CKA 예제 리마인더 - 10. DaemonSets

실행되고 있는 DaemonSets 갯수를 찾으세요

나의 답안 )

kubectl get daemonset -A --no-headers | wc -l

Solution )

나의 답안과 같음



다른 네임스페이스에 있는 특정 DaemonSet가 생성한 파드가 몇 개 인지 찾으세요

나의 답안 )

kubectl describe daemonset <DaemonSet> -n=<namespace>

Solution )

kubectl describe daemonset <DaemonSet> -n=<namespace>

도 가능하지만 사실

kubectl get daemonset <DaemonSet> 만으로 파드의 desire 값, current, ready등등 지표가 출력된다


DaemonSet을 생성하세요

Name: elasticsearch

Namespace: kube-system

Image: registry.k8s.io/fluentd-elasticsearch:1.20


나의 답안 )
쿠버네티스 공식 페이지의 DaemonSet Manifest 활용

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: elasticsearch
  namespace: kube-system
  labels:
    k8s-app: fluentd-logging
spec:
  selector:
    matchLabels:
      name: fluentd-elasticsearch
  template:
    metadata:
      labels:
        name: fluentd-elasticsearch
    spec:
      tolerations:
      # these tolerations are to have the daemonset runnable on control plane nodes
      # remove them if your control plane nodes should not run pods
      - 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: registry.k8s.io/fluentd-elasticsearch:1.20
        resources:
          limits:
            memory: 200Mi
          requests:
            cpu: 100m
            memory: 200Mi
        volumeMounts:
        - name: varlog
          mountPath: /var/log
      # it may be desirable to set a high priority class to ensure that a DaemonSet Pod
      # preempts running Pods
      # priorityClassName: important
      terminationGracePeriodSeconds: 30
      volumes:
      - name: varlog
        hostPath:
          path: /var/log


kubectl apply -f elastic.yaml


Solution )

deploy와 manifest 형식이 비슷하기 때문에

kubectl create deployment elasticsearch -n kube-system --image=registry.k8s.io/fluentd-elasticsearch:1.20 --dry-run=client -o yaml > ./elasticsearch.yaml

manifest 수정 진행

apiVersion은 deploy, daemonset 모두 apps/v1으로 동일, kind를 Deployment에서 DaemonSet으로 변경