-[Enable OmniAuth for an Existing User](#enable-omniauth-for-an-existing-user)
-[Enable OmniAuth for an Existing User](#enable-omniauth-for-an-existing-user)
-[OmniAuth configuration sample when using Omnibus GitLab](https://gitlab.com/gitlab-org/omnibus-gitlab/tree/master#omniauth-google-twitter-github-login)