本地持久卷 1 节点未找到要绑定的可用持久卷

Question

我开始使用持久卷和 k8s。我试图在安装了 minikube 的 RH7 盒子上使用本地文件夹。我得到了错误：

0/1 nodes are available: 1 node(s) didn't find available persistent volumes to bind.

StorageClass.yaml

kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: local-storage
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer

PersistentVolume.yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: example-local-pv
spec:
  capacity:
    storage: 1Gi
  accessModes:
  - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  storageClassName: local-storage
  local:
    path: /usr/local/docker/vol1
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - my-node

PersistentVolumeClaim.yaml

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: example-local-claim
spec:
  accessModes:
  - ReadWriteOnce
  storageClassName: local-storage
  resources:
    requests:
      storage: 1Gi

Nginx.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
    name: nginx-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
      name: nginx-deployment
  template:
    metadata:
      labels:
        app: nginx
        name: nginx-deployment
    spec:
      containers:
      - name: nginx-deployment
        image: nginx
        ports:
        - containerPort: 80
        volumeMounts:
        - mountPath: "/usr/share/nginx/html"
          name: storage
      volumes:
        - name: storage
          persistentVolumeClaim:
            claimName: example-local-claim

[root@localhost docker]# kubectl get pv

NAME               CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM   STORAGECLASS    REASON   AGE
example-local-pv   1Gi        RWO            Retain           Available           local-storage            76s

[root@localhost docker]# kubectl get pvc

NAME                  STATUS    VOLUME   CAPACITY   ACCESS MODES   STORAGECLASS    AGE
example-local-claim   Pending                                      local-storage   75s

Answer 1

问题在于您的持久卷，您的持久卷具有以下节点选择器：

nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - my-node

您的 PV 试图在名称为 my-node 的节点上绑定的位置，由于没有具有该名称的节点，因此无法找到该节点。请使用以下命令检查您的节点名称：

kubectl get nodes

并将节点名称放在my-node的位置，它会起作用。希望这会有所帮助。

Answer 2

如果您在 Windows 上使用 docker-desktop，请尝试以下操作：

1. 在wsl中创建目录：

docker run --rm -it -v /:/k8s alpine mkdir /k8s/mnt/k8s

1. 创建 storageclass、vol、vol 声明、pod：

kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: local-storage
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: local-storage
spec:
  capacity:
    storage: 50000Gi
  accessModes:
    - ReadWriteMany
  persistentVolumeReclaimPolicy: Retain
  storageClassName: local-storage
  local:
    path: /mnt/k8s
  nodeAffinity:
    required:
      nodeSelectorTerms:
        - matchExpressions:
            - key: kubernetes.io/hostname
              operator: In
              values:
                - docker-desktop
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: postgredb
  namespace: xxx
spec:
  storageClassName: local-storage
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 100Gi
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  labels:
    app: postgres
  name: postgres
  namespace: xxx
spec:
  serviceName: postgres
  selector:
    matchLabels:
      app: postgres
  template:
    metadata:
      labels:
        app: postgres
    spec:
      containers:
        - name: postgres
          image: postgres:14-alpine
          volumeMounts:
            - mountPath: /var/lib/postgresql/data
              name: postgredb
      volumes:
        - name: postgredb
          persistentVolumeClaim:
            claimName: postgredb