docs: document auto service discovery example

docs/k8s-example.yaml

@@ -1,5 +1,32 @@
 ---
 apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: mc-router
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: services-watcher
+rules:
+- apiGroups: [""]
+  resources: ["services"]
+  verbs: ["watch","list"]
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: mc-router-services-watcher
+subjects:
+- kind: ServiceAccount
+  name: mc-router
+  namespace: default
+roleRef:
+  kind: ClusterRole
+  name: services-watcher
+  apiGroup: rbac.authorization.k8s.io
+---
+apiVersion: v1
 kind: Service
 metadata:
   name: mc-router
@@ -27,15 +54,18 @@ spec:
   selector:
     matchLabels:
       run: mc-router
+  strategy:
+    type: Recreate
   template:
     metadata:
       labels:
         run: mc-router
     spec:
+      serviceAccountName: mc-router
       containers:
-      - image: itzg/mc-router:1.0.1
+      - image: itzg/mc-router:1.1.1
         name: mc-router
-        args: ["--api-binding", ":8080"]
+        args: ["--api-binding", ":8080", "--in-kube-cluster"]
         ports:
         - name: proxy
           containerPort: 25565
@@ -46,6 +76,8 @@ apiVersion: v1
 kind: Service
 metadata:
   name: mc-stable
+  annotations:
+    "mc-router.itzg.me/externalServerName": "mc.your.domain"
 spec:
   ports:
   - port: 25565
@@ -90,6 +122,8 @@ apiVersion: v1
 kind: Service
 metadata:
   name: mc-snapshot
+  annotations:
+    "mc-router.itzg.me/externalServerName": "mc-snapshot.your.domain"
 spec:
   ports:
   - port: 25565