导语：希望通过daemonset执行某个命令来清理磁盘。记录一下测试过程

Dockerfile

# 1
FROM centos:7
RUN yum -y install crontabs
USER root
WORKDIR /beta/logs/
RUN echo "Asia/Shanghai" > /etc/timezone
CMD ["/usr/sbin/crond","-n"]  # -i 后台运行

docker build -t harbor.betawm.com/tools/clearlog:v7 -f 1 .

1.yaml

apiVersion: v1
data:
  ClearLog.sh: |-
    #!/bin/bash
    webhook='https://oapi.dingtalk.com/robot/send?access_token=84031e85e408a7a8cf9e7dec957c43eb7b13907325ba51aff2e9643324591520'

    Date=$(date "+%Y-%m-%d_%H%S%M")
    Date1=$(date "+%Y-%m-%d_%H%M%S")
    Dir='/tmp/'


    ip=$HOST_IP  #pod里边定义
    du -sh /beta/logs/ | awk '{print $1}' > $Dir$Date
    #删除三天以前的日志文件
    find /beta/logs/ -name '*.log' -type f  -mtime +3 -print -exec ls -l {} \;
    #删除三天以前的空目录
    find /beta/logs/ -maxdepth 2 -type d   -empty -print -exec ls -l {} \;

    Date1=$(date "+%Y-%m-%d_%H%M%S")
    du -sh /beta/logs/ | awk '{print $1}' > $Dir$Date1


    curl $webhook -H 'Content-Type: application/json' -d "
    {
        'msgtype': 'text',
        'text': {
            'content': '[比心][比心]生产环境k8s空间清理[比心][比心]
            \n ++++++[对勾]${HOST_IP}清理前空间[对勾]+++++++
            /beta/logs: `cat  $Dir$Date`
            \n++++++[对勾]${HOST_IP}清理后空间[对勾]+++++++
            /beta/logs: `cat  $Dir$Date1`\n'
            },
        'at': {
            'isAtAll': true
        }
    }"
kind: ConfigMap
metadata:
  name: clearlogconf
  namespace: default

---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  annotations:
    deprecated.daemonset.template.generation: '13'
  labels:
    app: clearlog
  name: clearlog
  namespace: default
  resourceVersion: '10612247'
spec:
  minReadySeconds: 60
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: clearlog
  template:
    metadata:
      annotations:
        kubectl.kubernetes.io/restartedAt: '2021-09-29T18:14:54+08:00'
      creationTimestamp: null
      labels:
        app: clearlog
    spec:
      containers:
        - env:
            - name: HOST_IP #赋值给指定变量，在pod中调用此环境变量返回的就是当前物理机的IP地址。
              valueFrom:
                fieldRef:
                  apiVersion: v1
                  fieldPath: status.hostIP #获取当前节点的物理地址
          image: 'harbor.betawm.com/tools/clearlog:v7'
          imagePullPolicy: IfNotPresent
          lifecycle:
            postStart:
              exec:
                command:
                  - /bin/bash
                  - '-c'
                  - ' echo "* * * * * /bin/bash /tmp/ClearLog.sh >> /tmp/tmp.txt" >> conf && crontab conf && rm -f conf '
          name: clear-client
          resources:
            limits:
              cpu: 500m
              memory: 2Gi
            requests:
              cpu: 200m
              memory: 500Mi
          terminationMessagePath: /dev/termination-log
          terminationMessagePolicy: File
          volumeMounts:
            - mountPath: /beta/logs
              name: hostlog
            - mountPath: /tmp/ClearLog.sh
              name: clear-log-config
              subPath: ClearLog.sh
      dnsConfig: {}
      dnsPolicy: ClusterFirst
      hostNetwork: true
      imagePullSecrets:
        - name: betasecret
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext:
        seLinuxOptions: {}
      terminationGracePeriodSeconds: 30
      volumes:
        - hostPath:
            path: /beta/logs
            type: Directory
          name: hostlog
        - configMap:
            defaultMode: 420
            name: clearlogconf
          name: clear-log-config
  updateStrategy:
    rollingUpdate:
      maxUnavailable: 1
    type: RollingUpdate

https://www.cnblogs.com/nf01/articles/15353573.html

Dockerfile

# 2
FROM docker:dind
COPY cleaner.sh /bin/
RUN chmod +x /bin/cleaner.sh
#CMD ["bash", "/bin/cleaner.sh"]

docker build . -t cleaner:v1 -f 2

docker-cleanup.yaml

# 定时任务的执行时间调整一下
apiVersion: batch/v1beta1
kind: CronJob
metadata:
  name:  docker-cleanup
spec:
  jobTemplate:
    spec:
      completions: 1
      template:
        spec:
          restartPolicy: Never
          volumes:
            - name: local-time
              hostPath:
                path: /etc/localtime
            - hostPath:
                path: /var/run/docker.sock
                type: Socket
              name: dockersocks
          containers:
            - name: mysqlcleanup-container
              image: cleaner:v1
              volumeMounts:
                - name: local-time
                  mountPath: /etc/localtime
                - mountPath: /var/run/docker.sock
                  name: dockersocks
              command: ["sh","-c","/bin/cleaner.sh"]
  schedule: "*/5 * * * *"

https://openkruise.io/zh/docs/best-practices/acronjob+broadcastjob/