Container Orchestration with Kubernetes

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Kubernetes Networking

A brief overview of various types of services in Kubernetes:

ClusterIP Service: Exposes the Service on a cluster-internal IP. It’s accessible only within the cluster.

apiVersion: v1
kind: Service
metadata:
  name: my-clusterip-service
spec:
  selector:
    app: my-app
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8080
  type: ClusterIP

NodePort Service: Exposes the Service on each Node’s IP at a static port. It’s accessible externally using the Node’s IP and the specified NodePort.

apiVersion: v1
kind: Service
metadata:
  name: my-nodeport-service
spec:
  selector:
    app: my-app
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8080
      nodePort: 30001
  type: NodePort

LoadBalancer Service: Exposes the Service externally using a cloud provider’s load balancer. The service gets an externally-accessible IP.

apiVersion: v1
kind: Service
metadata:
  name: my-loadbalancer-service
spec:
  selector:
    app: my-app
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8080
  type: LoadBalancer

ExternalName Service: Maps the service to the contents of the externalName field (e.g., a DNS name).

apiVersion: v1
kind: Service
metadata:
  name: my-externalname-service
spec:
  externalName: my.database.example.com
  ports:
    - protocol: TCP
      port: 3306
      targetPort: 3306
  type: ExternalName

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