== Discovery for Kubernetes

`KUBE_PING` is a discovery protocol for JGroups cluster nodes managed by Kubernetes.
Since Kubernetes is in charge of launching nodes, it knows the addresses of all pods it started,
and is therefore an ideal place to ask for cluster discovery.
Discovery is therefore done by asking Kubernetes for a list of addresses of all cluster nodes.
Combined with `bind_port` / `port_range`, the protocol will then send a discovery request to all instances and wait for the responses.

To reconfigure an existing server profile with `KUBE_PING` use the following CLI batch replacing the namespace,
labels and stack name (`tcp`) with the target stack:

[source,options="nowrap"]
----
batch
/subsystem=jgroups/stack=tcp/protocol=MPING:remove()
/subsystem=jgroups/stack=tcp/protocol=kubernetes.KUBE_PING:add(add-index=0,properties={namespace="production",labels="cluster=nyc"})
run-batch
----

NOTE: To be able to query the Kubernetes server ensure view permissions are granted on the service account.

For advanced configuration options, please visit protocol's documentation https://github.com/jgroups-extras/jgroups-kubernetes/blob/master/README.adoc[here].
