【CKA模拟题】StorageClass实战案例分析

Useful Resources: Storage Classes , Persistent Volumes Claim , Pods

题干

For this question, please set this context (In exam, diff cluster name)

kubectl config use-context kubernetes-admin@kubernetes

• Create a Storage Class named fast-storage with a provisioner of kubernetes.io/no-provisioner and a volumeBindingMode of Immediate .
• Create a Persistent Volume (PV) named fast-pv-cka with a storage capacity of 50Mi using the fast-storage Storage Class with ReadWriteOnce permission and host path /tmp/fast-data .
• Create a Persistent Volume Claim (PVC) named fast-pvc-cka that requests 30Mi of storage from the fast-pv-cka PV(using the fast-storage Storage Class).
• Create a Pod named fast-pod-cka with nginx:latest image that uses the fast-pvc-cka PVC and mounts the volume at the path /app/data .
• 使用kubernetes.io/no-provision提供程序创建一个名为fast-storage的存储类。volumeBindingMode为Immediate。
• 创建一个名为fast-pv-cka的持久卷，存储容量为50Mi，使用fast-storage存储类，具有 ReadWriteOnce权限，主机路径为/tmp/fast-data。
• 创建一个名为fast-pvc-cka的持久卷声明(PVC)，它从fast-pv-cka PV请求30Mi的存储空间(使用fast-storage存储类)。
• 使用nginx:latest 镜像创建一个名为fast-pod-cka的Pod，使用fast-pvc-cka PVC并将卷挂载到/app/data路径。

解题思路

1. 创建一个名为 fast-storage的Storage CLass。资源清单如下：

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: fast-storage
provisioner: kubernetes.io/no-provisioner
reclaimPolicy: Retain
allowVolumeExpansion: true
volumeBindingMode: Immediate

2. 提交fast-storage.yaml资源清单，如下

controlplane $ k apply  -f fast-storage.yaml 
storageclass.storage.k8s.io/fast-storage created

3. 创建一个名为fast-pv-cka的PV，资源清单如下：

apiVersion: v1
kind: PersistentVolume
metadata:
  name: fast-pv-cka
spec:
  storageClassName: fast-storage
  capacity:
    storage: 50Mi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/tmp/fast-data"

4. 提交fast-pv-cka.yaml资源清单，如下

controlplane $ k apply -f fast-pv-cka.yaml 
persistentvolume/fast-pv-cka created

5. 创建一个名为fast-pvc-cka的PV，资源清单如下：

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: fast-pvc-cka
spec:
  storageClassName: fast-storage
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 30Mi

6. 提交fast-pvc-cka.yaml资源清单，如下

controlplane $ k apply -f fast-pvc-cka.yaml 
persistentvolumeclaim/fast-pvc-cka created

7. 创建一个名为fast-pod-cka的pod，资源清单如下：

apiVersion: v1
kind: Pod
metadata:
  name: fast-pod-cka
spec:
  volumes:
    - name: pv-storage
      persistentVolumeClaim:
        claimName: fast-pvc-cka
  containers:
    - name: nginx-container
      image: nginx:latest
      volumeMounts:
        - mountPath: "/app/data"
          name: pv-storage

8. 提交fast-pod-cka.yaml资源清单，如下

controlplane $ k apply -f fast-pod-cka.yaml 
pod/fast-pod-cka created

9. 验证结果

controlplane $ k get pod
NAME           READY   STATUS    RESTARTS   AGE
fast-pod-cka   1/1     Running   0          38s