251 lines
10 KiB
Markdown
251 lines
10 KiB
Markdown
---
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stage: Ecosystem
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group: Integrations
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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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---
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# Jenkins integration **(FREE)**
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> [Moved](https://gitlab.com/gitlab-org/gitlab/-/issues/246756) to GitLab Free in 13.7.
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You can trigger a build in Jenkins when you push code to your repository or
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create a merge request in GitLab. The Jenkins pipeline status displays on merge
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requests widgets and on the GitLab project's home page.
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<i class="fa fa-youtube-play youtube" aria-hidden="true"></i>
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For an overview of the Jenkins integration for GitLab, see
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[GitLab workflow with Jira issues and Jenkins pipelines](https://youtu.be/Jn-_fyra7xQ).
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Use the Jenkins integration when:
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- You plan to migrate your CI from Jenkins to [GitLab CI/CD](../ci/index.md)
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in the future, but need an interim solution.
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- You're invested in [Jenkins plugins](https://plugins.jenkins.io/) and choose
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to keep using Jenkins to build your apps.
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NOTE:
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This documentation focuses only on how to configure a Jenkins *integration* with
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GitLab. Learn how to set up Jenkins [on your local machine](../development/integrations/jenkins.md)
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in the developer documentation, and how to migrate from Jenkins to GitLab CI/CD in the
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[Migrating from Jenkins](../ci/migration/jenkins.md) documentation.
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The Jenkins integration requires configuration in both GitLab and Jenkins.
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## Grant Jenkins access to the GitLab project
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Grant a GitLab user access to the relevant GitLab projects.
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1. Create a new GitLab user, or choose an existing GitLab user.
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This account is used by Jenkins to access the GitLab projects. We recommend creating a GitLab
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user for only this purpose. If you use a person's account, and their account is deactivated or
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deleted, the Jenkins integration stops working.
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1. Grant the user permission to the GitLab projects.
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If you're integrating Jenkins with many GitLab projects, consider granting the
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user administrator access. Otherwise, add the user to each project
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and grant the Developer role.
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## Grant Jenkins access to the GitLab API
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Create a personal access token to authorize Jenkins to access GitLab.
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1. Sign in to GitLab as the user to be used with Jenkins.
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1. On the top bar, in the top right corner, select your avatar.
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1. Select **Edit profile**.
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1. On the left sidebar, select **Access Tokens**.
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1. Create a [personal access token](../user/profile/personal_access_tokens.md) and
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select the **API** scope.
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1. Copy the personal access token. You need it to [configure the Jenkins server](#configure-the-jenkins-server).
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## Configure the Jenkins server
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Install and configure the Jenkins plugin. The plugin must be installed and configured to
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authorize the connection to GitLab.
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1. On the Jenkins server, select **Manage Jenkins > Manage Plugins**.
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1. Install the [Jenkins GitLab Plugin](https://wiki.jenkins.io/display/JENKINS/GitLab+Plugin).
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1. Select **Manage Jenkins > Configure System**.
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1. In the **GitLab** section, select **Enable authentication for '/project' end-point**.
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1. Select **Add**, then choose **Jenkins Credential Provider**.
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1. Select **GitLab API token** as the token type.
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1. Enter the GitLab personal access token's value in **API Token** and select **Add**.
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1. Enter the GitLab server's URL in **GitLab host URL**.
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1. To test the connection, select **Test Connection**.
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For more information, see
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[Jenkins-to-GitLab authentication](https://github.com/jenkinsci/gitlab-plugin#jenkins-to-gitlab-authentication).
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## Configure the Jenkins project
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Set up the Jenkins project you intend to run your build on.
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1. On your Jenkins instance, go to **New Item**.
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1. Enter the project's name.
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1. Select **Freestyle** or **Pipeline** and select **OK**.
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We recommend a Freestyle project, because the Jenkins plugin updates the build status on
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GitLab. In a Pipeline project, you must configure a script to update the status on GitLab.
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1. Choose your GitLab connection from the dropdown list.
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1. Select **Build when a change is pushed to GitLab**.
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1. Select the following checkboxes:
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- **Accepted Merge Request Events**
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- **Closed Merge Request Events**
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1. Specify how the build status is reported to GitLab:
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- If you created a **Freestyle** project, in the **Post-build Actions** section, choose
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**Publish build status to GitLab**.
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- If you created a **Pipeline** project, you must use a Jenkins Pipeline script to update the status on
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GitLab.
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Example Jenkins Pipeline script:
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```groovy
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pipeline {
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agent any
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stages {
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stage('gitlab') {
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steps {
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echo 'Notify GitLab'
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updateGitlabCommitStatus name: 'build', state: 'pending'
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updateGitlabCommitStatus name: 'build', state: 'success'
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}
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}
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}
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}
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```
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For more Jenkins Pipeline script examples, go to the [Jenkins GitLab plugin repository on GitHub](https://github.com/jenkinsci/gitlab-plugin#scripted-pipeline-jobs).
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## Configure the GitLab project
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Configure the GitLab integration with Jenkins in one of the following ways.
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### Configure a Jenkins integration (recommended)
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GitLab recommends this approach for Jenkins integrations because it is easier to configure
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than the [webhook integration](#configure-a-webhook).
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1. On the top bar, select **Menu > Projects** and find your project.
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1. On the left sidebar, select **Settings > Integrations**.
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1. Select **Jenkins**.
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1. Select the **Active** checkbox.
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1. Select the events you want GitLab to trigger a Jenkins build for:
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- Push
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- Merge request
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- Tag push
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1. Enter the **Jenkins server URL**.
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1. Enter the **Project name**.
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The project name should be URL-friendly, where spaces are replaced with underscores. To ensure
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the project name is valid, copy it from your browser's address bar while viewing the Jenkins
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project.
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1. If your Jenkins server requires
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authentication, enter the **Username** and **Password**.
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1. To test the connection to Jenkins, select **Test settings**.
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1. Select **Save changes**.
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### Configure a webhook
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If you are unable to provide GitLab with your Jenkins server login, you can use this option
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to integrate GitLab and Jenkins.
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1. In the configuration of your Jenkins job, in the GitLab configuration section, select **Advanced**.
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1. Under **Secret Token**, select **Generate**.
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1. Copy the token, and save the job configuration.
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1. In GitLab, create a webhook for your project, enter the trigger URL
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(such as `https://JENKINS_URL/project/YOUR_JOB`) and paste the token in **Secret Token**.
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1. To test the webhook, select **Test**.
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## Related topics
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- For a real use case, read the blog post
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[Continuous integration: From Jenkins to GitLab using Docker](https://about.gitlab.com/blog/2017/07/27/docker-my-precious/).
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- See the ['GitLab vs. Jenkins' comparison page](https://about.gitlab.com/devops-tools/jenkins-vs-gitlab/)
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for information on how moving to a single application for the entire software development
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lifecycle can decrease hours spent on maintaining toolchains by 10% or more.
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## Troubleshooting
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### Error during GitLab configuration - "Connection failed. Please check your settings"
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If you get this error message while configuring GitLab, the following are possible causes:
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- GitLab is unable to reach your Jenkins instance at the address. If your GitLab instance is self-managed, try pinging the
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Jenkins instance at the domain provided on the GitLab instance.
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- The Jenkins instance is at a local address and is not included in the
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[GitLab installation's allowlist](../security/webhooks.md#allowlist-for-local-requests).
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- The credentials for the Jenkins instance do not have sufficient access or are invalid.
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- The **Enable authentication for ‘/project’ end-point** checkbox is not selected in your [Jenkin's plugin configuration](#configure-the-jenkins-server).
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### Error in merge requests - "Could not connect to the CI server"
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You might get the `Could not connect to the CI server` error if GitLab did not
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receive a build status update from Jenkins via the [Commit Status API](../api/commits.md#commit-status).
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This issue occurs when Jenkins is not properly
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configured or there is an error reporting the status via the API.
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To fix this issue, ensure you:
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1. [Configure the Jenkins server](#configure-the-jenkins-server) for GitLab API access.
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1. [Configure the Jenkins project](#configure-the-jenkins-project), including the
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'Publish build status to GitLab' post-build action.
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### Merge request event does not trigger a Jenkins pipeline
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This issue can occur when the request exceeds the
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[webhook timeout](../user/project/integrations/webhooks.md#webhook-fails-or-multiple-webhook-requests-are-triggered),
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which is set to 10 seconds by default.
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Check the [service hook logs](../user/project/integrations/overview.md#troubleshooting-integrations)
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for request failures or check the `/var/log/gitlab/gitlab-rails/production.log`
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file for messages like:
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```plaintext
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WebHook Error => Net::ReadTimeout
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```
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or
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```plaintext
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WebHook Error => execution expired
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```
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Or check for duplicate messages in `/var/log/gitlab/gitlab-rail`, like:
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```plaintext
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2019-10-25_04:22:41.25630 2019-10-25T04:22:41.256Z 1584 TID-ovowh4tek WebHookWorker JID-941fb7f40b69dff3d833c99b INFO: start
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2019-10-25_04:22:41.25630 2019-10-25T04:22:41.256Z 1584 TID-ovowh4tek WebHookWorker JID-941fb7f40b69dff3d833c99b INFO: start
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```
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To fix this issue:
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1. Increase the `gitlab_rails['webhook_timeout']` value in the `gitlab.rb`
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configuration file.
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1. [Restart](../administration/restart_gitlab.md) GitLab:
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```shell
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gitlab-ctl reconfigure
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```
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### Enable job logs in Jenkins
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To troubleshoot an integration issue, you can enable job logs in Jenkins to get
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more details about your builds.
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To enable job logs in Jenkins:
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1. Go to **Dashboard > Manage Jenkins > System Log**.
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1. Select **Add new log recorder**.
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1. Enter a name for the log recorder.
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1. On the next screen, select **Add** and enter `org.jenkinsci.plugins.workflow.job`.
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1. Make sure that the Log Level is **All** and select **Save**.
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To view your logs:
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1. Run a build.
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1. Go to **Dashboard > Manage Jenkins > System Log**.
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1. Select your logger and check the logs.
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