenkinsService records.

Variables environment scopes

In GitLab Community Edition, environment scopes are completely ignored, so if you are using this feature there may be some necessary adjustments to your configuration. This is especially true if configuration variables share the same key, but have different scopes in a project. In cases like these you could accidentally get a variable which you're not expecting for a particular environment. Make sure that you have the right variables in this case.

Your data is completely preserved in the transition, so you could always upgrade back to EE and restore the behavior if you leave it alone.

Downgrade to CE

After performing the above mentioned steps, you are now ready to downgrade your GitLab installation to the Community Edition.

• Omnibus Installation

  To downgrade an Omnibus installation, it is sufficient to install the Community Edition package on top of the currently installed one. You can do this manually, by directly downloading the package you need, or by adding our CE package repository and following the CE installation instructions.

• Source Installation

  To downgrade a source installation, you must replace the current remote of your GitLab installation with the Community Edition's remote. After that, you can fetch the latest changes, and checkout the latest stable branch:

  git remote set-url origin git@gitlab.com:gitlab-org/gitlab-foss.git
  git fetch --all
  git checkout 8-x-stable

Remember to follow the correct update guides to make sure all dependencies are up to date.