Kubernetes Service

A Service selects pods by label and gives them one stable address and DNS name, load balancing across the pods that are Ready. Types: ClusterIP (inside the cluster), NodePort, LoadBalancer, ExternalName and headless. Part of Kubernetes.

Key concepts #

• Selector and endpoints: the Service sends traffic to the endpoints of ready pods; an empty list is the first thing to check.
• Ports: port, targetPort and nodePort.
• DNS: name.namespace.svc.cluster.local.
• Ingress: HTTP routing on top of Services, see Ingress.

Learn it #

Read Services and Ingress and the NodePort tutorial.