166 lines
8.1 KiB
Markdown
166 lines
8.1 KiB
Markdown
# Jenkins CI service **(STARTER)**
|
|
|
|
>**Note:**
|
|
In GitLab 8.3, Jenkins integration using the
|
|
[GitLab Hook Plugin](https://wiki.jenkins.io/display/JENKINS/GitLab+Hook+Plugin)
|
|
was deprecated in favor of the
|
|
[GitLab Plugin](https://wiki.jenkins.io/display/JENKINS/GitLab+Plugin).
|
|
The deprecated integration has been renamed to [Jenkins CI (Deprecated)](jenkins_deprecated.md) in the
|
|
integration settings. We may remove this in a future release and recommend
|
|
using the new 'Jenkins CI' integration instead which is described in this
|
|
document.
|
|
|
|
## Overview
|
|
|
|
[Jenkins](https://jenkins.io/) is a great Continuous Integration tool, similar to our built-in
|
|
[GitLab CI/CD](../ci/README.md).
|
|
|
|
GitLab's Jenkins integration allows you to trigger a Jenkins build when you
|
|
push code to a repository, or when a merge request is created. Additionally,
|
|
it shows the pipeline status on merge requests widgets and on the project's home page.
|
|
|
|
Videos are also available on [GitLab workflow with Jira issues and Jenkins pipelines](https://youtu.be/Jn-_fyra7xQ)
|
|
and [Migrating from Jenkins to GitLab](https://www.youtube.com/watch?v=RlEVGOpYF5Y).
|
|
|
|
## Use cases
|
|
|
|
- Suppose you are new to GitLab, and want to keep using Jenkins until you prepare
|
|
your projects to build with [GitLab CI/CD](../ci/README.md). You set up the
|
|
integration between GitLab and Jenkins, then you migrate to GitLab CI/CD later. While
|
|
you organize yourself and your team to onboard GitLab, you keep your pipelines
|
|
running with Jenkins, but view the results in your project's repository in GitLab.
|
|
- Your team uses [Jenkins Plugins](https://plugins.jenkins.io/) for other proceedings,
|
|
therefore, you opt for keep using Jenkins to build your apps. Show the results of your
|
|
pipelines directly in GitLab.
|
|
|
|
For a real use case, read the blog post [Continuous integration: From Jenkins to GitLab using Docker](https://about.gitlab.com/blog/2017/07/27/docker-my-precious/).
|
|
|
|
NOTE: **Moving from a traditional CI plug-in to a single application for the entire software development lifecycle can decrease hours spent on maintaining toolchains by 10% or more.**
|
|
Visit the ['GitLab vs. Jenkins' comparison page](https://about.gitlab.com/devops-tools/jenkins-vs-gitlab.html) to learn how our built-in CI compares to Jenkins.
|
|
|
|
## Requirements
|
|
|
|
- [Jenkins GitLab Plugin](https://wiki.jenkins.io/display/JENKINS/GitLab+Plugin)
|
|
- [Jenkins Git Plugin](https://wiki.jenkins.io/display/JENKINS/Git+Plugin)
|
|
- Git clone access for Jenkins from the GitLab repository
|
|
- GitLab API access to report build status
|
|
|
|
## Configure GitLab users
|
|
|
|
Create a user or choose an existing user that Jenkins will use to interact
|
|
through the GitLab API. This user will need to be a global Admin or added
|
|
as a member to each Group/Project. Developer permission is required for reporting
|
|
build status. This is because a successful build status can trigger a merge
|
|
when 'Merge when pipeline succeeds' feature is used. Some features of the GitLab
|
|
Plugin may require additional privileges. For example, there is an option to
|
|
accept a merge request if the build is successful. Using this feature would
|
|
require developer, maintainer or owner-level permission.
|
|
|
|
Copy the private API token from **Profile Settings -> Account**. You will need this
|
|
when configuring the Jenkins server later.
|
|
|
|
## Configure the Jenkins server
|
|
|
|
Install [Jenkins GitLab Plugin](https://wiki.jenkins.io/display/JENKINS/GitLab+Plugin)
|
|
and [Jenkins Git Plugin](https://wiki.jenkins.io/display/JENKINS/Git+Plugin).
|
|
|
|
Go to Manage Jenkins -> Configure System and scroll down to the 'GitLab' section.
|
|
Enter the GitLab server URL in the 'GitLab host URL' field and paste the API token
|
|
copied earlier in the 'API Token' field.
|
|
|
|
For more information, see GitLab Plugin documentation about
|
|
[Jenkins-to-GitLab authentication](https://github.com/jenkinsci/gitlab-plugin#jenkins-to-gitlab-authentication)
|
|
|
|
|
|
|
|
## Configure a Jenkins project
|
|
|
|
Follow the GitLab Plugin documentation about [Jenkins Job Configuration](https://github.com/jenkinsci/gitlab-plugin#jenkins-job-configuration).
|
|
|
|
NOTE: **Note:**
|
|
Be sure to include the steps about [Build status configuration](https://github.com/jenkinsci/gitlab-plugin#build-status-configuration).
|
|
The 'Publish build status to GitLab' post-build step is required to view
|
|
Jenkins build status in GitLab Merge Requests.
|
|
|
|
## Configure a GitLab project
|
|
|
|
Create a new GitLab project or choose an existing one. Then, go to **Integrations ->
|
|
Jenkins CI**.
|
|
|
|
Check the 'Active' box. Select whether you want GitLab to trigger a build
|
|
on push, Merge Request creation, tag push, or any combination of these. We
|
|
recommend unchecking 'Merge Request events' unless you have a specific use-case
|
|
that requires re-building a commit when a merge request is created. With 'Push
|
|
events' selected, GitLab will build the latest commit on each push and the build
|
|
status will be displayed in the merge request.
|
|
|
|
Enter the Jenkins URL and Project name. The project name should be URL-friendly
|
|
where spaces are replaced with underscores. To be safe, copy the project name
|
|
from the URL bar of your browser while viewing the Jenkins project.
|
|
|
|
Optionally, enter a username and password if your Jenkins server requires
|
|
authentication.
|
|
|
|
|
|
|
|
## Plugin functional overview
|
|
|
|
GitLab does not contain a database table listing commits. Commits are always
|
|
read from the repository directly. Therefore, it is not possible to retain the
|
|
build status of a commit in GitLab. This is overcome by requesting build
|
|
information from the integrated CI tool. The CI tool is responsible for creating
|
|
and storing build status for Commits and Merge Requests.
|
|
|
|
### Steps required to implement a similar integration
|
|
|
|
>**Note:**
|
|
All steps are implemented using AJAX requests on the merge request page.
|
|
|
|
1. In order to display the build status in a merge request you must create a project service in GitLab.
|
|
1. Your project service will do a (JSON) query to a URL of the CI tool with the SHA1 of the commit.
|
|
1. The project service builds this URL and payload based on project service settings and knowledge of the CI tool.
|
|
1. The response is parsed to give a response in GitLab (success/failed/pending).
|
|
|
|
## Troubleshooting
|
|
|
|
### Error in merge requests - "Could not connect to the CI server"
|
|
|
|
This integration relies on Jenkins reporting the build status back to GitLab via
|
|
the [Commit Status API](../api/commits.md#commit-status).
|
|
|
|
The error 'Could not connect to the CI server' usually means that GitLab did not
|
|
receive a build status update via the API. Either Jenkins was not properly
|
|
configured or there was an error reporting the status via the API.
|
|
|
|
1. [Configure the Jenkins server](#configure-the-jenkins-server) for GitLab API access
|
|
1. [Configure a Jenkins project](#configure-a-jenkins-project), including the
|
|
'Publish build status to GitLab' post-build action.
|
|
|
|
### Merge Request event does not trigger a Jenkins Pipeline
|
|
|
|
Check [service hook logs](../user/project/integrations/overview.md#troubleshooting-integrations) for request failures or check the `/var/log/gitlab/gitlab-rails/production.log` file for messages like:
|
|
|
|
```plaintext
|
|
WebHook Error => Net::ReadTimeout
|
|
```
|
|
|
|
or
|
|
|
|
```plaintext
|
|
WebHook Error => execution expired
|
|
```
|
|
|
|
If those are present, the request is exceeding the
|
|
[webhook timeout](../user/project/integrations/webhooks.md#receiving-duplicate-or-multiple-webhook-requests-triggered-by-one-event),
|
|
which is set to 10 seconds by default.
|
|
|
|
To fix this the `gitlab_rails['webhook_timeout']` value will need to be increased
|
|
in the `gitlab.rb` config file, followed by the [`gitlab-ctl reconfigure` command](../administration/restart_gitlab.md).
|
|
|
|
If you don't find the errors above, but do find *duplicate* entries like below (in `/var/log/gitlab/gitlab-rail`), this
|
|
could also indicate that [webhook requests are timing out](../user/project/integrations/webhooks.md#receiving-duplicate-or-multiple-webhook-requests-triggered-by-one-event):
|
|
|
|
```plaintext
|
|
2019-10-25_04:22:41.25630 2019-10-25T04:22:41.256Z 1584 TID-ovowh4tek WebHookWorker JID-941fb7f40b69dff3d833c99b INFO: start
|
|
2019-10-25_04:22:41.25630 2019-10-25T04:22:41.256Z 1584 TID-ovowh4tek WebHookWorker JID-941fb7f40b69dff3d833c99b INFO: start
|
|
```
|