중간점검 실습 과제

과제

1. ~/kube/example 이라는 폴더를 만들어 해당 폴더에서 다음 작업을 수행한다

   [root@master ~/kube]# mkdir ~/kube/example && cd ~/kube/example/

2. 다음 조건에 맞게 Deployment 컨트롤러를 사용하는 lab_deploy.yaml 파일을 생성하고 동작시킨다

   • pod : 3개
   • labels: rel:stable
   • deploy name : lab-deploy
   • container name : apache-web
   • container image : httpd:2.2

   [root@master ~/kube/08]# mkdir -p ~/kube/example && cd ~/kube/example
   [root@master ~/kube/example]# kubectl api-resources | grep deploy
   deployments                       deploy       apps/v1                                true         Deployment
   [root@master ~/kube/example]# vi lab_deploy.yaml
   [root@master ~/kube/example]# cat lab_deploy.yaml
   apiVersion: apps/v1
   kind: Deployment
   metadata:
     name: lab-deploy
   spec:
     replicas: 3
     selector:
       matchLabels:
         rel: stable
     template:
       metadata:
         name: lab-pod
         labels:
           rel: stable
       spec:
         containers:
         - name: apache-web
           image: httpd:2.2
   [root@master ~/kube/example]# kubectl apply -f lab_deploy.yaml
   deployment.apps/lab-deploy created
   [root@master ~/kube/example]# kubectl get pod
   NAME                          READY   STATUS              RESTARTS   AGE
   lab-deploy-5b6d66bbbd-2pphz   0/1     ContainerCreating   0          4s
   lab-deploy-5b6d66bbbd-qvb7m   0/1     ContainerCreating   0          4s
   lab-deploy-5b6d66bbbd-wtkkz   0/1     ContainerCreating   0          4s

3. 위의 구성이 완료되었다면, httpd:2.4 버전의 컨테이너를 갖고 있는 파드를 총 6개로 확장하도록 한다.

   • Image version upgrade
   • Scale up 3 to 6

   [root@master ~/kube/example]# kubectl set image deploy lab-deploy apache-web=httpd:2.4
   deployment.apps/lab-deploy image updated
   [root@master ~/kube/example]# kubectl describe pod lab-deploy | grep Image
       Image:          httpd:2.4
       Image ID:       docker-pullable://httpd@sha256:10381816bb7e60ae3a9db3784f2966a8910b6ff07c4da54bd2d62d2671c8ab6e
       Image:          httpd:2.4
       Image ID:       docker-pullable://httpd@sha256:10381816bb7e60ae3a9db3784f2966a8910b6ff07c4da54bd2d62d2671c8ab6e
       Image:          httpd:2.4
       Image ID:       docker-pullable://httpd@sha256:10381816bb7e60ae3a9db3784f2966a8910b6ff07c4da54bd2d62d2671c8ab6e
   [root@master ~/kube/example]# kubectl scale deployment lab-deploy --replicas=6
   deployment.apps/lab-deploy scaled
   [root@master ~/kube/example]# kubectl get pod
   NAME                          READY   STATUS    RESTARTS   AGE
   lab-deploy-86bf6d86fd-8rwh5   1/1     Running   0          3s
   lab-deploy-86bf6d86fd-cb7nz   1/1     Running   0          3s
   lab-deploy-86bf6d86fd-kfzvb   1/1     Running   0          27s
   lab-deploy-86bf6d86fd-lpljr   1/1     Running   0          19s
   lab-deploy-86bf6d86fd-smv9p   1/1     Running   0          23s
   lab-deploy-86bf6d86fd-vgv7s   1/1     Running   0          3s
   [root@master ~/kube/example]# kubectl describe pod lab-deploy | grep Image
       Image:          httpd:2.4
       Image ID:       docker-pullable://httpd@sha256:10381816bb7e60ae3a9db3784f2966a8910b6ff07c4da54bd2d62d2671c8ab6e
       Image:          httpd:2.4
       Image ID:       docker-pullable://httpd@sha256:10381816bb7e60ae3a9db3784f2966a8910b6ff07c4da54bd2d62d2671c8ab6e
       Image:          httpd:2.4
       Image ID:       docker-pullable://httpd@sha256:10381816bb7e60ae3a9db3784f2966a8910b6ff07c4da54bd2d62d2671c8ab6e
       Image:          httpd:2.4
       Image ID:       docker-pullable://httpd@sha256:10381816bb7e60ae3a9db3784f2966a8910b6ff07c4da54bd2d62d2671c8ab6e
       Image:          httpd:2.4
       Image ID:       docker-pullable://httpd@sha256:10381816bb7e60ae3a9db3784f2966a8910b6ff07c4da54bd2d62d2671c8ab6e
       Image:          httpd:2.4
       Image ID:       docker-pullable://httpd@sha256:10381816bb7e60ae3a9db3784f2966a8910b6ff07c4da54bd2d62d2671c8ab6e

4. 실습이 완료되었다면, Deployment 컨트롤러를 삭제한다

   [root@master ~/kube/example]# kubectl delete deployments.apps lab-deploy
   deployment.apps "lab-deploy" deleted
   [root@master ~/kube/example]# kubectl get all
   NAME                 TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
   service/kubernetes   ClusterIP   10.233.0.1   <none>        443/TCP   3h25m