A Service

A Service gives the Pods a stable in-cluster address. Pods are ephemeral — they get new IP addresses when they restart. A Service has a fixed ClusterIP and load-balances requests across all Pods whose labels match its selector.

Create service.yaml

apiVersion: v1
kind: Service
metadata:
  name: web
spec:
  selector:
    app: web
  ports:
    - port: 8080
      targetPort: 80

The Service listens on port 8080 inside the cluster and forwards traffic to port 80 on each matching Pod (the port nginx listens on).

Apply and verify

kubectl apply -f service.yaml
kubectl get service web   # ClusterIP + port 8080

The ClusterIP column shows the stable virtual IP assigned to this Service. The PORT(S) column shows 8080/TCP.

Checkpoint: kubectl get service web shows a ClusterIP address and 8080/TCP in the PORT(S) column.

Next: 06 Reach the app