Using Shared Libraries in Pipelines

1. Introduction

In Jenkins, shared libraries are a powerful feature that allows teams to define reusable code. This helps in maintaining consistency and reduces duplication across Jenkins pipelines.

2. What are Shared Libraries?

Shared libraries are collections of Groovy scripts and other resources that can be shared across multiple Jenkins pipelines. They help in centralizing code and enforcing coding standards.

3. Setting Up Shared Libraries

1. Go to Jenkins Dashboard.
2. Select Manage Jenkins → Configure System.
3. Scroll down to the Global Pipeline Libraries section.
4. Click on Add and fill in the details:
   • Name: Name of the library.
   • Source Code Management: Choose Git and provide the repository URL.
   • Branch: Specify the branch to use.
5. Save the configuration.

4. Using Shared Libraries in Pipelines

To use a shared library in your pipeline, you need to include it at the beginning of your Jenkinsfile.

@Library('my-shared-library') _

pipeline {
    agent any
    stages {
        stage('Build') {
            steps {
                script {
                    myFunction() // call a function from the shared library
                }
            }
        }
    }
}

In this example, myFunction() is a function defined in the shared library that can be called directly within the pipeline.

5. Best Practices

• Keep your library functions simple and focused.
• Document your library functions thoroughly.
• Version your shared libraries to manage changes effectively.
• Use meaningful names for functions and classes to enhance readability.
• Implement tests for your shared library functions.

6. FAQ