Exposing A Deployment

Every Pod gets its own IP address, but Pods come and go: scale, update or roll back and the addresses change. A Service gives a group of Pods one stable name and IP address, and spreads traffic across them.

The quickest way to create one is to expose a Deployment:

kubectl expose deployment web --port=80

Kubernetes answers service/web exposed. The Service is named after the Deployment and sends traffic on port 80 to its Pods.

List Services with kubectl get services (short form svc). Each has a TYPE, a CLUSTER-IP that never changes, and its PORT(S). Inside the cluster, other Pods reach it simply as http://web: the name is resolved by the cluster's DNS.