kubernetes对接NFS动态存储

存储PK

根据不同的场景，可以考虑用Ceph、GlusterFS或NFS来存储Kubernetes数据。Ceph有较强的性能和容错能力，通常适用于中小规模的Kubernetes组件；GlusterFS具有可伸缩性，适用于在集群上运行大规模工作负载；NFS一般用于专用服务器，具有更高的数据冗余和容错性能。

官网

​​https://github.com/kubernetes-sigs/nfs-subdir-external-provisioner​​

部署NFS

NFS服务器：10.0.7.11

mkdir /data/nfs/ -p
yum -y install nfs-utils rpcbind
cat > /etc/exports <<'eof'
/data/nfs 10.0.7.0/24(rw,no_root_squash)
eof
systemctl enable rpcbind
systemctl enable nfs-server
systemctl start rpcbind
systemctl start nfs-server
exportfs -r 
exportfs

验证NFS

客户端安装nfs-utifs才不会挂载失败，手动挂载验证没问题，再操作动态供应

每台k8s-node都需要安装nfs-utifs，否则部署了provisioner没有安装nfs-utifs则不能部署成功，pod会报挂载失败

yum install -y nfs-utils   # k8s-node做此步即可
systemctl start nfs-utils
systemctl enable nfs-utils
rpcinfo -p
showmount -e 10.0.7.11
mkdir /root/nfsmount
mount -t nfs 10.0.7.11:/data/nfs /root/nfsmount

配置rbac.yaml

​​https://github.com/kubernetes-sigs/nfs-subdir-external-provisioner/blob/master/deploy/rbac.yaml​​

vi 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: ["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

部署deploy.yaml

参考：​​https://github.com/kubernetes-sigs/nfs-subdir-external-provisioner/blob/master/deploy/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: k8s.gcr.io/sig-storage/nfs-subdir-external-provisioner:v4.0.2
          volumeMounts:
            - name: nfs-client-root
              #  这个镜像中volume的mountPath默认为/persistentvolumes，不能修改，否则运行时会报错
              mountPath: /persistentvolumes
          env:
            - name: PROVISIONER_NAME
              # 名字虽然可以随便起，以后引用要一致
              value: k8s-sigs.io/nfs-subdir-external-provisioner
            - name: NFS_SERVER
              value: 10.0.7.11
            - name: NFS_PATH
              value: /data/nfs
      volumes:
        - name: nfs-client-root
          nfs:
            server: 10.0.7.11
            path: /data/nfs

创建pvc

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: test-claim
spec:
  storageClassName: k8s-sigs.io/nfs-subdir-external-provisioner
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Gi

使用PVC

...
    spec:
      containers:
      - name: nginx
        image: nginx:alpine
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
          name: web
        volumeMounts:                        #挂载容器中的目录到pvc nfs中的目录
        - name: www
          mountPath: /usr/share/nginx/html
      volumes:
      - name: www
        persistentVolumeClaim:              #指定pvc
          claimName: pvc-nfs
...