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Setting Up a CI/CD Pipeline with Jenkins, Docker, and Kubernetes on Debian

Introduction

Continuous Integration and Continuous Deployment (CI/CD) are essential for modern DevOps. This guide will help you set up a robust CI/CD pipeline using Jenkins, Docker, and Kubernetes on Debian.

Prerequisites

  1. Jenkins Installation: Ensure Jenkins is installed and running. Follow the Installing Jenkins on Debian guide.
  2. Docker Installation: Install Docker by following the steps from the Setting Up Docker and Docker Compose on Linux.

Step 1: Configure Jenkins for Docker

  1. Install Docker Plugin in Jenkins: Navigate to Manage Jenkins -> Manage Plugins -> Available and install the Docker plugin.
  2. Set Up Docker in Jenkins: Go to Manage Jenkins -> Configure System and add a new Docker Cloud with your Docker host details.

Step 2: Install and Configure Kubernetes

  1. Install Kubernetes: Use the following commands to install Kubernetes:
   sudo apt-get update
   sudo apt-get install -y kubelet kubeadm kubectl
   sudo kubeadm init
  1. Deploy a Kubernetes Cluster: Follow the steps in the Deploying a Kubernetes Cluster on Debian.

Step 3: Create a Jenkins Pipeline

  1. Create a New Pipeline: In Jenkins, create a new pipeline job and configure it to use your Git repository.
  2. Define Your Pipeline Script: Use a Jenkinsfile in your repository to define the pipeline stages:
   pipeline {
       agent any
       stages {
           stage('Build') {
               steps {
                   script {
                       docker.build('my-app')
                   }
               }
           }
           stage('Deploy to Kubernetes') {
               steps {
                   script {
                       sh 'kubectl apply -f k8s-deployment.yaml'
                   }
               }
           }
       }
   }

Step 4: Deploy to Kubernetes

  1. Create Kubernetes Deployment File: Define your deployment in a k8s-deployment.yaml file.
   apiVersion: apps/v1
   kind: Deployment
   metadata:
     name: my-app
   spec:
     replicas: 2
     selector:
       matchLabels:
         app: my-app
     template:
       metadata:
         labels:
           app: my-app
       spec:
         containers:
         - name: my-app
           image: my-app:latest
           ports:
           - containerPort: 80
  1. Deploy Using Jenkins: The Jenkins pipeline will handle deploying the Docker image to Kubernetes.

Conclusion

By following this guide, you can set up a CI/CD pipeline with Jenkins, Docker, and Kubernetes on Debian, streamlining your development and deployment processes. For more detailed steps and related configurations, refer to the linked articles on LinuxExpert.org.

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