k8s之StorageClass(NFS)

2024-02-28 09:49:04

k8s之StorageClass(NFS)

实验环境

k8s环境参考： k8s-v1.20.10 二进制部署指导文档

NFS-Subdir-External-Provisioner 简介

NFS-Subdir-External-Provisioner是一个自动配置卷程序，它使用现有的和已配置的 NFS 服务器来支持通过持久卷声明动态配置 Kubernetes 持久卷，PV命名规则如下

  1. PV以 ${namespace}-${pvcName}-${pvName}的命名格式提供（在NFS服务器上）
  2. PV回收的时候以 archieved-${namespace}-${pvcName}-${pvName} 的命名格式（在NFS服务器上）

NFS-Subdir-External-Provisioner此组件是对nfs-client-provisioner 的扩展，nfs-client-provisioner 已经不提供更新，且 nfs-client-provisioner 的 Github 仓库已经迁移到 NFS-Subdir-External-Provisioner的仓库，GitHub地址

NFS服务器配置

所以节点必须安装nfs-utils

# 具体配置过程略，这里仅看下nfs配置
[root@k8s-node-1 k8s-nfs]# cat /etc/exports
/data/k8s-nfs/nfs-provisioner 192.168.0.0/24(rw,no_root_squash)

创建ServiceAccount

[root@k8s-master-1 storageClass]# cat serviceaccount.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: ["nodes"]
    verbs: ["get", "list", "watch"]
  - 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

部署 NFS-Subdir-External-Provisioner

[root@k8s-master-1 storageClass]# 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:
      nodeName: k8s-master-1   #设置在master节点运行
      tolerations:             #设置容忍master节点污点
      - key: node-role.kubernetes.io/master
        operator: Equal
        value: "true"
      serviceAccountName: nfs-client-provisioner
      containers:
        - name: nfs-client-provisioner
          image: registry.cn-hangzhou.aliyuncs.com/jiayu-kubernetes/nfs-subdir-external-provisioner:v4.0.0
          imagePullPolicy: IfNotPresent
          volumeMounts:
            - name: nfs-client-root
              mountPath: /persistentvolumes
          env:
            - name: PROVISIONER_NAME
              value: k8s/nfs-subdir-external-provisioner
            - name: NFS_SERVER
              value: 192.168.0.11
            - name: NFS_PATH
              value: /data/k8s-nfs/nfs-provisioner
      volumes:
        - name: nfs-client-root
          nfs:
            server: 192.168.0.11  # NFS SERVER_IP
            path: /data/k8s-nfs/nfs-provisioner
            
# 查看pods
[root@k8s-master-1 storageClass]# kubectl get pods
NAME                                      READY   STATUS    RESTARTS   AGE
nfs-client-provisioner-67d8f9ffff-vfvgd   1/1     Running   0          2m56s

创建NFS StorageClass

[root@k8s-master-1 storageClass]# cat storage.yaml 
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: managed-nfs-storage
  annotations:
    storageclass.kubernetes.io/is-default-class: "false"  # 是否设置为默认的storageclass
provisioner: k8s/nfs-subdir-external-provisioner # or choose another name, must match deployment's env PROVISIONER_NAME'
allowVolumeExpansion: true
parameters:
  archiveOnDelete: "false" # 设置为"false"时删除PVC不会保留数据,"true"则保留数据

# 查看storageclass
[root@k8s-master-1 storageClass]# kubectl get storageclass
NAME                  PROVISIONER                           RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
managed-nfs-storage   k8s/nfs-subdir-external-provisioner   Delete          Immediate           true                   19m

创建PVC

[root@k8s-master-1 storageClass]# cat pvc.yaml 
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nfs-claim
spec:
  storageClassName: managed-nfs-storage
  accessModes: ["ReadWriteMany","ReadOnlyMany"]
  resources:
    requests:
      storage: 100Mi

# 查看pvc
[root@k8s-master-1 storageClass]# kubectl get pvc
NAME        STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS          AGE
nfs-claim   Bound    pvc-0258363b-6549-481e-9a6e-5dd4e1eca1ea   100Mi      ROX,RWX        managed-nfs-storage   3s
[root@k8s-master-1 storageClass]# kubectl get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM               STORAGECLASS          REASON   AGE
pvc-0258363b-6549-481e-9a6e-5dd4e1eca1ea   100Mi      ROX,RWX        Delete           Bound    default/nfs-claim   managed-nfs-storage            12s

# k8s-node-1节点查看存储
[root@k8s-node-1 nfs-provisioner]# tree default-nfs-claim-pvc-0258363b-6549-481e-9a6e-5dd4e1eca1ea/
default-nfs-claim-pvc-0258363b-6549-481e-9a6e-5dd4e1eca1ea/

创建Pod并绑定PV

[root@k8s-master-1 storageClass]# cat busybox.yaml 
apiVersion: v1
kind: Pod
metadata:
  name: test-pod
spec:
  containers:
  - name: test-pod
    image: busybox:1.28
    imagePullPolicy: IfNotPresent
    command:
      - "/bin/sh"
    args:
      - "-c"
      - "sleep 3600"
    volumeMounts:
      - name: nfs-pvc
        mountPath: "/mnt/busybox"
  restartPolicy: "Never"
  volumes:
    - name: nfs-pvc
      persistentVolumeClaim:
        claimName: nfs-claim

[root@k8s-master-1 storageClass]# kubectl exec -it test-pod -- ls /mnt/busybox/
[root@k8s-master-1 storageClass]# kubectl exec -it test-pod -- touch /mnt/busybox/test.txt

#k8s-node-1查看
[root@k8s-node-1 default-nfs-claim-pvc-bf5f8a3a-92ee-4ea4-baf1-156cdb87230e]# pwd
/data/k8s-nfs/nfs-provisioner/default-nfs-claim-pvc-bf5f8a3a-92ee-4ea4-baf1-156cdb87230e
[root@k8s-node-1 default-nfs-claim-pvc-bf5f8a3a-92ee-4ea4-baf1-156cdb87230e]# ls
test.txt
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