POD 处于挂起状态，因为 PV 和 PVC 无法删除

Question

我遇到了与 PV 和 PVC 有关的问题，我真的不知道如何解决。有人可以提供一些见解吗？

Github -> https://github.com/Sarony11/wordpress-k8s/tree/main/k8s

文件： wordpress-pv.yaml（添加在 cmets 之后）

apiVersion: v1
kind: PersistentVolume
metadata:
  name: wp1-pv
  labels:
    app: wordpress
spec:
  capacity:
    storage: 5Gi
  storageClassName: standard
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  hostPath:
    path: /tmp/data

wordpress-pv-claim.yaml

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: wp1-pv-claim
  labels:
    app: wordpress
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi
  storageClassName: standard
  volumeName: wp1-html

wordpress-deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: wp1-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: wordpress
      tier: frontend
      component: app
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: wordpress
        tier: frontend
        component: app
    spec:
      containers:
      - image: wordpress:5.6.0-apache
        name: wp1
        env:
          - name: WORDPRESS_DB_HOST
            value: "35.204.214.81"
          - name: WORDPRESS_DB_USER
            value: wordpressdb
          - name: WORDPRESS_DB_PASSWORD
            valueFrom:
              secretKeyRef:
                name: mysql-pass
                key: password
        ports:
        - containerPort: 80
          name: wp1-port
        volumeMounts:
        - name: wp1-pv
          mountPath: /var/www/html
      volumes:
      - name: wp1-pv
        persistentVolumeClaim:
          claimName: wp1-pv-claim

命令

administrator@master-ubuntu:~/learning/wordpress-k8s$ microk8s.kubectl apply -k k8s
secret/mysql-pass-7m4b7ft482 created
service/wp1-clusterip-service created
ingress.networking.k8s.io/ingress-service created
persistentvolume/wp1-pv created
persistentvolumeclaim/wp1-pv-claim created



administrator@master-ubuntu:~/learning/wordpress-k8s$ microk8s.kubectl get 
pv,pvc -n default
NAME                      CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM   STORAGECLASS   REASON   AGE
persistentvolume/wp1-pv   5Gi        RWO            Retain           Available           standard                74s

NAME                                 STATUS    VOLUME     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
persistentvolumeclaim/wp1-pv-claim   Pending   wp1-html   0                         standard  

 74s

administrator@master-ubuntu:~/learning/wordpress-k8s$ microk8s.kubectl describe pv wp1-pv
Name:            wp1-pv
Labels:          app=wordpress
Annotations:     <none>
Finalizers:      [kubernetes.io/pv-protection]
StorageClass:    standard
Status:          Available
Claim:
Reclaim Policy:  Retain
Access Modes:    RWO
VolumeMode:      Filesystem
Capacity:        5Gi
Node Affinity:   <none>
Message:
Source:
    Type:          HostPath (bare host directory volume)
    Path:          /tmp/data
    HostPathType:
Events:            <none>


administrator@master-ubuntu:~/learning/wordpress-k8s$ microk8s.kubectl describe pvc wp1-pv-claim
Name:          wp1-pv-claim
Namespace:     default
StorageClass:  standard
Status:        Pending
Volume:        wp1-html
Labels:        app=wordpress
Annotations:   <none>
Finalizers:    [kubernetes.io/pvc-protection]
Capacity:      0
Access Modes:
VolumeMode:    Filesystem
Mounted By:    wp1-app-54ddf5fb78-7f8j6
               wp1-app-54ddf5fb78-hgqmj
               wp1-app-54ddf5fb78-sxn9j
Events:        <none>

PV 和 PVS 的结果仍然是 Pending，当然，Pod 也处于 Pending。

Answer 1

请检查/分享 pvc 和 pv 的状态。

检查状态

#kubectl get pvc,pv -n <namespace>

描述pvc和pv。

#kubectl describe pvc <PVC-name> -n namespace
#kubectl describe pv <PV-name> -n namespace

Answer 2

所以这里的问题是您没有创建任何持久卷。
这就是为什么你的 pvc 和你的 pod 一样保持pending 的原因。

要使其正常工作，您需要提供一个符合 pvc 规范的 PV

spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi
  volumeName: "wp-html"

下面是一个应该与你的 pvc 匹配的 PV 示例

apiVersion: v1
kind: PersistentVolume
metadata:
  name: wp-html
  labels:
    app: wordpress
spec:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  hostPath:
    path: /data/pv/wp-html

此 PV 会将数据存储在 本地节点上的 /data/pv/wp-html 文件夹下。

Answer 3

我已经在我的环境中测试过了，可以给你一些建议。 在开始之前阅读如何在 Kubernetes 中正确配置动态配置 - dynamics-provisioning-kubernetes。

1. 你的 pv yaml 没问题。
2. 从 pvc yaml 文件中删除 volumeName 字段：

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: wp1-pv-claim
  labels:
    app: wordpress
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi
  storageClassName: standard

因此，您的 pvc 将成功绑定到现有 pv。

1. 在 Deployment yaml 文件中更改 volumeMounts 值，例如更改为 wp1-pv-storage：

apiVersion: apps/v1
kind: Deployment
metadata:
  name: wp1-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: wordpress
      tier: frontend
      component: app
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: wordpress
        tier: frontend
        component: app
    spec:
      containers:
      - image: wordpress:5.6.0-apache
        name: wp1
        env:
          - name: WORDPRESS_DB_HOST
            value: "35.204.214.81"
          - name: WORDPRESS_DB_USER
            value: wordpressdb
          - name: WORDPRESS_DB_PASSWORD
            valueFrom:
              secretKeyRef:
                name: mysql-pass
                key: password
        ports:
        - containerPort: 80
          name: wp1-port
        volumeMounts:
        - name: wp1-pv-storage
          mountPath: /var/www/html
      volumes:
      - name: wp1-pv-storage
        persistentVolumeClaim:
          claimName: wp1-pv-claim