Jenkins Declarative Pipeline (06) : Day - 44

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One of the most important parts of your DevOps and CICD journey is a Declarative Pipeline Syntax of Jenkins

Some terms for your Knowledge

What is a Pipeline - A pipeline is a collection of steps or jobs interlinked in a sequence.

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

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.

Why you should have a Pipeline?

The definition of a Jenkins Pipeline is written into a text file (called a Jenkinsfile) which in turn can be committed to a projectโ€™s source control repository.
This is the foundation of "Pipeline-as-code"; treating the CD pipeline as a part of the application to be versioned and reviewed like any other code.

Creating a Jenkinsfile and committing it to source control provides several immediate benefits:

  • Automatically creates a Pipeline build process for all branches and pull requests.

  • Code review/iteration on the Pipeline (along with the remaining source code).

Pipeline syntax

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pipeline {
    agent any 
    stages {
        stage('Build') { 
            steps {
                // 
            }
        }
        stage('Test') { 
            steps {
                // 
            }
        }
        stage('Deploy') { 
            steps {
                // 
            }
        }
    }
}

Task-01: Jenkins "Hello World" Declarative Pipeline

  • Create a New Job, this time select Pipeline instead of Freestyle Project.
  1. Click on "New Item" to create a new Jenkins job.

  2. Enter Job Details:

    • Provide a name for the job (e.g., "Hello-World").

    • Choose "Pipeline" as the job type.

  3. Add a description of this project

  4. Configure Pipeline: In the pipeline configuration section: Write declarative pipeline code

  5. Save pipeline configurations and run the pipeline job by clicking on "Build Now."

  6. See the console output

"Thank you for reading my blog! Happy Learning!!!๐Ÿ˜Š

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