官方文档: https://kubernetes.io/docs/tutorials/stateful-application/basic-stateful-set/

服务类型	服务	应用场景
无状态服务	deployment	web服务
有状态服务	StatefulSet	mysql、redis等

创建StatefulSet

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:
  serviceName: "nginx"
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: k8s.gcr.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" ]
      resources:
        requests:
          storage: 1Gi

StatefulSet错误排查

Events:
  Type     Reason            Age                  From               Message
  ----     ------            ----                 ----               -------
  Warning  FailedScheduling  10s (x4 over 2m27s)  default-scheduler  pod has unbound immediate PersistentVolumeClaims

#查看pv的名字
kubectl get pv,pvc,pod

#查看具体错误
kubectl describe persistentvolumeclaim/www-web-0

Events:
  Type       Reason         Age                  From                         Message
  ----       ------         ----                 ----                         -------
  Normal     FailedBinding  49s (x263 over 65m)  persistentvolume-controller  no persistent volumes available for this claim and no storage class is set

StatefulSet如何管理pods
删除StatefulSet
扩缩容StatefulSet
升级StatefulSet的pod