Day 26 : Jenkins Declarative Pipeline.

Topics covered in this blog:

• What is Pipeline?

• Types of Jenkins Pipeline.

• How to Use Jenkins Pipeline with Example Task.

• One of the most important parts of your DevOps and CI/CD journey is a Declarative Pipeline Syntax of Jenkins

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What is Pipeline?

• In Jenkins, a pipeline refers to a way of defining a sequence of stages that describe the steps of a software delivery process. This can include building, testing, and deploying code.

• A pipeline can be defined in a Jenkinsfile, which is a text file that contains the stages and steps of the pipeline. The Jenkinsfile can be stored in a version control system like Git along with the code it describes, allowing for the pipeline to be versioned alongside the code.

Types of Jenkins Pipeline :

• Declarative: Declarative is a more recent and advanced implementation of a pipeline as a code.

Example:

pipeline {
    agent { docker { image 'node:16.17.1-alpine' } }
    stages {
        stage('build') {
            steps {
                sh 'node --version'
            }
        }
    }
}

• Scripted: Scripted was the first and most traditional implementation of the pipeline as a code in Jenkins. It was designed as a general-purpose DSL (Domain Specific Language) built with Groovy.

Example:

node{
    stage('Hello'){
        echo 'Hello World'
    }
}

Why should we have Pipeline in Jenkins?

• A pipeline in Jenkins offers automation, consistency, transparency, and collaboration, and enables continuous delivery, making it an essential tool for modern software development teams.

Task-01:

Create a New Job, this time select Pipeline instead of Freestyle Project.

• Creation of Pipeline Project

• Description of file

• Pipeline Script

• Console Output

This is Simple Pipeline that prints out "Hello World" in stage logs.

Writing a Declarative Pipeline in Jenkins.

• Declarative Script

• Stage View

• Console Output

Happy Learning :)