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---
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stage: Create
group: Ecosystem
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
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comments: false
---
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# GitLab integrations **(FREE)**
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GitLab can be integrated with external services for enhanced functionality.
## Issue trackers
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You can use an [external issue tracker ](external-issue-tracker.md ) at the same time as the GitLab
issue tracker, or use only the external issue tracker.
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## Authentication sources
GitLab can be configured to authenticate access requests with the following authentication sources:
- Enable the [Auth0 OmniAuth ](auth0.md ) provider.
- Enable sign in with [Bitbucket ](bitbucket.md ) accounts.
- Configure GitLab to sign in using [CAS ](cas.md ).
- Integrate with [Kerberos ](kerberos.md ).
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- Enable sign in via [LDAP ](../administration/auth/ldap/index.md ).
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- Enable [OAuth2 provider ](oauth_provider.md ) application creation.
- Use [OmniAuth ](omniauth.md ) to enable sign in via Twitter, GitHub, GitLab.com, Google,
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Bitbucket, Facebook, Shibboleth, SAML, Crowd, Azure, or Authentiq ID.
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- Use GitLab as an [OpenID Connect ](openid_connect_provider.md ) identity provider.
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- Authenticate to [Vault ](vault.md ) through GitLab OpenID Connect.
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- Configure GitLab as a [SAML ](saml.md ) 2.0 Service Provider.
## Security enhancements
GitLab can be integrated with the following external services to enhance security:
- [Akismet ](akismet.md ) helps reduce spam.
- Google [reCAPTCHA ](recaptcha.md ) helps verify new users.
GitLab also provides features to improve the security of your own application. For more details see [GitLab Secure ](../user/application_security/index.md ).
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## Security partners
GitLab has integrated with several security partners. For more information, see
[Security partners integration ](security_partners/index.md ).
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## Continuous integration
GitLab can be integrated with the following external service for continuous integration:
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- [Jenkins ](jenkins.md ) CI.
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## Feature enhancements
GitLab can be integrated with the following enhancements:
- Add GitLab actions to [Gmail actions buttons ](gmail_action_buttons_for_gitlab.md ).
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- Configure [PlantUML ](../administration/integration/plantuml.md )
or [Kroki ](../administration/integration/kroki.md ) to use diagrams in AsciiDoc and Markdown documents.
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- Attach merge requests to [Trello ](trello_power_up.md ) cards.
- Enable integrated code intelligence powered by [Sourcegraph ](sourcegraph.md ).
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- Add [Elasticsearch ](elasticsearch.md ) for [Advanced Search ](../user/search/advanced_search.md ).
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## Integrations
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Integration with services such as Campfire, Flowdock, HipChat, Pivotal Tracker, and Slack are available as [Integrations ](../user/project/integrations/overview.md ).
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## Troubleshooting
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### SSL certificate errors
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When trying to integrate GitLab with services using self-signed certificates,
SSL certificate errors can occur in different parts of the application. Sidekiq
is a common culprit.
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There are two approaches you can take to solve this:
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1. Add the root certificate to the trusted chain of the OS.
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1. If using Omnibus, you can add the certificate to the GitLab trusted certificates.
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**OS main trusted chain**
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This [resource ](https://manuals.gfi.com/en/kerio/connect/content/server-configuration/ssl-certificates/adding-trusted-root-certificates-to-the-server-1605.html )
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has all the information you need to add a certificate to the main trusted chain.
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This [answer ](https://superuser.com/questions/437330/how-do-you-add-a-certificate-authority-ca-to-ubuntu )
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at Super User also has relevant information.
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**Omnibus Trusted Chain**
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[Install the self signed certificate or custom certificate authorities ](https://docs.gitlab.com/omnibus/common_installation_problems/README.html#using-self-signed-certificate-or-custom-certificate-authorities )
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in to Omnibus GitLab.
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It is enough to concatenate the certificate to the main trusted certificate
however it may be overwritten during upgrades:
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```shell
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cat jira.pem >> /opt/gitlab/embedded/ssl/certs/cacert.pem
```
After that restart GitLab with:
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```shell
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sudo gitlab-ctl restart
```
