DevOps, Day

As we previously used a Jenkins Freestyle project, today we will be selecting a Jenkins Pipeline instead...

So first let's see what Jenkins's declarative pipeline means..!

Pipeline:
- A Pipeline is a set of connected tasks, like steps in a recipe, that automatically build and deploy your software.
Declarative:
- Declarative is the easy way to list those steps in plain language, making it clear and simple to understand.
Scripted:
- Scripted is a more technical way to list the steps, like writing a detailed plan in a specific coding language (Groovy).

Why You Should Have A Pipeline?

A Jenkins Pipeline is like a recipe for building and deploying software. It's written in a file (called a Jenkinsfile) that can be stored with your project's code.

When you create a Jenkinsfile and store it with your code, it brings several advantages:

Automated Builds: It automatically sets up the process for building your software whenever changes are made to your code.
Code Review: You can review and improve the build process, just like you review and improve your code.

Pipeline Syntax

pipeline {
    agent any

    stages {
        stage('Build') {
            steps {
                sh 'echo "Building the software"'
                // Add your actual build commands here
            }
        }

        stage('Test') {
            steps {
                sh 'echo "Testing the software"'
                // Add your actual test commands here
            }
        }

        stage('Deploy') {
            steps {
                sh 'echo "Deploying the software"'
                // Add your actual deployment commands here
            }
        }
    }
}

Let's Complete the Hello World Example, by following the steps given in this documentation --> Link

Step 1: Click on localhost:8080

Step 2: Click on my blog link to install Jenkins --> link

Step 3: Create a New Jenkins Pipeline

Click on "New Item" on the Jenkins homepage.
Enter a name for your pipeline (e.g., "HelloWorld") --> Choose "Pipeline" as the project type --> Click "OK."

Step 4: Configure the Pipeline

In the pipeline configuration, scroll down to the "Pipeline" section.
Select the "Pipeline script" option.
Copy and paste the example pipeline code from the Jenkins official website into the script block.

Here's the code from the official example:

pipeline {
    agent any
    stages {
        stage('Hello') {
            steps {
                echo 'Hello, world!'
            }
        }
    }
}