• Use configuration files to prevent new users from creating top-level groups
  • Prevent existing users from creating top-level groups
• Prevent users from changing their usernames
• Prevent Guest users from promoting to a higher role

Modify global user settings

GitLab administrators can modify user settings for the entire GitLab instance.

Use configuration files to prevent new users from creating top-level groups

By default, new users can create top-level groups. To disable new users’ ability to create top-level groups (does not affect existing users’ setting), GitLab administrators can modify this setting:

• In GitLab 15.5 and later, using either:
  • The GitLab UI.
  • The application setting API.
• In GitLab 15.4 and earlier, in a configuration file by following the steps in this section.

To disable new users’ ability to create top-level groups using the configuration file.

For Linux package installations:

1. Edit /etc/gitlab/gitlab.rb and add the following line:

   gitlab_rails['gitlab_default_can_create_group'] = false
   

2. Reconfigure and restart GitLab.

For self-compiled installations:

1. Edit config/gitlab.yml and uncomment the following line:

   # default_can_create_group: false  # default: true
   

2. Restart GitLab.

Prevent existing users from creating top-level groups

Administrators can:

• Use the Admin area to prevent an existing user from creating top-level groups.
• Use the modify an existing user API endpoint to change the can_create_group setting.

Prevent users from changing their usernames

By default, new users can change their usernames. To disable your users’ ability to change their usernames.

For Linux package installations:

1. Edit /etc/gitlab/gitlab.rb and add the following line:

   gitlab_rails['gitlab_username_changing_enabled'] = false
   

2. Reconfigure and restart GitLab.

For self-compiled installations:

1. Edit config/gitlab.yml and uncomment the following line:

   # username_changing_enabled: false # default: true - User can change their username/namespace
   

2. Restart GitLab.

Prevent Guest users from promoting to a higher role

On GitLab Ultimate, Guest users do not count toward paid seats. However, when a Guest user creates projects and namespaces, they are automatically promoted to a higher role than Guest and occupy a paid seat.

To prevent Guest users from being promoted to a higher role and occupying a paid seat, set the user as external.

External users cannot create personal projects or namespaces. If a user with the Guest role is promoted into a higher role by another user, the external user setting must be removed before they can create personal projects or namespaces. For a complete list of restrictions for external users, see External users.