[CKA] Persistent Volume Claim을 사용하는 Pod 운영

[문제]

Application With Persistent Volume Claim

* Create a new PersistentVolumeClaim:
  Name: app-volume
  StorageClass: az-c
  Capacity: 10Mi
* Create a new Pod which mounts the PersistentVolumeClaim as a volume:
  Name: web-server-pod
  Image: nginx
  Mount path: /usr/share/nginx/html
* Configure the new Pod to have ReadWriteMany access on the volume.

 

[풀이]

아래 docs 링크의 PersistentVolumeClaim 예제 참고

https://kubernetes.io/docs/concepts/storage/persistent-volumes/

문제에 맞게 pvc 구성

# cat app-volume-pvc.yaml 
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: app-volume
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 10Mi
  storageClassName: az-c

# kubectl apply -f app-volume-pvc.yaml 

# kubectl get pv
NAME         CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM                STORAGECLASS   REASON   AGE
app-config   1Gi        RWX            Retain           Bound       default/app-volume   az-c                    2d15h
pv1          5Gi        RWO,ROX        Recycle          Available                        gp2                     57d

# kubectl get pvc
NAME         STATUS   VOLUME       CAPACITY   ACCESS MODES   STORAGECLASS   AGE
app-volume   Bound    app-config   1Gi        RWX            az-c           6s

※ 10Mi로 설정하였지만 pv는 모두 1Gi로 설정되어있기 때문에 1Gi로 나옴

 

web-server-pod 생성 후 볼륨을 마운트 하기 위해서

아래 docs 링크의 PersistentVolumeClaim의 Claims As Volumes 예제 참고

https://kubernetes.io/ko/docs/concepts/storage/persistent-volumes/#%EB%B3%BC%EB%A5%A8%EC%9C%BC%EB%A1%9C-%ED%81%B4%EB%A0%88%EC%9E%84%ED%95%98%EA%B8%B0

 

문제 요구 조건에 맞게 구성 진행

# cat web-server-app.yaml
apiVersion: v1
kind: Pod
metadata:
  name: web-server-pod
spec:
  containers:
    - name: nginx
      image: nginx
      volumeMounts:
      - mountPath: "/usr/share/nginx/html"
        name: mypd
  volumes:
    - name: mypd
      persistentVolumeClaim:
        claimName: app-volume
        
# kubectl apply -f web-server-app.yaml
        
# kubectl get pod

# kubectl describe pod web-server-pod
...
    Mounts:
      /usr/share/nginx/html from mypd (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-rsctq (ro)

...
Volumes:
  mypd:
    Type:       PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
    ClaimName:  app-volume
    ReadOnly:   false

 

Mount 및 Volumes 설정 확인하면 요구 조건에 맞게 구성된걸 확인할 수 있음

 

 

[참고]

- 유투브 따배씨