---
apiVersion: v1
kind: Service
metadata:
  name: my-svc
  namespace: apps
spec:
  selector:
    app: nginx-web
    role: web
    state: "true"
  clusterIP: None
  ports:
  - name: http
    port: 80
    targetPort: 80
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: nginx-web
  namespace: apps
  labels:
    app: nginx
    role: web
spec:
  replicas: 2
  serviceName: my-svc
  selector:
    matchLabels:
      app: nginx-web
      role: web
      state: "true"
  template:
    metadata:
      labels:
        app: nginx-web
        role: web
        state: "true"
    spec:
      containers:
      - name: nginx-web
        image: linuxduduniao/nginx:v1.0.0
        ports:
        - name: http
          containerPort: 80
        readinessProbe:
          httpGet:
            port: 80
            path: /health
        volumeMounts:
        - name: nginx-web
          mountPath: /usr/share/nginx/html
  volumeClaimTemplates:
  - metadata:
      name: nginx-web
      namespace: apps
    spec:
      accessModes: ["ReadWriteOnce"]
      resources:
        requests:
          storage: 2Gi      
      storageClassName: managed-nfs-storage # nfs classstorage,参考https://www.yuque.com/duduniao/k8s/vgms23#3W9oz

[root@duduniao local-k8s-yaml]# kubectl -n apps get sts -o wide # 当前sts 状态
NAME        READY   AGE   CONTAINERS   IMAGES
nginx-web   2/2     19s   nginx-web    linuxduduniao/nginx:v1.0.0
[root@duduniao local-k8s-yaml]# kubectl -n apps get pod -o wide # 注意Pod名称
NAME          READY   STATUS    RESTARTS   AGE   IP             NODE          NOMINATED NODE   READINESS GATES
nginx-web-0   1/1     Running   0          86s   172.16.4.158   centos-7-55   <none>           <none>
nginx-web-1   1/1     Running   0          77s   172.16.3.98    centos-7-54   <none>           <none>
[root@duduniao local-k8s-yaml]# kubectl -n apps get pvc -o wide # 注意pvc名称
NAME                    STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS          AGE   VOLUMEMODE
nginx-web-nginx-web-0   Bound    pvc-b36b90f1-a268-4815-b55b-6f7fda587193   2Gi        RWX            managed-nfs-storage   93s   Filesystem
nginx-web-nginx-web-1   Bound    pvc-1461c537-e784-41fd-9e78-b1e6b212912c   2Gi        RWX            managed-nfs-storage   84s   Filesystem
[root@duduniao local-k8s-yaml]# kubectl -n apps get pv -o wide # 注意pv名称
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                        STORAGECLASS          REASON   AGE   VOLUMEMODE
pvc-1461c537-e784-41fd-9e78-b1e6b212912c   2Gi        RWX            Delete           Bound    apps/nginx-web-nginx-web-1   managed-nfs-storage            88s   Filesystem
pvc-b36b90f1-a268-4815-b55b-6f7fda587193   2Gi        RWX            Delete           Bound    apps/nginx-web-nginx-web-0   managed-nfs-storage            97s   Filesystem
[root@duduniao local-k8s-yaml]# kubectl -n apps describe svc my-svc
Name:              my-svc
Namespace:         apps
Labels:            <none>
Annotations:       Selector:  app=nginx-web,role=web,state=true
Type:              ClusterIP
IP:                None
Port:              http  80/TCP
TargetPort:        80/TCP
Endpoints:         172.16.3.98:80,172.16.4.158:80
Session Affinity:  None
Events:            <none>
[root@centos-7-51 ~]# dig -t A my-svc.apps.svc.cluster.local @10.96.0.10 +short   # 无头服务特性，用于服务发现
172.16.4.216
172.16.3.105
[root@centos-7-51 ~]# dig -t A nginx-web-0.my-svc.apps.svc.cluster.local @10.96.0.10 +short # statefulset 特性，可以用pod名称解析到Pod的地址
172.16.4.216
[root@centos-7-51 ~]# dig -t A nginx-web-1.my-svc.apps.svc.cluster.local @10.96.0.10 +short
172.16.3.105