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+# GitLab Integration
+
+GitLab integrates with multiple third-party services to allow external issue
+trackers and external authentication.
+
+See the documentation below for details on how to configure these services.
+
+- [Jira](../project_services/jira.md) Integrate with the JIRA issue tracker
+- [External issue tracker](external-issue-tracker.md) Redmine, JIRA, etc.
+- [LDAP](ldap.md) Set up sign in via LDAP
+- [OmniAuth](omniauth.md) Sign in via Twitter, GitHub, GitLab.com, Google, Bitbucket, Facebook, Shibboleth, SAML, Crowd and Azure
+- [SAML](saml.md) Configure GitLab as a SAML 2.0 Service Provider
+- [CAS](cas.md) Configure GitLab to sign in using CAS
+- [Slack](slack.md) Integrate with the Slack chat service
+- [OAuth2 provider](oauth_provider.md) OAuth2 application creation
+- [Gmail actions buttons](gmail_action_buttons_for_gitlab.md) Adds GitLab actions to messages
+- [reCAPTCHA](recaptcha.md) Configure GitLab to use Google reCAPTCHA for new users
+- [Akismet](akismet.md) Configure Akismet to stop spam
+
+GitLab Enterprise Edition contains [advanced Jenkins support][jenkins].
+
+[jenkins]: http://docs.gitlab.com/ee/integration/jenkins.html
+
+
+## Project services
+
+Integration with services such as Campfire, Flowdock, Gemnasium, HipChat,
+Pivotal Tracker, and Slack are available in the form of a [Project Service][].
+
+[Project Service]: ../project_services/project_services.md
+
+## SSL certificate errors
+
+When trying to integrate GitLab with services that are using self-signed certificates,
+it is very likely that SSL certificate errors will occur on different parts of the
+application, most likely Sidekiq. There are 2 approaches you can take to solve this:
+
+1. Add the root certificate to the trusted chain of the OS.
+1. If using Omnibus, you can add the certificate to GitLab's trusted certificates.
+
+**OS main trusted chain**
+
+This [resource](http://kb.kerio.com/product/kerio-connect/server-configuration/ssl-certificates/adding-trusted-root-certificates-to-the-server-1605.html)
+has all the information you need to add a certificate to the main trusted chain.
+
+This [answer](http://superuser.com/questions/437330/how-do-you-add-a-certificate-authority-ca-to-ubuntu)
+at SuperUser also has relevant information.
+
+**Omnibus Trusted Chain**
+
+It is enough to concatenate the certificate to the main trusted certificate:
+
+```bash
+cat jira.pem >> /opt/gitlab/embedded/ssl/certs/cacert.pem
+```
+
+After that restart GitLab with:
+
+```bash
+sudo gitlab-ctl restart
+```