Deploying Jenkins on Kubernetes

We will walk you through deploying Jenkins on a Kubernetes cluster using a dedicated namespace, NodePort service, and a single deployment.

Create a Namespace for Jenkins

kubectl create namespace jenkins        

This creates a namespace named jenkins to isolate Jenkins resources from other applications in our cluster.

Create a NodePort Service

We will use the imperative approach, and then save it to a manifest file for some changes.

kubectl create service nodeport  jenkins-service  -n jenkins --tcp 8080:8080 \
--dry-run=client -o yaml > jenkins-service.yaml        

Final service object

apiVersion: v1
kind: Service
metadata:
  labels:
    app: jenkins
  name: jenkins-service
  namespace: jenkins
spec:
  ports:
  - port: 8080
    protocol: TCP
    targetPort: 8080
    nodePort: 30008
  selector:
    app: jenkins
  type: NodePort        

selector: Labels to select pods for exposing the service. Here, pods with the label app: jenkins will be included

Create a Jenkins Deployment

Like with the service, we will use the imperative approach and save it to a file.

kubectl create deployment jenkins-deployment -n jenkins --replica=1 \
--image=jenkins/jenkins --port 8080 --dry-run=client -o yaml > jenkins-deployment.yaml        

Final deployment object

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: jenkins
  name: jenkins-deployment
  namespace: jenkins
spec:
  replicas: 1
  selector:
    matchLabels:
      app: jenkins
  strategy: {}
  template:
    metadata:
      labels:
        app: jenkins
    spec:
      containers:
      - image: jenkins/jenkins
        name: jenkins
        ports:
        - containerPort: 8080        

selector: Labels to identify pods managed by our deployment. labels: Labels for the pod template (app: jenkins).

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