Update Kubernetes.md

Add StatefulSet yaml example

kubernetes/Kubernetes.md

@@ -405,6 +405,63 @@ StatefulSet是为了解决**有状态服务**的问题（对应Deployments和Rep
 
 *有状态服务需要在本地存储持久化数据,典型的是分布式数据库的应用,分布式节点实例之间有依赖的拓扑关系.比如,主从关系. 如果K8S停止分布式集群中任 一实例pod,就可能会导致数据丢失或者集群的crash.*
 
+**创建StatefulSet**
+
+*下面例子由StatefulSet创建了3个pod来启动Nginx并创建了 Headless Service 用来控制网络域名*
+
+*注：Headless Service 不会分配负载均衡IP地址*
+```
+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx
+  labels:
+    app: nginx
+spec:
+  ports:
+  - port: 80
+    name: web
+  clusterIP: None
+  selector:
+    app: nginx
+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: web
+spec:
+  selector:
+    matchLabels:
+      app: nginx # 必须匹配 .spec.template.metadata.labels
+  serviceName: "nginx"
+  replicas: 3 # 默认值是 1
+  minReadySeconds: 10 # 默认值是 0
+  template:
+    metadata:
+      labels:
+        app: nginx # 必须匹配 .spec.selector.matchLabels
+    spec:
+      terminationGracePeriodSeconds: 10
+      containers:
+      - name: nginx
+        image: registry.k8s.io/nginx-slim:0.8
+        ports:
+        - containerPort: 80
+          name: web
+        volumeMounts:
+        - name: www
+          mountPath: /usr/share/nginx/html
+  volumeClaimTemplates:
+  - metadata:
+      name: www
+    spec:
+      accessModes: [ "ReadWriteOnce" ]
+      storageClassName: "my-storage-class"
+      resources:
+        requests:
+          storage: 1Gi
+```
+
 ## Service
 
 ### 1. Service
@@ -540,4 +597,4 @@ metadata常用的配置项有 name,namespace,即配置其显示的名字与归
 1. https://kubernetes.io/zh-cn/docs/home/  
 2. https://jimmysong.io/kubernetes-handbook/concepts/
 3. https://www.cnblogs.com/caodan01/p/15102328.html
-4. https://juejin.cn/post/7107251448034885639、
+4. https://juejin.cn/post/7107251448034885639、