Exercise 4.3: Resource Limits for a Namespace

1. Namespace 생성

   kubectl create ns dev

2. Namespace 생성 확인

   kubectl get ns dev

3. LimitRange 생성

   cat <<EOF | kubectl -n dev create -f -
   apiVersion: v1
   kind: LimitRange
   metadata:
     name: default-resource-range
   spec:
     limits:
     - default:
         cpu: 1
         memory: 500Mi
       defaultRequest:
         cpu: 0.5
         memory: 100Mi
       type: Container
   EOF

4. LimitRange 생성 확인

   kubectl get limitranges -n dev

5. Deployment 생성

   kubectl create deployment nginx --image=nginx -n dev

6. Deployment 생성 확인

   kubectl get deploy,pod -l app=nginx -n dev

7. Pod에 할당된 리소스 확인

   kubectl -n low-usage-limit get pod POD_NAME -o yaml \
   | grep -A 6 -B 5 resources

   OR

   kubectl -n dev get pod \
   $(kubectl get pod -l app=nginx -o=jsonpath='{.items[0].metadata.name}' -A) -o yaml \
   | grep -A 6 -B 5 resources

8. 리소스 할당을 명시한 Deployment 생성

   cat <<EOF | kubectl -n dev create -f -
   apiVersion: apps/v1
   kind: Deployment
   metadata:
     labels:
       app: apache
     name: apache
   spec:
     replicas: 1
     selector:
       matchLabels:
         app: apache
     template:
       metadata:
         labels:
           app: apache
       spec:
         containers:
         - image: httpd
           name: apache
           resources:
             limits:
               cpu: "1"
               memory: "4Gi"
             requests:
               cpu: "0.5"
               memory: "500Mi"
   EOF

9. Deployment 생성 확인

   kubectl get deploy,pod -l app=apache -n dev

10. Pod에 할당된 리소스 확인

    kubectl -n low-usage-limit get pod POD_NAME -o yaml \
    | grep -A 6 -B 5 resources

    OR

    kubectl -n dev get pod \
    $(kubectl get pod -l app=apache -o=jsonpath='{.items[0].metadata.name}' -A) -o yaml \
    | grep -A 6 -B 5 resources

11. 리소스 삭제

    {
        kubectl delete deployment --all -n dev
        kubectl delete ns dev
    }