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.
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:
sudo gitlab-rails runner "Integration.where(type: ['GithubService']).delete_all"
bundle exec rails runner "Integration.where(type: ['GithubService']).delete_all" production
If you are running
GitLab =< v13.0 you must also remove
and if you are running
GitLab =< v13.6 you must remove
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.
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.
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 email@example.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.