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k8s 之storageclass使用nfs动态申请PV

要在 Kubernetes 中使用 StorageClass 来创建 NFS 存储,首先你需要确保 NFS 服务器已经设置好并且可以访问。然后,你可以创建一个自定义的 StorageClass,并利用它来动态创建多个 PersistentVolume (PV),每个 PersistentVolume 都会使用 NFS 存储。

配置角色权限

就是用户通过角色与权限进行关联。

kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: nfs-provisioner-runner
rules:
  - apiGroups: [""]
    resources: ["persistentvolumes"]
    verbs: ["get", "list", "watch", "create", "delete"]
  - apiGroups: [""]
    resources: ["persistentvolumeclaims"]
    verbs: ["get", "list", "watch", "update"]
  - apiGroups: ["storage.k8s.io"]
    resources: ["storageclasses"]
    verbs: ["get", "list", "watch"]
  - apiGroups: [""]
    resources: ["events"]
    verbs: ["create", "update", "patch"]
  - apiGroups: [""]
    resources: ["services", "endpoints"]
    verbs: ["get"]
  - apiGroups: ["extensions"]
    resources: ["podsecuritypolicies"]
    resourceNames: ["nfs-provisioner"]
    verbs: ["use"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: run-nfs-provisioner
subjects:
  - kind: ServiceAccount
    name: nfs-provisioner
     # replace with namespace where provisioner is deployed
    namespace: default
roleRef:
  kind: ClusterRole
  name: nfs-provisioner-runner
  apiGroup: rbac.authorization.k8s.io
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: leader-locking-nfs-provisioner
rules:
  - apiGroups: [""]
    resources: ["endpoints"]
    verbs: ["get", "list", "watch", "create", "update", "patch"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: leader-locking-nfs-provisioner
subjects:
  - kind: ServiceAccount
    name: nfs-provisioner
    # replace with namespace where provisioner is deployed
    namespace: default
roleRef:
  kind: Role
  name: leader-locking-nfs-provisioner
  apiGroup: rbac.authorization.k8s.io
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: nfs-provisioner
  namespace: default
kubectl apply -f rbac.yaml 

部署nfs-client-provisioner

新增 nfs 的 Deployment 配置 deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nfs-client-provisioner
  labels:
    app: nfs-client-provisioner
  # replace with namespace where provisioner is deployed
  namespace: default
spec:
  replicas: 1
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app: nfs-client-provisioner
  template:
    metadata:
      labels:
        app: nfs-client-provisioner
    spec:
      serviceAccountName: nfs-provisioner
      containers:
        - name: nfs-client-provisioner
          image: gmoney23/nfs-client-provisioner
          imagePullPolicy: IfNotPresent
          volumeMounts:
            - name: nfs-client-root
              mountPath: /persistentvolumes
          env:
            - name: PROVISIONER_NAME
              value: nfs-diy # StorageClass 三个重要字段之一 Provisioner,名字自己指定
            - name: NFS_SERVER
              value: 192.168.56.115 # nfs 服务器地址
            - name: NFS_PATH
              value: /mnt/nfs # nfs 共享文件夹
      volumes:
        - name: nfs-client-root
          nfs:
            server: 192.168.56.115 # nfs 服务器地址
            path: /mnt/nfs # nfs 共享文件夹

创建 NFS StorageClass

首先,我们需要创建一个 StorageClass,它指定使用 NFS 存储后端。以下是一个示例 YAML 文件,它定义了一个名为 nfs-storageStorageClass,使用 NFS 动态 Provisioning 来创建 PV。

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: nfs-storage
provisioner: nfs-diy # 和 deployment.yaml 中 env.PROVISIONER_NAME 保持一致
reclaimPolicy: Retain
parameters:
  archiveOnDelete: "false"

创建 PVC 来动态申请 PV

你可以创建一个 PersistentVolumeClaim (PVC),它会根据指定的 StorageClass 动态申请一个 PV。以下是一个示例 YAML 文件,它请求一个大小为 1Mi 的 PVC,并且使用刚才创建的 nfs-storage StorageClass

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: test-claim
  annotations:
    volume.beta.kubernetes.io/storage-class: "nfs-storage"
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Mi
  storageClassName: nfs-storage  # 使用我们创建的 StorageClass

在 Pod 中使用 PVC

当你有了 PVC 和 PV 后,可以在 Pod 中使用 PVC 来挂载存储。以下是一个示例 Pod,它使用了 test-claim PVC 来挂载 NFS 存储:

kind: Pod
apiVersion: v1
metadata:
  name: test-pod-nginx
spec:
  containers:
    - name: test-pod-nginx-containers
      image: nginx:latest
      ports:
        - containerPort: 80
          name: "http-server"
          hostPort: 80
      volumeMounts:
        - name: test-pod-nginx-storage
          mountPath: "/usr/share/nginx/html"
  restartPolicy: "Never"
  volumes:
    - name: test-pod-nginx-storage
      persistentVolumeClaim:
        claimName: test-claim

验证存储是否正确挂载

部署 Pod 后,你可以通过执行 kubectl exec 命令进入 Pod,检查 NFS 存储是否正确挂载:

kubectl exec -it test-pod-nginx /bin/bash
cd /mnt/nfs/default-test-claim-pvc-d07ea120-55ca-40d1-8fa3-01d01eb32193
echo "hello" > index.html

访问 http://192.168.56.115/

使用 kubectljq 筛选 PVC

你也可以通过 kubectl get pvc -o json 并结合 jq 工具来筛选所有使用指定 StorageClass 的 PVC。例如:

kubectl get pvc -o json | jq '.items[] | select(.spec.storageClassName == "nfs-storage") | .metadata.name'

这将输出所有使用 nfs-storage StorageClass 的 PVC 名称。

waiting for a volume to be created, either by external provisioner “nfs-diy” or manually created by system administrator

如果是 v1.20 版本以上 apiserver 默认禁止使用 selfLink,需要手动配置- --feature-gates=RemoveSelfLink=false 开启。

修改kube-apiserver.yaml 文件:

[root@master nfs]# cat /etc/kubernetes/manifests/kube-apiserver.yaml
apiVersion: v1
kind: Pod
metadata:
  annotations:
    kubeadm.kubernetes.io/kube-apiserver.advertise-address.endpoint: 192.168.25.100:6443
  creationTimestamp: null
  labels:
    component: kube-apiserver
    tier: control-plane
  name: kube-apiserver
  namespace: kube-system
spec:
  containers:
  - command:
    - kube-apiserver
    - --advertise-address=192.168.25.100
    - --feature-gates=RemoveSelfLink=false   # 添加这条信息
    - --allow-privileged=true


原文地址:https://blog.csdn.net/qq_37362891/article/details/144290194

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