Exercise 4.5: Setting Pod Resource Limits and Requirements

1. Deployment 생성

   cat <<EOF | kubectl apply -f -
   apiVersion: apps/v1
   kind: Deployment
   metadata:
     labels:
       app: stressmeout
     name: stressmeout
   spec:
     selector:
       matchLabels:
         app: stressmeout
     template:
       metadata:
         labels:
           app: stressmeout
       spec:
         containers:
         - image: vish/stress
           name: stressmeout
           args:
           - -cpus
           - "2"
           - -mem-total
           - "1950Mi"
           - -mem-alloc-size
           - "100Mi"
           - -mem-alloc-sleep
           - "1s"
   EOF

2. Pod가 배포된 노드 확인

   kubectl get pod -l app=stressmeout -o wide

3. Pod가 배포된 노드에서 top 명령어를 실행해서 리소스 사용량 확인

4. Deployment 수정

   cat <<EOF | kubectl apply -f -
   apiVersion: apps/v1
   kind: Deployment
   metadata:
     labels:
       app: stressmeout
     name: stressmeout
   spec:
     selector:
       matchLabels:
         app: stressmeout
     template:
       metadata:
         labels:
           app: stressmeout
       spec:
         containers:
         - image: vish/stress
           name: stressmeout
           resources:
             requests:
               cpu: "0.5"
               memory: "500Mi"
             limits:
               cpu: "1"
               memory: "1Gi"
           args:
           - -cpus
           - "2"
           - -mem-total
           - "1950Mi"
           - -mem-alloc-size
           - "100Mi"
           - -mem-alloc-sleep
           - "1s"
   EOF

5. Pod 상태 추적

   kubectl get pod -l app=stressmeout -w

6. Ctrl+C 입력

7. Pod의 상세 내용 확인

   kubectl describe pod -l app=stressmeout

8. 노드에 부여된 Label 확인

   kubectl get node --show-labels

9. Deployment 수정

   cat <<EOF | kubectl apply -f -
   apiVersion: apps/v1
   kind: Deployment
   metadata:
     labels:
       app: stressmeout
     name: stressmeout
   spec:
     selector:
       matchLabels:
         app: stressmeout
     template:
       metadata:
         labels:
           app: stressmeout
       spec:
         nodeSelector:
           kubernetes.io/hostname: worker
         containers:
         - image: vish/stress
           name: stressmeout
           resources:
             requests:
               cpu: "0.5"
               memory: "500Mi"
             limits:
               cpu: "2"
               memory: "2Gi"
           args:
           - -cpus
           - "2"
           - -mem-total
           - "1950Mi"
           - -mem-alloc-size
           - "100Mi"
           - -mem-alloc-sleep
           - "1s"
   EOF

10. Pod 상태 추적

    kubectl get pod -l app=stressmeout -w

11. Ctrl+C 입력

12. Deployment 수정

    cat <<EOF | kubectl apply -f -
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      labels:
        app: stressmeout
      name: stressmeout
    spec:
      selector:
        matchLabels:
          app: stressmeout
      template:
        metadata:
          labels:
            app: stressmeout
        spec:
          nodeSelector:
            kubernetes.io/hostname: worker
          containers:
          - image: vish/stress
            name: stressmeout
            resources:
              requests:
                cpu: "2"
                memory: "8Gi"
              limits:
                cpu: "2"
                memory: "8Gi"
            args:
            - -cpus
            - "2"
            - -mem-total
            - "1950Mi"
            - -mem-alloc-size
            - "100Mi"
            - -mem-alloc-sleep
            - "1s"
    EOF

13. Pod 상태 확인

    kubectl get pod -l app=stressmeout

14. Pod의 상세 내용 확인

    kubectl describe pod -l app=stressmeout

15. 노드에 가용한 리소스 확인

    kubectl describe node worker

16. Deployment 삭제

    kubectl delete deploy stressmeout