A city internal API must be reachable only from inside the cluster.…

Question

A city internal API must be reachable only from inside the cluster. Which Service type should the administrator choose?

Accepted Answer

ClusterIP, which exposes the Service on an internal cluster IP without publishing it on node ports or a cloud load balancer. — In-cluster only? ClusterIP is the private extension — no node-port billboard, no cloud LB.

Answer

NodePort, which is required for any in-cluster DNS name to resolve.

Answer

LoadBalancer, which is the only type that creates Endpoints for ready Pods.

Answer

ExternalName, which allocates a virtual IP inside the Pod CIDR for east-west traffic.

A city internal API must be reachable only from inside the cluster. Which Service type should the administrator choose?

Short Explanation

Full Explanation