k8s StatefulSet 有状态应用编排

官方文档：

https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/

参考文档：

http://docs.kubernetes.org.cn/732.html
https://edu.aliyun.com/lesson_1651_13093?spm=5176.10731542.0.0.6cd020beIZmqB5#_13093

创建 StatefulSet

apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: web
spec:
  serviceName: "nginx"
  replicas: 2
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: gcr.io/google_containers/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

查看

kubectl get statefulset (sts)

灰度扩容

kubectl patch statefulset web -p '{"spec":{"updateStrategy":{"type":"RollingUpdate","rollingUpdate":{"partition":2}}}}'

spec:
  updateStrategy:
    rollingUpdate:
      partition: 2 #这里是要保留旧版本的数量

更新回滚镜像

记录历史 --record

kubectl  apply -f **** --record

查看当前状态

kubectl rollout status deployment/demo -w

查看历史

kubectl rollout history deployment/demo

回滚到指定版本

kubectl rollout undo deployment/demo --to-revision=2

更新镜像

kubectl set image deployment demo demoname=image:ver