k8s入门（二）之Deployment、DaemonSet、Job、CronJob

一、Deployment使用

状态：Available部署完成，Progressing进行中，Complete已经完成，Failed失败的
失败原因：Quota不足，ReadingnessProbe失败，image pull失败，Limit Ranges范围，应用程序运行错误

1、创建nginx deploy

[root@master01 ~]# cat nginx-deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
        
[root@master01 ~]# kubectl get pod --show-labels
NAME                                READY   STATUS    RESTARTS   AGE     LABELS
nginx-deployment-66b9f7ff85-2mqpj   1/1     Running   0          1m13s   app=nginx,pod-template-hash=66b9f7ff85
nginx-deployment-66b9f7ff85-d9rqv   1/1     Running   0          1m13s   app=nginx,pod-template-hash=66b9f7ff85
nginx-deployment-66b9f7ff85-db8fk   1/1     Running   0          1m13s   app=nginx,pod-template-hash=66b9f7ff85

2、更新版本

（1）通过set修改

[root@master01 ~]# kubectl get deployment -o wide
NAME               READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS   IMAGES         SELECTOR
nginx-deployment   3/3     3            3           15m   nginx        nginx:latest   app=nginx
[root@master01 ~]# kubectl set image deployment/nginx-deployment nginx=nginx:1.18
deployment.apps/nginx-deployment image updated
[root@master01 ~]# kubectl get deployment -o wide
NAME               READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS   IMAGES       SELECTOR
nginx-deployment   3/3     1            3           15m   nginx        nginx:1.18   app=nginx

（2）通过edit修改

[root@master01 ~]# kubectl edit deployment nginx-deployment
[root@master01 ~]# kubectl get deployment -o wide
NAME               READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS   IMAGES       SELECTOR
nginx-deployment   3/3     1            3           17m   nginx        nginx:1.19   app=nginx

[root@master01 ~]# kubectl rollout status deployment nginx-deployment      #查看更新状态
deployment "nginx-deployment" successfully rolled out

在这里插入图片描述

3、发布策略

（1）Recreate

. 此技术意味着服务的停机时间取决于应用程序的关闭和启动持续时间


[root@master01 ~]# cat nginx-deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  strategy:
    rollingUpdate:
    type: Recreate
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.19
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80

[root@master01 ~]# kubectl apply -f nginx-deploy.yaml
[root@master01 ~]# kubectl get pod -w     #开另外一个terminal查看过程

（2）滚动更新(rolling-update)

滚动更新通过逐个替换实例来逐步部署新版本的应用，直到所有实例都被替换完成为止。

[root@master01 ~]# cat nginx-deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.19
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80

[root@master01 ~]# kubectl apply -f nginx-deploy.yaml

4、回滚

[root@master01 ~]# kubectl set image deployment/nginx-deployment nginx=nginx:1.19  --record=true    #更新记录方便回滚
[root@master01 ~]# kubectl rollout history deployment nginx-deployment    #查看历史
deployment.apps/nginx-deployment
REVISION  CHANGE-CAUSE
2         <none>
4         <none>
7         kubectl set image deployment/nginx-deployment nginx=nginx:1.19 --record=true

[root@master01 ~]# kubectl rollout history deployment nginx-deployment --revision=7  #查看细节
deployment.apps/nginx-deployment with revision #7
Pod Template:
  Labels:       app=nginx
        pod-template-hash=6f777cb8b7
  Annotations:  kubernetes.io/change-cause: kubectl set image deployment/nginx-deployment nginx=nginx:1.19 --record=true
  Containers:
   nginx:
    Image:      nginx:1.19
    Port:       80/TCP
    Host Port:  0/TCP
    Environment:        <none>
    Mounts:     <none>
  Volumes:      <none>

[root@master01 ~]# kubectl rollout undo deployment nginx-deployment      #回滚上一个版本
[root@master01 ~]# kubectl rollout undo undo deployment nginx-deployment --to-revision=7  #回滚指定版本

5、添加注释

（1）通过命令

[root@master01 ~]# kubectl annotate deployments.apps nginx-deployment kubernetes.io/change-cause="image update to 1.19"   #写注释

（2）通过文件


[root@master01 ~]# cat nginx-deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  annotations:
    kubernetes.io/change-cause: "Image update to 1.19"
  labels:
    app: nginx
spec:
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  revisionHistoryLimit: 20
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.19
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80

[root@master01 ~]# kubectl apply -f nginx-deploy.yaml
[root@master01 ~]# kubectl describe deployment nginx-deployment

在这里插入图片描述

6、patch操作

[root@master01 ~]# cat nginx-deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  annotations:
    kubernetes.io/change-cause: "Image update to latest"
  labels:
    app: nginx
spec:
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
  replicas: 10
  selector:
    matchLabels:
      app: nginx
  revisionHistoryLimit: 20
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80

[root@master01 ~]# kubectl apply -f nginx-deploy.yaml
[root@master01 ~]# kubectl patch deployments.apps nginx-deployment --type=json -p='[{"op":"replace","path":"/spec/template/spec/containers/0/image","value":"nginx:1.19"}]'

[root@master01 ~]# kubectl get deployment  -owide
NAME               READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS   IMAGES       SELECTOR
nginx-deployment   10/10    10           10           3h    nginx        nginx:1.19   app=nginx

[root@master01 ~]# kubectl patch deployments.apps nginx-deployment -p '{"spec":{"replicas":3}}'
[root@master01 ~]# kubectl get deployment  -owide
NAME               READY   UP-TO-DATE   AVAILABLE   AGE    CONTAINERS   IMAGES       SELECTOR
nginx-deployment   3/3     3            3           3h4m   nginx        nginx:1.19   app=nginx

7、通过不同文件更新

[root@master01 ~]# kubectl delete -f nginx-deploy.yaml
[root@master01 ~]# cat nginx-deploy-v2.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  annotations:
    kubernetes.io/change-cause: "Image update to latest"
  labels:
    app: nginx
spec:
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
  replicas: 10
  selector:
    matchLabels:
      app: nginx
  revisionHistoryLimit: 20
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.21
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80

[root@master01 ~]# kubectl delete -f nginx-deploy.yaml
[root@master01 ~]# kubectl replace -f nginx-deploy-v2.yaml

8、副本数量操作

如果总数为10
maxUnavailable: 10 -（10*25%）向下取整，结果为8
maxSurge = 10 + （10*25%）向上取整，结果为13

[root@master01 ~]# kubectl apply -f nginx-deploy.yaml
[root@master01 ~]# kubectl get pod
NAME                                READY   STATUS    RESTARTS   AGE
nginx-deployment-66b9f7ff85-5cs67   1/1     Running   0          5s
nginx-deployment-66b9f7ff85-6jkq8   1/1     Running   0          5s
nginx-deployment-66b9f7ff85-6pv4x   1/1     Running   0          5s
nginx-deployment-66b9f7ff85-8s8mm   1/1     Running   0          5s
nginx-deployment-66b9f7ff85-hhv97   1/1     Running   0          5s
nginx-deployment-66b9f7ff85-htkwj   1/1     Running   0          5s
nginx-deployment-66b9f7ff85-j8h22   1/1     Running   0          5s
nginx-deployment-66b9f7ff85-k7fwn   1/1     Running   0          5s
nginx-deployment-66b9f7ff85-n7fdn   1/1     Running   0          5s
nginx-deployment-66b9f7ff85-zzsqb   1/1     Running   0          5s

[root@master01 ~]# kubectl scale deployment nginx-deployment --replicas 3
deployment.apps/nginx-deployment scaled
[root@master01 ~]# kubectl get pod
NAME                                READY   STATUS    RESTARTS   AGE
nginx-deployment-66b9f7ff85-hhv97   1/1     Running   0          92s
nginx-deployment-66b9f7ff85-j8h22   1/1     Running   0          92s
nginx-deployment-66b9f7ff85-k7fwn   1/1     Running   0          92s

[root@master01 ~]# kubectl scale deployment nginx-deployment --replicas 10
[root@master01 ~]# kubectl get pod
NAME                                READY   STATUS    RESTARTS   AGE
nginx-deployment-66b9f7ff85-6jh8k   1/1     Running   0          3s
nginx-deployment-66b9f7ff85-9dzfj   1/1     Running   0          3s
nginx-deployment-66b9f7ff85-ght2r   1/1     Running   0          3s
nginx-deployment-66b9f7ff85-hhv97   1/1     Running   0          115s
nginx-deployment-66b9f7ff85-j8h22   1/1     Running   0          115s
nginx-deployment-66b9f7ff85-k7fwn   1/1     Running   0          115s
nginx-deployment-66b9f7ff85-kp969   1/1     Running   0          3s
nginx-deployment-66b9f7ff85-w7f8t   1/1     Running   0          3s
nginx-deployment-66b9f7ff85-zhkjn   1/1     Running   0          3s
nginx-deployment-66b9f7ff85-zjmlg   1/1     Running   0          3s

二、探针使用

1、readinessProbe

（1）Exec探针

[root@master01 ~]# cat read-pod.yaml
apiVersion: v1
kind: Pod
metadata:
  name: readiness
  labels:
     test: readiness
spec:
  containers:
  - name: readiness
    image: busybox:latest
    command:
    - "/bin/sh"
    - "-c"
    - "touch /tmp/healthy;sleep 30; rm -rf /tmp/healthy;sleep 100000000000"
    readinessProbe:
      exec:
        command:
        - cat
        - /tmp/healthy
      initialDelaySeconds: 10
      periodSeconds: 5

[root@master01 ~]# kubectl apply -f read-pod.yaml
[root@master01 ~]# kubectl get pod -w
[root@master01 ~]# kubectl describe pod readiness

在这里插入图片描述

（2）httpGet和Socket探针

[root@master01 ~]# cat nginx-deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  annotations:
    kubernetes.io/change-cause: "Image update to latest"
  labels:
    app: nginx
spec:
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
  minReadySeconds: 10
  progressDeadlineSeconds: 600
  replicas: 10
  selector:
    matchLabels:
      app: nginx
  revisionHistoryLimit: 20
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
        readinessProbe:
          #httpGet:
          #  path: /
          #  port: 80
          #periodSeconds: 1
          tcpSocket:
            port: 80
          initialDelaySeconds: 15
          periodSeconds: 20


[root@master01 ~]# kubectl apply -f nginx-deploy.yaml
[root@master01 ~]# kubectl describe deployment nginx-deployment

2、Liveness探针

（1）Exec

[root@master01 ~]# cat live-pod.yaml
apiVersion: v1
kind: Pod
metadata:
  name: liveness
  labels:
     test: liveness
spec:
  containers:
  - name: liveness
    image: busybox:latest
    command:
    - "/bin/sh"
    - "-c"
    - "touch /tmp/healthy;sleep 30; rm -rf /tmp/healthy;sleep 100000000000"
    livenessProbe:
      exec:
        command:
        - cat
        - /tmp/healthy
      initialDelaySeconds: 10
      periodSeconds: 5

[root@master01 ~]# kubectl apply -f live-pod.yaml
[root@master01 ~]# kubectl get pod -w

在这里插入图片描述
（2）httpGet探针

[root@master01 ~]# cat nginx-deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  annotations:
    kubernetes.io/change-cause: "Image update to latest"
  labels:
    app: nginx
spec:
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
  minReadySeconds: 10
  progressDeadlineSeconds: 600
  replicas: 10
  selector:
    matchLabels:
      app: nginx
  revisionHistoryLimit: 20
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        imagePullPolicy: IfNotPresent
        ports:
        - name: liveneess-port
          containerPort: 80
        readinessProbe:
          #httpGet:
          #  path: /
          #  port: 80
          #periodSeconds: 1
          tcpSocket:
            port: 80
          initialDelaySeconds: 15
          periodSeconds: 20

        livenessProbe:
          httpGet:
            path: /
            port: liveneess-port

[root@master01 ~]# kubectl apply -f nginx-deploy.yaml
[root@master01 ~]# kubectl describe deployment nginx-deployment

在这里插入图片描述

3、startupProbe

（1）httpGet

[root@master01 ~]# cat nginx-deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  annotations:
    kubernetes.io/change-cause: "Image update to latest"
  labels:
    app: nginx
spec:
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
  minReadySeconds: 10
  progressDeadlineSeconds: 600
  replicas: 10
  selector:
    matchLabels:
      app: nginx
  revisionHistoryLimit: 20
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        imagePullPolicy: IfNotPresent
        ports:
        - name: liveneess-port
          containerPort: 80
        readinessProbe:
          #httpGet:
          #  path: /
          #  port: 80
          #periodSeconds: 1
          tcpSocket:
            port: 80
          initialDelaySeconds: 15
          periodSeconds: 20

        livenessProbe:
          httpGet:
            path: /
            port: liveneess-port
        startupProbe:
          httpGet:
            path: /
            port: liveneess-port
          failureThreshold: 30
          periodSeconds: 20

[root@master01 ~]# kubectl apply -f nginx-deploy.yaml
[root@master01 ~]# kubectl describe deployment nginx-deployment

在这里插入图片描述
（2）滚动更新

[root@master01 ~]# cat app.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: app
spec:
  minReadySeconds: 10
  selector:
    matchLabels:
      run: app
  replicas: 10
  template:
    metadata:
      labels:
        run: app
    spec:
      containers:
      - name: app
        image: busybox:latest
        args:
        - /bin/sh
        - -c
        - sleep 10; touch /tmp/healthy;sleep 100000000000
        readinessProbe:
          exec:
            command:
            - cat
            - /tmp/healthy
          initialDelaySeconds: 10
          periodSeconds: 5

[root@master01 ~]# cat app_v2.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: app
spec:
  minReadySeconds: 10
  selector:
    matchLabels:
      run: app
  replicas: 10
  template:
    metadata:
      labels:
        run: app
    spec:
      containers:
      - name: app
        image: busybox:latest
        args:
        - /bin/sh
        - -c
        - sleep 100000000000
        readinessProbe:
          exec:
            command:
            - cat
            - /tmp/healthy
          initialDelaySeconds: 10
          periodSeconds: 5

[root@master01 ~]# kubectl apply -f app.yaml
[root@master01 ~]# kubectl apply -f app_v2.yaml
[root@master01 ~]# kubectl get pod
NAME                   READY   STATUS        RESTARTS   AGE
app-6fb66c48fc-58dpt   1/1     Running       0          2m18s
app-6fb66c48fc-5sx5w   1/1     Running       0          2m18s
app-6fb66c48fc-75dtw   1/1     Running       0          2m18s
app-6fb66c48fc-79nhq   1/1     Running       0          2m18s
app-6fb66c48fc-8v9hs   1/1     Terminating   0          2m18s
app-6fb66c48fc-cgxj6   1/1     Running       0          2m18s
app-6fb66c48fc-cztkt   1/1     Running       0          2m18s
app-6fb66c48fc-f4npw   1/1     Terminating   0          2m18s
app-6fb66c48fc-g5vsv   1/1     Running       0          2m18s
app-6fb66c48fc-wjq5b   1/1     Running       0          2m18s
app-d7855499b-8lv5l    0/1     Running       0          23s
app-d7855499b-chgg9    0/1     Running       0          23s
app-d7855499b-ph7jw    0/1     Running       0          22s
app-d7855499b-q8xd7    0/1     Running       0          22s
app-d7855499b-qmqc6    0/1     Running       0          23s
[root@master01 ~]# kubectl rollout status deployment app
Waiting for deployment "app" rollout to finish: 5 out of 10 new replicas have been updated...

[root@master01 ~]# kubectl delete -f app_v2.yaml

三、DaemonSet

1、部署cAdvisor-RollingUpdate

如果不是每个节点都安装，那么需要加tolerations
通过set image就可以进行更新

[root@master01 ~]# cat cadvisor.yaml
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: cadvisor
  labels:
    k8s-app: cadvisor
spec:
  selector:
    matchLabels:
      name: cadvisor
  updateStrategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1
  template:
    metadata:
      labels:
        name: cadvisor
    spec:
      hostNetwork: true
      containers:
      - name: cadvisor
        image: google/cadvisor:latest
        ports:
        - containerPort: 8080
        volumeMounts:
        - name: rootfs
          mountPath: /rootfs
          readOnly: true
        - name: sys
          mountPath: /sys
          readOnly: true
        - name: containerd
          mountPath: /var/lib/containerd
          readOnly: true
        - name: disk
          mountPath: /dev/disk
          readOnly: true
      volumes:
        - name: rootfs
          hostPath:
            path: /
        - name: sys
          hostPath:
            path: /sys
        - name: containerd
          hostPath:
            path: /var/lib/containerd
        - name: disk
          hostPath:
            path: /dev/disk

[root@master01 ~]# kubectl apply -f cadvisor.yaml
[root@master01 ~]# kubectl get pod -owide
NAME             READY   STATUS    RESTARTS   AGE   IP            NODE       NOMINATED NODE   READINESS GATES
cadvisor-5mfxm   1/1     Running   0          44s   10.10.10.23   master03   <none>           <none>
cadvisor-d6mj9   1/1     Running   0          44s   10.10.10.21   master01   <none>           <none>
cadvisor-hl4nx   1/1     Running   0          44s   10.10.10.24   node01     <none>           <none>
cadvisor-w6lm4   1/1     Running   0          44s   10.10.10.22   master02   <none>           <none>
cadvisor-wcf4d   1/1     Running   0          44s   10.10.10.25   node02     <none>           <none>

[root@master01 ~]# kubectl rollout history daemonset cadvisor      #查看更新记录

2、部署cAdvisor-OnDelete

手动更新，自己去删除更新

[root@master01 ~]# cat cadvisor.yaml
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: cadvisor
  labels:
    k8s-app: cadvisor
spec:
  selector:
    matchLabels:
      name: cadvisor
  updateStrategy:
    type: OnDelete
  template:
    metadata:
      labels:
        name: cadvisor
    spec:
      hostNetwork: true
      containers:
      - name: cadvisor
        image: google/cadvisor:latest
        ports:
        - containerPort: 8080
        volumeMounts:
        - name: rootfs
          mountPath: /rootfs
          readOnly: true
        - name: sys
          mountPath: /sys
          readOnly: true
        - name: containerd
          mountPath: /var/lib/containerd
          readOnly: true
        - name: disk
          mountPath: /dev/disk
          readOnly: true
      volumes:
        - name: rootfs
          hostPath:
            path: /
        - name: sys
          hostPath:
            path: /sys
        - name: containerd
          hostPath:
            path: /var/lib/containerd
        - name: disk
          hostPath:
            path: /dev/disk

[root@master01 ~]# kubectl apply -f cadvisor.yaml
[root@master01 ~]# kubectl delete -f cadvisor.yaml

四、Job与CronJob

1、Job初体验

restartPolicy: alway、Never、OnFailure
Never：如果发生错误会一直新建pod，会把资源耗尽，可通过backoffLimit：限制最多几次 activeDeadlineSeconds：多少秒就删除 ttlSecondsAfterFinished：清理失败或者成功job时间

[root@master01 ~]# cat myjob.yaml
apiVersion: batch/v1
kind: Job
metadata:
  name: myjob
spec:
  backoffLimit: 3
  activeDeadlineSeconds: 10
  ttlSecondsAfterFinished: 30
  template:
    spec:
      containers:
      - name: myjob
        image: busybox
        command: ["echo","hello world!"]
      restartPolicy: Never
[root@master01 ~]# cat myjob.yaml
apiVersion: batch/v1
kind: Job
metadata:
  name: myjob
spec:
  backoffLimit: 3
  activeDeadlineSeconds: 10
  ttlSecondsAfterFinished: 30
  template:
    spec:
      containers:
      - name: myjob
        image: busybox
        command: ["echo","hello world!"]
      restartPolicy: Never

[root@master01 ~]# kubectl apply -f myjob.yaml
[root@master01 ~]# kubectl get pod
NAME          READY   STATUS      RESTARTS   AGE
myjob-cqmxf   0/1     Completed   0          19s

[root@master01 ~]# kubectl get jobs myjob
NAME    COMPLETIONS   DURATION   AGE
myjob   1/1           5s         2m1s

[root@master01 ~]# kubectl logs myjob-cqmxf
hello world!

[root@master01 ~]# kubectl delete -f myjob.yaml

在这里插入图片描述
（2）同时运行2个

completions：执行总量

[root@master01 ~]# cat myjob.yaml
apiVersion: batch/v1
kind: Job
metadata:
  name: myjob
spec:
  parallelism: 2
  completions: 10
  completionMode: Indexed
  backoffLimit: 3
  activeDeadlineSeconds: 120
  ttlSecondsAfterFinished: 1200
  template:
    spec:
      containers:
      - name: myjob
        image: busybox
        command: ["echo","hello world!"]
      restartPolicy: Never

[root@master01 ~]# kubectl apply -f myjob.yaml

2、CronJob初体验

设置时区：timeZone: Etc/UTC

[root@master01 ~]# cat cronjob.yaml
apiVersion: batch/v1
kind: CronJob
metadata:
  name: hello
spec:
  schedule: "*/1 * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: hello
            image: busybox
            command: ["echo","hello world!"]
          restartPolicy: OnFailure
          
[root@master01 ~]# kubectl apply -f cronjob.yaml

3、CronJob设置参数

  successfulJobsHistoryLimit: 3    #记录成功次数3
  failedJobsHistoryLimit: 3        #记录失败次数3
  startingDeadlineSeconds: 200     #最晚执行时间
  concurrencyPolicy: Allow         #允许叠加，Forbid忽略旧任务 Replace忽略新任务

[root@master01 ~]# cat cronjob.yaml
apiVersion: batch/v1
kind: CronJob
metadata:
  name: hello
spec:
  successfulJobsHistoryLimit: 3
  failedJobsHistoryLimit: 3
  startingDeadlineSeconds: 200
  concurrencyPolicy: Allow
  schedule: "*/1 * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: hello
            image: busybox
            command: ["echo","hello world!"]
          restartPolicy: OnFailure

[root@master01 ~]# kubectl apply -f cronjob.yaml