System configuration management in Jenkins - Mini Project: Build & Apply

System Configuration Management with Jenkins

📖 Scenario: You are working as a DevOps engineer. Your team wants to automate the setup of a simple Jenkins job that runs a shell command to print system information. This helps ensure consistent system configuration checks across servers.

🎯 Goal: Build a Jenkins pipeline script that defines a job to run a shell command uname -a to display system information.

📋 What You'll Learn

Create a Jenkins pipeline script with a pipeline block

Define an agent to run the job on any available node

Add an environment variable SYS_COMMAND with the value uname -a

Use a stage named System Info to run the shell command stored in SYS_COMMAND

Print the output of the shell command in the Jenkins console

💡 Why This Matters

🌍 Real World

Automating system configuration checks helps teams maintain consistent environments and quickly detect issues.

💼 Career

Jenkins pipelines are widely used in DevOps roles to automate tasks like system monitoring, deployment, and testing.

1

Create the basic Jenkins pipeline structure

Write a Jenkins pipeline script starting with pipeline { and define an agent any block inside it.

Jenkins

pipeline {
    agent any
    // Your code here
}

Need a hint?

Start by writing pipeline { and inside it add agent any to run on any node.

2

Add an environment variable for the system command

Inside the pipeline block, add an environment block that defines a variable called SYS_COMMAND with the value uname -a.

Jenkins

pipeline {
    agent any
    environment {
        // Your code here
    }
}

Need a hint?

Use the environment block to set SYS_COMMAND = 'uname -a'.

3

Add a stage to run the system command

Inside the pipeline block, add a stages block with a stage named System Info. Inside this stage, add a steps block that runs the shell command stored in SYS_COMMAND using sh.

Jenkins

pipeline {
    agent any
    environment {
        SYS_COMMAND = 'uname -a'
    }
    stages {
        stage('System Info') {
            steps {
                // Your code here
            }
        }
    }
}

Need a hint?

Use sh SYS_COMMAND inside the steps block to run the command.

4

Print the output of the system command

Add a script block inside the steps of the System Info stage. Use def output = sh(script: SYS_COMMAND, returnStdout: true).trim() to capture the command output, then print it with echo output.

Jenkins

pipeline {
    agent any
    environment {
        SYS_COMMAND = 'uname -a'
    }
    stages {
        stage('System Info') {
            steps {
                // Your code here
            }
        }
    }
}

Need a hint?

Use a script block to capture the output and then print it with echo.