CKAD対策 Q8&A8

Q8
以下のPodをデプロイし、CPUとメモリーの使用率をliveness-exec_resource.txtに保存してファイルの内容を確認せよ。
　※https://raw.githubusercontent.com/kubernetes/website/main/content/en/examples/pods/probe/exec-liveness.yamlからダウンロード可

apiVersion: v1
kind: Pod
metadata:
  labels:
    test: liveness
  name: liveness-exec
spec:
  containers:
  - name: liveness
    image: registry.k8s.io/busybox
    args:
    - /bin/sh
    - -c
    - touch /tmp/healthy; sleep 30; rm -f /tmp/healthy; sleep 600
    livenessProbe:
      exec:
        command:
        - cat
        - /tmp/healthy
      initialDelaySeconds: 5
      periodSeconds: 5

A8

kubeuser@master01:~$ kubectl apply -f https://raw.githubusercontent.com/kubernetes/website/main/content/en/examples/pods/probe/exec-liveness.yaml
pod/liveness-exec created

kubeuser@master01:~$ kubectl get pods liveness-exec
NAME            READY   STATUS    RESTARTS   AGE
liveness-exec   2/2     Running   0          15s

kubeuser@master01:~$ kubectl top pods liveness-exec
NAME            CPU(cores)   MEMORY(bytes)   
liveness-exec   6m           41Mi            

kubeuser@master01:~$ kubectl top pods liveness-exec > ./liveness-exec_resource.txt

kubeuser@master01:~$ cat liveness-exec_resource.txt 
NAME            CPU(cores)   MEMORY(bytes)   
liveness-exec   5m           41Mi

おまけ：削除

kubeuser@master01:~$ rm livensss-exec-resource.txt 

kubeuser@master01:~$ kubectl delete pods liveness-exec --force
Warning: Immediate deletion does not wait for confirmation that the running resource has been terminated. The resource may continue to run on the cluster indefinitely.
pod "liveness-exec" force deleted

参照本家サイト
Configure Liveness, Readiness and Startup Probes
https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/