NFS动态存储实战案例

Kubernetes 不包含内部 NFS 驱动。你需要使用外部驱动为 NFS 创建 StorageClass。

卷插件	内置配置器	配置示例
AzureFile	✓	Azure File
CephFS	-	-
FC	-	-
FlexVolume	-	-
iSCSI	-	-
Local	-	Local
NFS	-	NFS
PortworxVolume	✓	Portworx Volume
RBD	✓	Ceph RBD
VsphereVolume	✓	vSphere

1、开放后端存储NFS

[root@web04 ~]# mkdir -pv /kubelet/storage_class
[root@web04 ~]# tail -n1 /etc/exports
/kubelet/storage_class 10.0.0.0/24(rw,sync,no_root_squash,no_subtree_check)
[root@web04 ~]# systemctl restart nfs-server.service
[root@web04 ~]# exportfs
/kubelet/storage_class
		10.0.0.0/24

2、部署NFS驱动器支持SC功能

[root@k8smaster01 ~]# git clone https://gitee.com/yinzhengjie/k8s-external-storage.git
[root@k8smaster01 ~]# cd k8s-external-storage/nfs-client/deploy/

# 修改配置文件
[root@k8smaster01 deploy]# cat 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-client-provisioner
      containers:
        - name: nfs-client-provisioner
          # image: quay.io/external_storage/nfs-client-provisioner:latest
          image: registry.cn-hangzhou.aliyuncs.com/k8s_study_rfb/nfs-subdir-external-provisioner:v4.0.0
          volumeMounts:
            - name: nfs-client-root
              mountPath: /persistentvolumes
          env:
            - name: PROVISIONER_NAME
              value: fuseim.pri/ifs
            - name: NFS_SERVER
              value: 10.0.0.2
            - name: NFS_PATH
              value: /kubelet/storage_class
      volumes:
        - name: nfs-client-root
          nfs:
            server: 10.0.0.7
            path: /kubelet/storage_class


#修改动态存储类配置文件
[root@k8smaster01 deploy]# cat class.yaml
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: managed-nfs-storage
provisioner: fuseim.pri/ifs # or choose another name, must match deployment's env PROVISIONER_NAME'
parameters:
  # archiveOnDelete: "false"
  archiveOnDelete: "true"

#应用动态存储类
[root@k8smaster01 deploy]# kubectl apply -f class.yaml && kubectl get sc
storageclass.storage.k8s.io/managed-nfs-storage created
NAME                  PROVISIONER      RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
managed-nfs-storage   fuseim.pri/ifs   Delete          Immediate           false                  0s

[root@k8smaster01 deploy]# kubectl get sc
NAME                  PROVISIONER      RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
managed-nfs-storage   fuseim.pri/ifs   Delete          Immediate           false                  10m

3、应用RBAC角色

[root@k8smaster01 deploy]# cat rbac.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: nfs-client-provisioner
  # replace with namespace where provisioner is deployed
  namespace: default
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: nfs-client-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"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: run-nfs-client-provisioner
subjects:
  - kind: ServiceAccount
    name: nfs-client-provisioner
    # replace with namespace where provisioner is deployed
    namespace: default
roleRef:
  kind: ClusterRole
  name: nfs-client-provisioner-runner
  apiGroup: rbac.authorization.k8s.io
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: leader-locking-nfs-client-provisioner
  # replace with namespace where provisioner is deployed
  namespace: default
rules:
  - apiGroups: [""]
    resources: ["endpoints"]
    verbs: ["get", "list", "watch", "create", "update", "patch"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: leader-locking-nfs-client-provisioner
  # replace with namespace where provisioner is deployed
  namespace: default
subjects:
  - kind: ServiceAccount
    name: nfs-client-provisioner
    # replace with namespace where provisioner is deployed
    namespace: default
roleRef:
  kind: Role
  name: leader-locking-nfs-client-provisioner
  apiGroup: rbac.authorization.k8s.io

#应用RBAC授权角色
[root@k8smaster01 deploy]#  kubectl apply -f rbac.yaml

#应用NFS动态存储配置器
[root@k8smaster01 deploy]# kubectl apply -f deployment.yaml


[root@k8smaster01 deploy]# kubectl get pods,sc
NAME                                          READY   STATUS    RESTARTS   AGE
pod/nfs-client-provisioner-5db5f57976-ghs8l   1/1     Running   0          4s

NAME                                              PROVISIONER      RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
storageclass.storage.k8s.io/managed-nfs-storage   fuseim.pri/ifs   Delete          Immediate           false                  11m

4、测试动态存储类

# PVC配置文件
[root@k8smaster01 deploy]# cat test-claim.yaml
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: test-claim
  #以注解的方式指定sc资源
  annotations:
    volume.beta.kubernetes.io/storage-class: "managed-nfs-storage"
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Mi

#Pod配置文件
[root@k8smaster01 deploy]# cat test-pod.yaml
kind: Pod
apiVersion: v1
metadata:
  name: test-pod
spec:
  containers:
  - name: test-pod
    image: busybox
    command:
      - "/bin/sh"
    args:
      - "-c"
      - "touch /mnt/SUCCESS && exit 0 || exit 1"
    volumeMounts:
      - name: nfs-pvc
        mountPath: "/mnt"
  restartPolicy: "Never"
  volumes:
    - name: nfs-pvc
      persistentVolumeClaim:
        claimName: test-claim
[root@k8smaster01 deploy]# kubectl apply -f test-claim.yaml -f test-pod.yaml


#后端存储目录
[root@web04 ~]# ll /kubelet/storage_class/
total 0
drwxrwxrwx 2 root root 21 Dec 11 15:29 default-test-claim-pvc-72dca5dd-eb1e-4826-a18a-0773acfe55cf
[root@web04 ~]# ll /kubelet/storage_class/default-test-claim-pvc-72dca5dd-eb1e-4826-a18a-0773acfe55cf/
total 0
-rw-r--r-- 1 root root 0 Dec 11 15:29 SUCCESS