Added kustomize base files (#1800)

kustomize/README.md

@@ -0,0 +1,22 @@
+This directory provides a base to use with [kubectl kustomize](https://kubernetes.io/docs/tasks/manage-kubernetes-objects/kustomization/).
+
+## Example overlay content
+
+### kustomization.yml
+```yaml
+nameSuffix: "-forge"
+commonLabels:
+  server: forge
+bases:
+  - https://github.com/itzg/docker-minecraft-server.git/kustomize/base
+configMapGenerator:
+  - name: mc
+    envs:
+      - mc.env
+```
+
+### mc.env
+```
+EULA=true
+TYPE=FORGE
+```

kustomize/base/kustomization.yml

@@ -0,0 +1,3 @@
+resources:
+- statefulset.yml
+- service.yml

kustomize/base/service.yml

@@ -0,0 +1,17 @@
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    service: mc
+  annotations: {}
+  # Such as
+  #   mc-router.itzg.me/externalServerName: $(EXTERNAL_SERVICE_NAME)
+  name: mc
+spec:
+  ports:
+    - name: minecraft
+      port: 25565
+      targetPort: 25565
+  type: NodePort
+  selector:
+    server: mc

kustomize/base/statefulset.yml

@@ -0,0 +1,51 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: mc
+spec:
+  replicas: 1
+  serviceName: mc
+  selector:
+    matchLabels:
+      server: mc
+  template:
+    metadata:
+      labels:
+        server: mc
+    spec:
+      containers:
+        - name: mc
+          envFrom:
+            - configMapRef:
+                name: mc
+                optional: true
+          env: []
+          image: itzg/minecraft-server
+          stdin: true
+          tty: true
+          volumeMounts:
+            - mountPath: /data
+              name: data
+          resources:
+            requests:
+              cpu: 150m
+          livenessProbe:
+            exec:
+              command: ["mc-health"]
+            initialDelaySeconds: 120
+            periodSeconds: 60
+          readinessProbe:
+            exec:
+              command: ["mc-health"]
+            initialDelaySeconds: 20
+            periodSeconds: 10
+            failureThreshold: 12
+  volumeClaimTemplates:
+    - metadata:
+        name: data
+      spec:
+        accessModes:
+          - ReadWriteOnce
+        resources:
+          requests:
+            storage: 500Mi