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  • Kuberbetes的DaemonSet

    DaemonSet确保全部(或者一些)Node上运行一个Pod的副本。当有Node加入集群时,也会为他们新增一个Pod,当有Node从集群移除时,这些Pod也会被回收,删除DaemonSet将会删除他创建的所有Pod

    使用daemonSet的一些典型用法:

    • 运行集群存储Daemon,例如在每个Node上运行glusterd、ceph
    • 在每个Node上运行日志收集daemon,例如fluentd、logstash
    • 在每个Node上运行监控daemon,例如Prometheus Node Exporter、collectd、datadog代理、new relic代理或者Ganglia gmond
    apiVersion: apps/v1
    kind: DaemonSet
    metadata:
      name: ds-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

    执行并查看日志

    [root@test yaml]# kubectl apply -f ds.yaml 
    daemonset.apps/ds-test created
    [root@test yaml]# kubectl get pods
    NAME                   READY   STATUS    RESTARTS   AGE
    ds-test-gs6z5          1/1     Running   0          10s
    ds-test-xfjgt          1/1     Running   0          10s
    web-586db47859-6vpfr   1/1     Running   0          23h
    web-586db47859-8hmxs   1/1     Running   0          23h
    web-586db47859-wspl7   1/1     Running   0          23h
    [root@test yaml]# kubectl exec -it ds-test-gs6z5 bash
    kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
    root@ds-test-gs6z5:/# ls
    bin  boot  dev    docker-entrypoint.d  docker-entrypoint.sh  etc    home  lib  lib64  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var
    root@ds-test-gs6z5:/# ls tmp/log/
    audit           btmp-20201201  cron-20201206       kube-apiserver    maillog-20201206   ntpstats  secure-20201115   spooler-20201129  zabbix
    boot.log       chrony      dmesg              kubernetes    messages       pods      secure-20201122   spooler-20201206
    boot.log-20200821  containers      dmesg.old          lastlog        messages-20201115  qemu-ga   secure-20201129   tallylog
    boot.log-20200825  cron          elasticsearch       maillog        messages-20201122  redis     secure-20201206   tuned
    boot.log-20200915  cron-20201115  firewalld          maillog-20201115    messages-20201129  rhsm      spooler           wtmp
    boot.log-20201107  cron-20201122  grubby          maillog-20201122    messages-20201206  sa         spooler-20201115  yum.log
    btmp           cron-20201129  grubby_prune_debug  maillog-20201129    mongodb           secure    spooler-20201122  yum.log-20201120
    root@ds-test-gs6z5:/# exit
    exit
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  • 原文地址:https://www.cnblogs.com/fat-girl-spring/p/14120252.html
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