9、kubernetes之statefulset控制器

拼搏现实的明天。 2023-08-17 16:53 80阅读 0赞

### 一、StatefulSet 有状态副本集 ###

*  必要的三个组件：headless service、StatefulSet、volumeClaimTemplate
 *  准备pv

apiVersion: v1
    kind: PersistentVolume
    metadata:
      name: pv001
      labels:
        name: pv001
    spec:
      nfs:
        path: /data/volumes/v1
        server: 192.168.100.1
      accessModes: ["ReadWriteOnce"]
      capacity:
        storage: 5Gi
    ---
    apiVersion: v1
    kind: PersistentVolume
    metadata:
      name: pv002
      labels:
        name: pv002
    spec:
      nfs:
        path: /data/volumes/v2
        server: 192.168.100.1
      accessModes: ["ReadWriteOnce"]
      capacity:
        storage: 5Gi
    ---
    apiVersion: v1
    kind: PersistentVolume
    metadata:
      name: pv003
      labels:
        name: pv003
    spec:
      nfs:
        path: /data/volumes/v3
        server: 192.168.100.1
      accessModes: ["ReadWriteOnce"]
      capacity:
        storage: 5Gi
    ---
    apiVersion: v1
    kind: PersistentVolume
    metadata:
      name: pv004
      labels:
        name: pv004
    spec:
      nfs:
        path: /data/volumes/v4
        server: 192.168.100.1
      accessModes: ["ReadWriteOnce"]
      capacity:
        storage: 5Gi
    ---
    apiVersion: v1
    kind: PersistentVolume
    metadata:
      name: pv005
      labels:
        name: pv005
    spec:
      nfs:
        path: /data/volumes/v5
        server: 192.168.100.1
      accessModes: ["ReadWriteOnce"]
      capacity:
        storage: 5Gi

*  创建3个有状态副本（使用nginx模拟）

apiVersion: v1
    kind: Service
    metadata:
      name: myapp
      labels:
        app: myapp
    spec:
      ports:
      - port: 80
        name: web
      clusterIP: None
      selector:
        app: myapp-pod
    ---
    apiVersion: apps/v1
    kind: StatefulSet
    metadata:
      name: myapp
    spec:
      serviceName: myapp
      replicas: 3
      selector:
        matchLabels:
          app: myapp-pod
      template:
        metadata:
          labels:
            app: myapp-pod
        spec:
          containers:
          - name: myapp
            image: dongfeimg/myapp:v1
            ports:
            - containerPort: 80
              name: web
            volumeMounts:
            - name: myappdata
              mountPath: /usr/share/nginx/html
      volumeClaimTemplates:
      - metadata:
          name: myappdata
        spec:
          accessModes: ["ReadWriteOnce"]
          resources:
            requests:
              storage: 5Gi

### 二、滚动更新 ###

*  扩容/缩容

# kubectl scale sts myapp --replicas=5

# kubectl patch sts myapp -p '{"spec":{"replicas":2}}'

*  更新

# kubectl patch sts myapp -p '{"spec":{"updateStrategy":{"rollingUpdate":{partition":4}}}}'  #修改更新分区；
    # kubectl set image sts/myapp myapp=dongfeimg/myapp:v2

> 更新分区："partition":4
> 
> 代表pod序号大于等于4的pod做滚动更新，更新时倒序更新

转载于:https://www.cnblogs.com/L-dongf/p/11442253.html