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15-Practice-Test-DaemonSets.md

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Practice Test - DaemonSets

Solutions to practice test daemonsets

  • Run the command kubectl get daemonsets --all-namespaces

    $ kubectl get daemonsets --all-namespaces
    
  • Run the command kubectl get daemonsets --all-namespaces

    $ kubectl get daemonsets --all-namespaces
    
  • Run the command kubectl get all --all-namespaces and identify the types

    $ kubectl get all --all-namespaces
    
  • Run the command kubectl describe daemonset kube-proxy --namespace=kube-system

    $ kubectl describe daemonset kube-proxy --namespace=kube-system
    
  • Run the command kubectl describe daemonset kube-flannel-ds-amd64 --namespace=kube-system

    $ kubectl describe daemonset kube-flannel-ds-amd64 --namespace=kube-system
    
  • Create a daemonset

vi ds.yaml

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: elasticsearch
  namespace: kube-system
  labels:
    k8s-app: fluentd-logging
spec:
  selector:
    matchLabels:
      name: elasticsearch
  template:
    metadata:
      labels:
        name: elasticsearch
    spec:
      tolerations:
      # this toleration is to have the daemonset runnable on master nodes
      # remove it if your masters can't run pods
      - key: node-role.kubernetes.io/master
        effect: NoSchedule
      containers:
      - name: elasticsearch
        image: k8s.gcr.io/fluentd-elasticsearch:1.20

To create the daemonset and list the daemonsets and pods

$ kubectl create -f ds.yaml
$ kubectl get ds -n kube-system
$ kubectl get pod -n kube-system|grep elasticsearch