Service Types

Code

# service.yaml
apiVersion: v1
kind: Service
metadata:
  name: api
spec:
  type: ClusterIP        # default, internal only
  selector:
    app: api
  ports:
    - port: 80           # service port
      targetPort: 8080   # container port
      protocol: TCP

---
# Headless service for StatefulSet DNS
apiVersion: v1
kind: Service
metadata:
  name: api-headless
spec:
  clusterIP: None
  selector: { app: api }
  ports: [{ port: 80, targetPort: 8080 }]

# kubectl get svc
# kubectl get endpoints api

Explanation

A Service exposes a stable IP and DNS name that load-balances across matching Pods. ClusterIP is the default and is reachable only inside the cluster, while NodePort and LoadBalancer expose it externally. Setting clusterIP to None creates a headless service used by StatefulSets for per-pod DNS.

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