DaemonSet:確保所有節點都運行指定的Pod。隨著節點被加入到叢集中，Pod會自動被添加到新的節點。當從叢群刪除節點時，在節點上的Pod也會被刪除。刪除DaemonSet將清除它創建的Pod。
Daemonset.yaml

apiVersion: apps/v1
kind: DaemonSet
metadata:
  labels:
    app: ubuntu
  name: daemonset-demo
spec:
  selector:
    matchLabels:
      app: ubuntu
  template:
    metadata:
      labels:
        app: ubuntu
    spec:
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule
      containers:
      - name: ubuntu
        image: ubuntu:20.04
        args: [bash, -c, 'for ((i = 0; ; i++)); do echo "$i: $(date)"; sleep 100; done']

部屬Daemonset

root@master:/# kubectl apply -f daemonset.yaml 
daemonset.apps/daemonset-demo created

查看Daemonset

root@master:/# kubectl get daemonset
NAME             DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR   AGE
daemonset-demo   2         2         1       2            1           <none>          3s

查看pod

root@c8master:/# kubectl get pod -o wide
NAME                              READY   STATUS    RESTARTS   AGE    IP             NODE             NOMINATED NODE   READINESS GATES
daemonset-demo-9jcfr              1/1     Running   0          24s    10.244.1.150   node     <none>           <none>
daemonset-demo-djwmg              1/1     Running   0          24s    10.244.0.69    master         <none>           <none>

自我修復

先刪除daemonset-demo-9jcfr，再查看pod

root@master:/# kubectl delete pod daemonset-demo-9jcfr
pod "daemonset-demo-9jcfr" deleted

kubectl get pod -o wide
NAME                              READY   STATUS    RESTARTS   AGE     IP             NODE             NOMINATED NODE   READINESS GATES
daemonset-demo-48gj9              1/1     Running   0          8s      10.244.1.151   node   <none>           <none>
daemonset-demo-djwmg              1/1     Running   0          4m42s   10.244.0.69    master         <none>           <none>