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diff --git a/doc/downgrade_ee_to_ce/index.md b/doc/downgrade_ee_to_ce/index.md new file mode 100644 index 00000000000..ab95c5f3b09 --- /dev/null +++ b/doc/downgrade_ee_to_ce/index.md @@ -0,0 +1,97 @@ +--- +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 +--- + +# 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 take before installing the CE package +on top of the current EE package, or, if you are in an installation from source, +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, so +you should disable these mechanisms before downgrading and you should provide +alternative authentication methods to your users. + +### Remove Service Integration entries from the database + +The `GithubService` class is only available in the Enterprise Edition codebase, +so if you downgrade to the Community Edition, the following error displays: + +```plaintext +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 Service.inheritance_column to +use another column for that information.) +``` + +All services are created automatically for every project you have, so in order +to avoid getting this error, you need to remove all instances of the +`GithubService` from your database: + +**Omnibus Installation** + +```shell +sudo gitlab-rails runner "Service.where(type: ['GithubService']).delete_all" +``` + +**Source Installation** + +```shell +bundle exec rails runner "Service.where(type: ['GithubService']).delete_all" production +``` + +NOTE: +If you are running `GitLab =< v13.0` you need to also remove `JenkinsDeprecatedService` records +and if you are running `GitLab =< v13.6` you need to also remove `JenkinsService` records. + +### Variables environment scopes + +If you're using this feature and there are variables sharing the same +key, but they have different scopes in a project, then you might want to +revisit the environment scope setting for those variables. + +In CE, environment scopes are completely ignored, therefore 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. + +Data is completely preserved, 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](https://packages.gitlab.com/gitlab/gitlab-ce) +you need, or by adding our CE package repository and following the +[CE installation instructions](https://about.gitlab.com/install/?version=ce). + +**Source Installation** + +To downgrade a source installation, you need to replace the current remote of +your GitLab installation with the Community Edition's remote, fetch the latest +changes, and checkout the latest stable branch: + +```shell +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](../update/index.md) to make +sure all dependencies are up to date. |