ClusterIP Service

Internal-only Service — pods talk to each other inside the cluster without exposing ports publicly

📋Configuration Files

deployment.yml

yaml

1apiVersion: apps/v1
2kind: Deployment
3metadata:
4  name: api-deploy
5  labels:
6    app: api-deploy
7spec:
8  replicas: 2
9  selector:
10    matchLabels:
11      app: api-deploy
12  template:
13    metadata:
14      labels:
15        app: api-deploy
16    spec:
17      containers:
18        - name: api
19          image: nginx:alpine
20          ports:
21            - containerPort: 80

service-clusterip.yml

ClusterIP — reachable only inside the cluster (default Service type)

yaml

1apiVersion: v1
2kind: Service
3metadata:
4  name: api-clusterip
5  labels:
6    app: api-deploy
7spec:
8  type: ClusterIP
9  selector:
10    app: api-deploy
11  ports:
12    - port: 80
13      targetPort: 80
14      protocol: TCP

📄

Step 01

Apply ClusterIP Service

(01)Deploy and verify internal DNS

Linux

1kubectl apply -f deployment.yml
2kubectl apply -f service-clusterip.yml
3kubectl get svc api-clusterip
4# Test from another pod:
5kubectl run curl --rm -it --image=curlimages/curl -- curl -s http://api-clusterip