mc-router

Flags:
  --help                     Show context-sensitive help (also try --help-long
                             and --help-man).
  --port=25565               The port bound to listen for Minecraft client
                             connections
  --api-binding=API-BINDING  The host:port bound for servicing API requests
  --mapping=MAPPING ...      Mapping of external hostname to internal server
                             host:port

REST API

GET /routes Retrieves the currently configured routes
POST /routes Registers a route given a JSON body structured like:

{
  "serverAddress": "CLIENT REQUESTED SERVER ADDRESS",
  "backend": "HOST:PORT"
}

DELETE /routes/{serverAddress} Deletes an existing route for the given serverAddress

Example kubernetes deployment

This example deployment

Declares an mc-router service that exposes a node port 25565
Declares a service account with access to watch and list services
Declares --in-kube-cluster in the mc-router container arguments
Two "backend" Minecraft servers are declared each with an "mc-router.itzg.me/externalServerName" annotation that declares their external server name

kubectl apply -f https://raw.githubusercontent.com/itzg/mc-router/master/docs/k8s-example-auto.yaml

Notes

This deployment assumes two persistent volume claims: mc-stable and mc-snapshot
I extended the allowed node port range by adding --service-node-port-range=25000-32767 to /etc/kubernetes/manifests/kube-apiserver.yaml