k8s部署daemonset代码示例：每个节点都会运行的守护进程

[root@m-1 test]# cat daemonset.yaml 
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:1.14-alpine
        ports:
        - containerPort: 80
        volumeMounts:
        - name: varlog
          mountPath: /tmp/log
      volumes:
      - name: varlog
        hostPath:
          path: /var/log

挂载情况查看：

[root@m-1 test]# ls /var/log
anaconda           boot.log-20201231  cron-20210110       maillog            messages-20210117  secure-20210124   wtmp
audit              boot.log-20210101  cron-20210117       maillog-20210103   messages-20210124  spooler           wtmp-20201009
boot.log           btmp               cron-20210124       maillog-20210110   pods               spooler-20210103  yum.log
boot.log-20200916  btmp-20210101      dmesg               maillog-20210117   rhsm               spooler-20210110  yum.log-20210101
boot.log-20201009  chrony             dmesg.old           maillog-20210124   secure             spooler-20210117
boot.log-20201016  containers         firewalld           messages           secure-20210103    spooler-20210124
boot.log-20201107  cron               grubby_prune_debug  messages-20210103  secure-20210110    tallylog
boot.log-20201207  cron-20210103      lastlog             messages-20210110  secure-20210117    tuned