🚀 Jenkins with Kubernetes: Automating Scalable Deployments

 

Jenkins with Kubernetes: Automating Scalable Deployments

As modern applications shift towards microservices and cloud-native architectures, integrating Jenkins with Kubernetes provides scalable, automated CI/CD pipelines for efficient software delivery. This guide will cover:

✅ Why use Jenkins with Kubernetes?
✅ Setting up Jenkins on Kubernetes
✅ Deploying applications using Jenkins and Kubernetes

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🌍 Why Integrate Jenkins with Kubernetes?

Kubernetes (K8s) is an orchestration platform that automates the deployment, scaling, and management of containerized applications. When combined with Jenkins, it enables:

✔️ Automated Deployments – CI/CD pipelines automatically build, test, and deploy applications on Kubernetes.
✔️ Scalability – Applications scale based on real-time demand.
✔️ Improved Resource Utilization – Dynamic scheduling optimizes container workloads.
✔️ High Availability – Kubernetes ensures app reliability with self-healing capabilities.

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🔧 Setting Up Jenkins on Kubernetes

To deploy Jenkins in Kubernetes, follow these steps:

1️⃣ Install Jenkins on Kubernetes

First, apply the Jenkins Persistent Volume (PV) and Persistent Volume Claim (PVC):

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: jenkins-pvc
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 8Gi

Now, deploy Jenkins using Helm:

helm repo add jenkinsci https://charts.jenkins.io
helm repo update
helm install jenkins jenkinsci/jenkins -f values.yaml

Get Jenkins admin password:

kubectl exec --namespace default -it svc/jenkins -c jenkins -- cat /run/secrets/chart-admin-password

Access Jenkins UI:

kubectl port-forward svc/jenkins 8080:8080

Open http://localhost:8080 in your browser and log in.

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🚀 Deploying Applications with Jenkins & Kubernetes

2️⃣ Create a Jenkins Pipeline for Kubernetes Deployment

This Jenkins pipeline will:
✅ Build a Docker image
✅ Push it to Docker Hub
✅ Deploy it on a Kubernetes cluster

pipeline {
    agent any
    environment {
        DOCKER_IMAGE = 'your-dockerhub-username/app-name:latest'
    }
    stages {
        stage('Checkout Code') {
            steps {
                git 'https://github.com/your-repo/app.git'
            }
        }
        stage('Build Docker Image') {
            steps {
                sh 'docker build -t $DOCKER_IMAGE .'
            }
        }
        stage('Push to Docker Hub') {
            steps {
                withDockerRegistry([credentialsId: 'docker-hub-credentials', url: '']) {
                    sh 'docker push $DOCKER_IMAGE'
                }
            }
        }
        stage('Deploy to Kubernetes') {
            steps {
                sh 'kubectl apply -f k8s/deployment.yaml'
            }
        }
    }
}

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🎯 Next Topic: Jenkinsfile Explained – Writing the Perfect CI/CD Pipeline

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