运维开发实践 - Kubernetes - NFS StorageClass部署

1. 介绍

NFS(Network File System), 是一种通过网络，让不同计算机共享文件的实现方式；

2. 部署实现

2.1. 配置NFS Server

# install in all vms
yum install -y nfs-utils

我们选择一台机子作为NFS服务器

# 我们将 /root/kubernetes/data/nfs 作为NFS服务器共享目录
echo "/root/kubernetes/data/nfs *(insecure,rw,no_root_squash)" > /etc/exports

mkdir -p /root/kubernetes/data/nfs
systemctl enable rpcbind --now
systemctl enable nfs-server --now
exportfs -r

2.2. 部署StorageClass

HINT: 注意将如下文件中 192.168.31.175 替换为你的NFS Server的IP地址;
HINT: 注意由于我将/root/kubernetes/data/nfs 作为了NFS地址，因此下文也需要保持一致；

kind: ServiceAccount
apiVersion: v1
metadata:
  name: nfs-client-provisioner
---
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
    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
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
subjects:
  - kind: ServiceAccount
    name: nfs-client-provisioner
    # replace with namespace where provisioner is deployed
roleRef:
  kind: Role
  name: leader-locking-nfs-client-provisioner
  apiGroup: rbac.authorization.k8s.io
---
kind: Deployment
apiVersion: apps/v1
metadata:
  name: nfs-client-provisioner
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nfs-client-provisioner
  template:
    metadata:
      labels:
        app: nfs-client-provisioner
    spec:
      serviceAccountName: nfs-client-provisioner
      containers:
        - name: nfs-client-provisioner
          image: willdockerhub/nfs-subdir-external-provisioner:v4.0.2
          imagePullPolicy: IfNotPresent
          volumeMounts:
            - name: nfs-client-root
              mountPath: /persistentvolumes
          env:
            - name: PROVISIONER_NAME
              value: nfs-provisioner		#PROVISIONER_NAME的Value值与StorageClass的Provisioner字段值必须保持一致
            - name: NFS_SERVER
              value: 192.168.31.175			#请使用文件存储的挂载目标IP地址替换
            - name: NFS_PATH
              value: /root/kubernetes/data/nfs	#请使用挂载目标支持的目录替换，默认挂载到/cfs目录
      volumes:
        - name: nfs-client-root
          nfs:
            server: 192.168.31.175			#请使用文件存储的挂载目标IP地址替换
            path: /root/kubernetes/data/nfs
---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: nfs-client
  annotations:
    "storageclass.kubernetes.io/is-default-class": "true"   #添加此注释
provisioner: nfs-provisioner	 #or choose another name, must match deployment's env PROVISIONER_NAME'
parameters:
  archiveOnDelete: "false"

3. 开始使用

我们在声明pvc的时候显式声明storageClass即可

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: prometheus-storage-pvc
  namespace: monitoring
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: nfs-client
  resources:
    requests:
      storage: 5Gi

4. Reference

kubernetes Volume