Service exposition with ListenerClasses

Apache ZooKeeper offers an API. The Operator deploys a service called <name> (where <name> is the name of the ZookeeperCluster) through which ZooKeeper can be reached.

The operator deploys a Listener for the Server pods. The listener defaults to only being accessible from within the Kubernetes cluster, but this can be changed by setting .spec.servers.roleConfig.listenerClass:

spec:
  servers:
    roleConfig:
      listenerClass: external-unstable  (1)

1	Specify one of `external-stable`, `external-unstable`, `cluster-internal` (the default setting is `cluster-internal`).