kubenete滚动升级版本动态扩缩容

傷城~ 2022-10-16 07:13 160阅读 0赞

# 一 滚动升级 #

根据资源编排文件部署一个Nginx应用，指定其版本为1.14，副本数为2个，对其升级为1.15，这个资源描述文件可以生成，然后修改副本数和nginx版本

apiVersion: apps/v1
    kind: Deployment
    metadata:
      annotations:
        deployment.kubernetes.io/revision: "1"
      creationTimestamp: "2021-05-26T14:05:03Z"
      generation: 1
      labels:
        app: web
      managedFields:
      - apiVersion: apps/v1
        fieldsType: FieldsV1
        fieldsV1:
          f:metadata:
            f:labels:
              .: {}
              f:app: {}
          f:spec:
            f:progressDeadlineSeconds: {}
            f:replicas: {}
            f:revisionHistoryLimit: {}
            f:selector:
              f:matchLabels:
                .: {}
                f:app: {}
            f:strategy:
              f:rollingUpdate:
                .: {}
                f:maxSurge: {}
                f:maxUnavailable: {}
              f:type: {}
            f:template:
              f:metadata:
                f:labels:
                  .: {}
                  f:app: {}
              f:spec:
                f:containers:
                  k:{"name":"nginx"}:
                    .: {}
                    f:image: {}
                    f:imagePullPolicy: {}
                    f:name: {}
                    f:resources: {}
                    f:terminationMessagePath: {}
                    f:terminationMessagePolicy: {}
                f:dnsPolicy: {}
                f:restartPolicy: {}
                f:schedulerName: {}
                f:securityContext: {}
                f:terminationGracePeriodSeconds: {}
        manager: kubectl
        operation: Update
        time: "2021-05-26T14:05:03Z"
      - apiVersion: apps/v1
        fieldsType: FieldsV1
        fieldsV1:
          f:metadata:
            f:annotations:
              .: {}
              f:deployment.kubernetes.io/revision: {}
          f:status:
            f:availableReplicas: {}
            f:conditions:
              .: {}
              k:{"type":"Available"}:
                .: {}
                f:lastTransitionTime: {}
                f:lastUpdateTime: {}
                f:message: {}
                f:reason: {}
                f:status: {}
                f:type: {}
              k:{"type":"Progressing"}:
                .: {}
                f:lastTransitionTime: {}
                f:lastUpdateTime: {}
                f:message: {}
                f:reason: {}
                f:status: {}
                f:type: {}
            f:observedGeneration: {}
            f:readyReplicas: {}
            f:replicas: {}
            f:updatedReplicas: {}
        manager: kube-controller-manager
        operation: Update
        time: "2021-05-26T14:05:19Z"
      name: web
      namespace: default
      resourceVersion: "92795"
      selfLink: /apis/apps/v1/namespaces/default/deployments/web
      uid: f7d3da76-4493-4288-b3a8-ef724c0a739c
    spec:
      progressDeadlineSeconds: 600
      replicas: 2
      revisionHistoryLimit: 10
      selector:
        matchLabels:
          app: web
      strategy:
        rollingUpdate:
          maxSurge: 25%
          maxUnavailable: 25%
        type: RollingUpdate
      template:
        metadata:
          creationTimestamp: null
          labels:
            app: web
        spec:
          containers:
          - image: nginx:1.14
            imagePullPolicy: Always
            name: nginx
            resources: {}
            terminationMessagePath: /dev/termination-log
            terminationMessagePolicy: File
          dnsPolicy: ClusterFirst
          restartPolicy: Always
          schedulerName: default-scheduler
          securityContext: {}
          terminationGracePeriodSeconds: 30
    status:
      availableReplicas: 1
      conditions:
      - lastTransitionTime: "2021-05-26T14:05:19Z"
        lastUpdateTime: "2021-05-26T14:05:19Z"
        message: Deployment has minimum availability.
        reason: MinimumReplicasAvailable
        status: "True"
        type: Available
      - lastTransitionTime: "2021-05-26T14:05:03Z"
        lastUpdateTime: "2021-05-26T14:05:19Z"
        message: ReplicaSet "web-5dcb957ccc" has successfully progressed.
        reason: NewReplicaSetAvailable
        status: "True"
        type: Progressing
      observedGeneration: 1
      readyReplicas: 1
      replicas: 1
      updatedReplicas: 1

使用这个资源编排文件生成应用 web

[root@k8smaster ~]# kubectl apply -f web.yaml

[root@k8smaster ~]# kubectl get pods
    NAME                   READY   STATUS    RESTARTS   AGE
    web-66bf4959f5-kfktx   1/1     Running   0          76s
    web-66bf4959f5-mflm9   1/1     Running   0          76s

# 滚动升级到1.15
    [root@k8smaster ~]# kubectl set image deploy web nginx=nginx:1.15

# 查看升级状态
    [root@k8smaster ~]# kubectl rollout status deploy web
    deployment "web" successfully rolled out

# 查看版本历史
    [root@k8smaster ~]# kubectl rollout history deploy web
    deployment.apps/web
    REVISION  CHANGE-CAUSE
    1         <none>
    2         <none>

# 回滚到上一个版本
    [root@k8smaster ~]# kubectl rollout undo deploy web
    deployment.apps/web rolled back
    
    
    # 回滚到指定版本
    [root@k8smaster ~]# kubectl rollout undo deploy web --to-revision=2
    deployment.apps/web rolled back

# 二 动态扩缩容 #

# 当前pod副本
    [root@k8smaster ~]# kubectl get pods
    NAME                  READY   STATUS    RESTARTS   AGE
    web-bbcf684cb-7g6mk   1/1     Running   0          51s
    web-bbcf684cb-rsdv4   1/1     Running   0          65s
    
    
    # 扩展副本10
    [root@k8smaster ~]# kubectl scale deploy web --replicas=10
    deployment.apps/web scaled
    
    # 查看
    [root@k8smaster ~]# kubectl get pods
    NAME                  READY   STATUS              RESTARTS   AGE
    web-bbcf684cb-29fkb   1/1     Running             0          36s
    web-bbcf684cb-6kj7n   1/1     Running             0          36s
    web-bbcf684cb-7g6mk   1/1     Running             0          2m4s
    web-bbcf684cb-bt7xd   0/1     ContainerCreating   0          36s
    web-bbcf684cb-d9b2v   0/1     ContainerCreating   0          35s
    web-bbcf684cb-hjx5c   0/1     ContainerCreating   0          36s
    web-bbcf684cb-hlkqw   0/1     ContainerCreating   0          35s
    web-bbcf684cb-rsdv4   1/1     Running             0          2m18s
    web-bbcf684cb-tj4f9   0/1     ContainerCreating   0          35s
    web-bbcf684cb-wcrzq   0/1     ContainerCreating   0          36s