k8s笔记-daemonSet、Job、CronJob

分手后的思念是犯贱 2022-02-27 16:56 433阅读 0赞

官方文档  
[https://kubernetes.io/zh/docs/concepts/workloads/controllers/daemonset/][https_kubernetes.io_zh_docs_concepts_workloads_controllers_daemonset]

## 创建daemonSet文件 ##

确保所有node运行同一个pod，守护进程集。  
确保集群中每个node中运行一份pod副本，当node加入集群时，创建pod，当node离开集群时，回收pod，如果删除daemonset，其创建的所有pod也被删除，daemonset的pod覆盖整个集群。  
**应用场景：集群存储守护进程，集群日志收集守护进程，节点监控守护进程。**

vi ds.yaml
    apiVersion: apps/v1
    kind: DaemonSet
    metadata:
      name: ds-test
      namespace: test
      labels:
        app: filebeat
    spec:
      selector:
        matchLabels:
          app: filebeat
      template:
        metadata:
          labels:
            app: filebeat
        spec:
          containers:
          - name: logs
            image: nginx
            ports:
            - containerPort: 80
            volumeMounts:
            - name: varlog
              mountPath: /tmp/log
          volumes:
          - name: varlog
            hostPath:
              path: /var/log

使用filebeat工具，部署到每一个node上采集宿主机的日志目录。  
可以在创建完成后，查看日志目录

kubectl apply -f ds.yaml
    kubectl get pods -n test

![在这里插入图片描述][20190328103358690.png]  
进入查看日志目录：

kubectl exec -it ds-test-gxh75 -n test bash

![在这里插入图片描述][20190328103512742.png]

## Job 普通任务 ##

一次性执行，适合临时跑一个任务，跑完就停止了。  
**应用场景：离线数据处理，视频解码等业务。**

apiVersion: batch/v1
    kind: Job
    metadata:
      name: pi
      namespace: test
    spec:
      template:
        spec:
          containers:
          - name: pi
            image: perl
            command: ["perl",  "-Mbignum=bpi", "-wle", "print bpi(2000)"]
          restartPolicy: Never
      backoffLimit: 4

![在这里插入图片描述][20190328105704345.png]

# 查看job
    kubectl get jobs -n test

![在这里插入图片描述][20190328105722443.png]

## CronJob 定时任务 ##

**应用场景：通知、备份**

apiVersion: batch/v1beta1
    kind: CronJob
    metadata:
      name: hello
      namespace: test
    spec:
      schedule: "*/1 * * * *"
      jobTemplate:
        spec:
          template:
            spec:
              containers:
              - name: hello
                image: busybox
                args:
                - /bin/sh
                - -c
                - date; echo Hello from the Kubernetes cluster
              restartPolicy: OnFailure

每一分钟处理一次  
![在这里插入图片描述][20190328110437647.png]  
![在这里插入图片描述][20190328110616160.png]

[https_kubernetes.io_zh_docs_concepts_workloads_controllers_daemonset]: https://kubernetes.io/zh/docs/concepts/workloads/controllers/daemonset/
[20190328103358690.png]: /images/20220227/771cd5e91ec044eba2f72fe695e2f338.png
[20190328103512742.png]: /images/20220227/20a8542527014a15a6e53fb6f4796306.png
[20190328105704345.png]: /images/20220227/d4e5899189e843238d4fbaba1d033e04.png
[20190328105722443.png]: /images/20220227/4279efa08a1c4fc9afcb59714ed91b2f.png
[20190328110437647.png]: /images/20220227/71e27a96ebaa4093a2432fff81d67623.png
[20190328110616160.png]: /images/20220227/8583f75f05404bf39652449a8d3ee4ef.png