创建 DaemonSet

daemonset.yaml

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: fluentd-elasticsearch
  namespace: kube-system
  labels:
    k8s-app: fluentd-logging
spec:
  selector:
    matchLabels:
      name: fluentd-elasticsearch
  template:
    metadata:
      labels:
        name: fluentd-elasticsearch
    spec:
      tolerations:
      # 这些容忍度设置是为了让该守护进程集在控制平面节点上运行
      # 如果你不希望自己的控制平面节点运行 Pod，可以删除它们
      - key: node-role.kubernetes.io/control-plane
        operator: Exists
        effect: NoSchedule
      - key: node-role.kubernetes.io/master
        operator: Exists
        effect: NoSchedule
      containers:
      - name: fluentd-elasticsearch
        image: quay.io/fluentd_elasticsearch/fluentd:v2.5.2
        resources:
          limits:
            memory: 200Mi
          requests:
            cpu: 100m
            memory: 200Mi
        volumeMounts:
        - name: varlog
          mountPath: /var/log
      # 可能需要设置较高的优先级类以确保 DaemonSet Pod 可以抢占正在运行的 Pod
      # priorityClassName: important
      terminationGracePeriodSeconds: 30
      volumes:
      - name: varlog
        hostPath:
          path: /var/log

创建DaemonSet

使用 kubectl create 命令创建该 DaemonSet：

$ kubectl create -f daemonset.yaml 
daemonset.apps/fluentd-elasticsearch created

查看相关信息

$ kubectl get ds -n kube-system -l k8s-app=fluentd-logging
NAME                    DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR   AGE
fluentd-elasticsearch   5         5         5       5            5           <none>          12m

$ kubectl get pod -n kube-system -l name=fluentd-elasticsearch -o wide
NAME                          READY   STATUS    RESTARTS   AGE   IP               NODE           NOMINATED NODE   READINESS GATES
fluentd-elasticsearch-j8hq8   1/1     Running   0          17m   172.18.195.1     k8s-master03   <none>           <none>
fluentd-elasticsearch-psfkr   1/1     Running   0          17m   172.25.92.71     k8s-master02   <none>           <none>
fluentd-elasticsearch-r6v22   1/1     Running   0          17m   172.17.125.46    k8s-node01     <none>           <none>
fluentd-elasticsearch-swp4z   1/1     Running   0          17m   172.25.244.193   k8s-master01   <none>           <none>
fluentd-elasticsearch-tftmd   1/1     Running   0          17m   172.27.14.240    k8s-node02     <none>           <none>