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Use Jenkins Shared Libraries in a Pipeline

For Jenkins pipelines that contain the same stages or steps, one way to avoid repetition in the pipeline codes is to use Jenkins shared libraries in the Jenkinsfiles.

This tutorial demonstrates how to use Jenkins shared libraries in KubeSphere DevOps pipelines.

Prerequisites

You need to enable the KubeSphere DevOps system.
You need to create a workspace, a DevOps project and a user (project-regular). This user must be invited to the DevOps project with the operator role. For more information, refer to Create Workspaces, Projects, Users and Roles.
You need to have a Jenkins shared library available. This tutorial uses the Jenkins shared library in a GitHub repository as an example.

Configure a Shared Library on the Jenkins Dashboard

Log in to the Jenkins dashboard and click Manage Jenkins in the left navigation pane.
Scroll down and click Configure System.
Scroll down to Global Pipeline Libraries and click Add.
Configure the fields as below.
- Name. Set a name (for example, demo-shared-library) for the shared library so that you can import the shared library by referring to this name in a Jenkinsfile.
- Default version. Set a branch name from the repository where you put your shared library as the default branch for importing your shared library. Enter master for this tutorial.
- Under Retrieval method, select Modern SCM.
- Under Source Code Management, select Git and enter the URL of the example repository for Project Repository. You have to configure Credentials if you use your own repository that requires the credentials for accessing it.
When you finish editing, click Apply.

Note

You can also configure Folder-level Shared Libraries.

Use the Shared Library in a Pipeline

Step 1: Create a pipeline

Log in to the KubeSphere web console as project-regular. Go to your DevOps project and click Create on the Pipelines page.
Set a name (for example, demo-shared-library) in the displayed dialog box and click Next.
On the Advanced Settings tab, click Create to create a pipeline with the default settings.

Step 2: Edit the pipeline

In the pipeline list, click the pipeline to go to its details page and click Edit Jenkinsfile.

In the displayed dialog box, enter the following example Jenkinsfile. When you finish editing, click OK.

library identifier: 'devops-ws-demo@master', retriever: modernSCM([
    $class: 'GitSCMSource',
    remote: 'https://github.com/devops-ws/jenkins-shared-library',
    traits: [[$class: 'jenkins.plugins.git.traits.BranchDiscoveryTrait']]
])

pipeline {
    agent any

    stages {
        stage('Demo') {
            steps {
                script {
                    mvn.fake()
                }
            }
        }
    }
}

Note

You can specify a label for agent based on your needs.

Alternatively, you can use a Jenkinsfile starting with @Library('<the configured name of shared library>') _. If you use this type of Jenkinsfile, you need to configure the shared library on the Jenkins dashboard in advance. In this tutorial, you can use the following example Jenkinsfile.
```
@Library('demo-shared-library') _

pipeline {
    agent any

    stages {
        stage('Demo') {
            steps {
                script {
                    mvn.fake()
                }
            }
        }
    }
}
```
Note

You can use @Library('demo-shared-library@<branch name>') _ to specify a specific branch.

Step 3: Run the pipeline

You can view the stage under the Task Status tab. Click Run to run it.
After a while, the pipeline ran successfully.
You can click the Successful record under Run Records, and then click View Logs to view the log details.

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Thanks for the feedback. If you have a specific question about how to use KubeSphere, ask it on Slack. Open an issue in the GitHub repo if you want to report a problem or suggest an improvement.

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