【CKA模拟题】容忍度策略实战案例

Useful Resources: Persistent Volumes Claim , Pod to Use a PV

题干

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

kubectl config use-context kubernetes-admin@kubernetes

A Kubernetes pod definition file named nginx-pod-cka.yaml is available. Your task is to make the following modifications to the manifest file:

• Create a Persistent Volume Claim (PVC) with the name nginx-pvc-cka . This PVC should request 80Mi of storage from an existing Persistent Volume (PV) named nginx-pv-cka and Storage Class namednginx-stc-cka . Use the access mode ReadWriteOnce .
• Add the created nginx-pvc-cka PVC to the existing nginx-pod-cka POD definition.
• Mount the volume claimed by nginx-pvc-cka at the path /var/www/html within the nginx-pod-cka POD.
• Add tolerations with the key node-role.kubernetes.io/control-plane set to Exists and effect NoSchedule to the nginx-pod-cka Pod
• Ensure that the peach-pod-cka05-str POD is running and that the Persistent Volume (PV) is successfully bound .

一个名为nginx-pod-cka的Kubernetes pod定义文件。可以使用Yaml。您的任务是对清单文件进行以下修改:

• 创建一个名为nginx-pvc-cka的持久卷声明(PVC)。这个PVC应该从现有的名为nginx-pv-cka的持久卷(PV)和名为nginx-stc-cka的存储类请求80Mi的存储空间。请使用ReadWriteOnce访问模式。
• 将创建的nginx-pvc-cka PVC添加到现有的nginx-pod-cka POD定义中。
• 将nginx-pvc-cka请求的卷挂载到nginx-pod-cka的/var/www/html路径。
• 使用关键节点node-role.kubernetes添加tolerations 。设置为“Exists”，对nginx-pod-cka Pod生效“NoSchedule”
• 确保peach-pod-cka05-str POD正在运行，并且PV (Persistent Volume)已成功绑定。

解题思路

1. 切换集群环境

kubectl config use-context kubernetes-admin@kubernetes

2. 创建一个名为nginx-pvc-cka的PVC资源

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nginx-pvc-cka
spec:
  volumeName: nginx-pv-cka
  storageClassName: nginx-stc-cka
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 80Mi

提交PVC资源，并查看PVC状态

controlplane $ k apply  -f nginx-pvc-cak.yaml 
persistentvolumeclaim/nginx-pvc-cka created
controlplane $ k get pvc
NAME            STATUS   VOLUME         CAPACITY   ACCESS MODES   STORAGECLASS    VOLUMEATTRIBUTESCLASS   AGE
nginx-pvc-cka   Bound    nginx-pv-cka   100Mi      RWO            nginx-stc-cka   <unset>                 10s

3. 把PVC资源引用到nginx-pod-ckaPod中，资源清单如下：

apiVersion: v1
kind: Pod
metadata:
  name: nginx-pod-cka
spec:
  volumes:
  - name: pv-storage
    persistentVolumeClaim:
       claimName: nginx-pvc-cka
  tolerations:
  - key: 'node-role.kubernetes.io/control-plane'
    operator: 'Exists'
    effect: 'NoSchedule'
  containers:
    - name: my-container
      image: nginx:latest
      volumeMounts:
      - mountPath: "/var/www/html"
        name: pv-storage

提交清单，并查看Pod的创建情况

controlplane $ k apply  -f nginx-pod-cka.yaml 
pod/nginx-pod-cka created
controlplane $ k get pod
NAME            READY   STATUS    RESTARTS   AGE
nginx-pod-cka   1/1     Running   0          11s