# jenkinsci/gitlab-plugin for Jenkins and GitLab integration

> The jenkinsci/gitlab-plugin connects GitLab events to Jenkins jobs and reports build results back to GitLab. It suits teams using separate GitLab and Jenkins installations that need authenticated webhooks, merge request triggers, and GitLab build notifications.

**jenkinsci/gitlab-plugin** — A Jenkins plugin for interfacing with GitLab

- Repository: https://github.com/jenkinsci/gitlab-plugin
- Website: https://plugins.jenkins.io/gitlab-plugin/
- Stars: 1,446 · Forks: 620
- Language: Java
- License: GPL-2.0
- Published: 2026-10-16 · Updated: 2026-10-16 · Language: en
- Canonical page: https://hysenlabs.com/projects/jenkinsci-gitlab-plugin

## GitLab webhook delivery to Jenkins jobs

jenkinsci/gitlab-plugin solves the connection problem between two separate CI systems. GitLab can send a webhook when code is committed or when a merge request is opened or updated, and the plugin can convert that event into a Jenkins build trigger. The plugin can also send the resulting build status back to GitLab. This makes it relevant to Jenkins administrators and developers whose source repositories live in GitLab but whose build automation runs in Jenkins.

The supported flow has two directions. GitLab-to-Jenkins authentication protects the inbound callback that starts a job. Jenkins-to-GitLab authentication allows the plugin to update status information through a configured GitLab connection. That distinction matters because configuring only the webhook does not, by itself, document every permission needed for outbound notifications.

The README does not describe a standalone CLI, local daemon, or separate service that engineers install beside Jenkins. It presents this as a Jenkins plugin, with configuration reached through Jenkins pages such as Manage Jenkins and individual job configuration screens. Its intended deployment context is therefore a running Jenkins controller with access to GitLab projects.

## Authentication choices for GitLab callbacks

Inbound authentication is mandatory in the documented setup because an unauthenticated endpoint could let unauthorized users trigger Jenkins jobs. The README describes a global method that embeds a Jenkins user ID and API token in the webhook URL. It also describes a per-project method in which Jenkins generates a Secret Token and the token is entered in GitLab's webhook configuration.

The global URL format documented by the project is:

```text
https://USERID:APITOKEN@JENKINS_URL/project/YOUR_JOB
```

This approach centralizes one Jenkins identity across callbacks, and the README says that identity needs at minimum Job/Build permissions. The instructions also require logging in as that user before creating an API token. GitLab's Secret Token field is left empty for this global form.

The per-project workflow is narrower. An administrator opens the job's GitLab configuration, selects Advanced, generates a Secret Token, saves the job, and then enters that token into GitLab. The documented project webhook URL has this form:

```text
https://JENKINS_URL/project/YOUR_JOB
```

Both forms rely on HTTPS according to the security guidance. The plugin documentation warns that API tokens and other secrets must not be sent over unsecure connections. The README also lists a way to disable authentication, but labels it not recommended. That option does not remove the operational security implications of exposing a build-trigger endpoint.

## Job-type configuration and payload variables

The repository documents configuration paths for Freestyle, Pipeline, Pipeline Multibranch, Matrix, and Job DSL workflows rather than presenting one universal trigger. Pipeline documentation is divided between scripted and declarative forms, while Pipeline Multibranch jobs receive separate trigger guidance. This indicates that adopting the plugin requires matching its configuration surface to the Jenkins job model in use.

When GitLab triggers a build, the plugin exports variables derived from the JSON payload. These include repository identity, branch names, commit identifiers, user information, merge request metadata, labels, target branch data, and the trigger phrase. A Pipeline can therefore use values such as these:

```text
gitlabBranch
gitlabSourceBranch
gitlabActionType
gitlabUserName
gitlabUserUsername
gitlabMergeRequestTitle
gitlabMergeRequestId
gitlabMergeRequestIid
gitlabTargetBranch
gitlabBefore
gitlabAfter
gitlabTriggerPhrase
```

The README lists additional variables for source and target repository URLs and namespaces, merge request state and assignees, the last commit, and SSH or HTTP clone URLs. Availability follows the event data rather than being a promise that every webhook populates every field.

A hard boundary appears in Pipeline Multibranch jobs: the README explicitly says that these defined variables are not available there. Jobs that rely on `gitlabBranch`, merge request identifiers, or other payload-derived values should not be assumed to behave like ordinary Freestyle or Pipeline jobs.

For troubleshooting, Jenkins exposes log recorder configuration in Manage Jenkins. The documented logger name is `com.dabsquared.gitlabjenkins`, and the logger level can be set to `FINEST`. This produces plugin-specific diagnostic output when GitLab actions are triggered.

## Merge request actions and webhook behavior

The plugin includes controls for actions that are useful in merge request workflows. The README lists branch filtering, builds when tags are pushed, adding a note to a merge request, accepting a merge request after a successful build, and canceling pending or running builds when a merge request changes. It also documents checking whether a label is applied and notifying a specific GitLab project through a specific GitLab connection.

These features show that the integration is not limited to turning commits into builds. A Pipeline can react to an update, decide whether a label is present, and report or annotate the merge request. However, the README excerpt does not provide a complete Pipeline syntax example for each advanced action. An adopter cannot verify exact syntax from the documentation shown here and would need to inspect the plugin's job configuration UI or source before encoding every action in Jenkinsfile files.

Branch filtering can reduce unnecessary job starts, while tag-trigger configuration addresses repositories that use tags as delivery points. Canceling pending or running builds addresses a separate failure mode: an outdated merge request update can leave Jenkins occupied with work that has already been superseded. These are operational controls rather than performance claims, and their effect depends on correct webhook delivery and Jenkins job configuration.

## Installation path and first webhook use

The README points users to the Jenkins plugin page and includes a repository link labeled Testing With Docker, but it does not give a complete installation command or a Jenkins plugin installation procedure. The documented first-use procedure therefore begins in an existing Jenkins and GitLab installation rather than with a package manager command.

First, create or select a Jenkins user with at least Job/Build permissions. If using global authentication, log in as that user, open its Configure page, add an API token, and record the user ID and token. If using per-job authentication, open the target job's GitLab configuration, select Advanced, generate its Secret Token, and save the job.

Next, create the GitLab project webhook. Enter the appropriate documented URL, add a Secret Token only for the per-job method, and use GitLab's Test button. The expected result is a successful webhook test. That proves callback delivery and endpoint authentication, but it does not establish that outbound build status reporting works. The separate Jenkins-to-GitLab authentication configuration must be checked for jobs that need GitLab notifications.

After delivery succeeds, trigger an action from GitLab, such as a commit or merge request event, and inspect the intended Jenkins job. For missing events, the README directs administrators to configure a log recorder using `com.dabsquared.gitlabjenkins` at level `FINEST`.

## Compatibility, support, and upgrade boundaries

The plugin is under the GPL-2.0 license. That identifies the repository's stated licensing model, but this article does not interpret license obligations or provide legal advice. The project is volunteer-developed and is not formally supported by GitLab Inc. or CloudBees Inc. Organizations that require a vendor-backed support agreement cannot treat the project documentation as such an agreement.

The stated compatibility policy is narrower than simply saying that any recent GitLab release works. The README says the plugin cannot support GitLab versions older than N-2, where N is the current major GitLab release. Because GitLab changes frequently, compatibility must be checked against the installed GitLab version rather than inferred from the Java language or the plugin's release number.

The repository is not archived, and its last push was on 2026-10-15. Releases were also published on 2026-10-15, 2026-10-07, and 2026-09-22. This is evidence of recent repository and release activity, but not a guarantee that every GitLab deployment or Jenkins configuration is supported. Upgrading remains operationally relevant because changing the plugin, Jenkins core, GitLab version, authentication settings, or webhook URL can alter configuration behavior.

A custom webhook receiver or a separately maintained Jenkins integration script is the clearest alternative approach. Such a system can also accept GitLab events and trigger Jenkins, but it would require its own endpoint validation, payload parsing, merge request handling, and status-update logic. The plugin's advantage is that those integration concerns are already represented in its Jenkins configuration and documented variables. The trade-off is dependency on the plugin's compatibility window and its current feature set.

## Conclusion

Adopt the plugin when your GitLab repositories must trigger Jenkins jobs through authenticated webhooks and you need build results reported back to GitLab. Do not choose it if you require GitLab versions older than N-2, need formal support from GitLab Inc. or CloudBees Inc., or cannot expose the documented HTTPS callback path. Before adoption, verify webhook authentication in your Jenkins security model, test each configured job type, and confirm that the GitLab version falls within the stated support window.

## FAQ

### What does jenkinsci/gitlab-plugin do?

It lets GitLab trigger Jenkins builds for commits and merge request changes, then reports build status back to GitLab.

### How do I authenticate GitLab webhook requests in jenkinsci/gitlab-plugin?

The README documents either Jenkins user credentials in the webhook URL or a generated Secret Token in the job configuration. It warns that API tokens and other secrets must be sent only over HTTPS.

### Are GitLab payload variables available in Pipeline Multibranch jobs?

No. The README explicitly states that its defined GitLab environment variables are not available in Pipeline Multibranch jobs.

## Sources

- [jenkinsci/gitlab-plugin on GitHub](https://github.com/jenkinsci/gitlab-plugin)
- [License: GPL-2.0](https://github.com/jenkinsci/gitlab-plugin/blob/master/LICENSE)
- [Project website](https://plugins.jenkins.io/gitlab-plugin/)
- [README](https://github.com/jenkinsci/gitlab-plugin/blob/master/README.md)
- [Releases](https://github.com/jenkinsci/gitlab-plugin/releases)

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Hysen Labs editorial analysis, written from the project's own repository and release notes. Cite the canonical page: https://hysenlabs.com/projects/jenkinsci-gitlab-plugin