在kubernetes上配置external-storage

使用nfs在kubernetes上配置external-storage，实现动态存储部署。

必要条件：

• kubernetes集群（git上写的要k8s 1.14以上，但是之前我用1.13也可以用)
• 部署文件：https://github.com/kubernetes-incubator/external-storage在nfs/deploy/kubernetes目录下

安装nfs并启动

#每个节点
yum install nfs-utils rpcbind -y
/bin/systemctl start rpcbind.service
/bin/systemctl start nfs.service

deployment.yaml

其中"-provisioner=example.com/nfs"中example.com可自己设置

apiVersion: v1
kind: ServiceAccount
metadata:
  name: nfs-provisioner
---
kind: Service
apiVersion: v1
metadata:
  name: nfs-provisioner
  labels:
    app: nfs-provisioner
spec:
  ports:
    - name: nfs
      port: 2049
    - name: mountd
      port: 20048
    - name: rpcbind
      port: 111
    - name: rpcbind-udp
      port: 111
      protocol: UDP
  selector:
    app: nfs-provisioner
---
kind: Deployment
apiVersion: apps/v1
metadata:
  name: nfs-provisioner
spec:
  selector:
    matchLabels:
      app: nfs-provisioner
  replicas: 1
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: nfs-provisioner
    spec:
      serviceAccount: nfs-provisioner
      containers:
        - name: nfs-provisioner
          image: quay.io/kubernetes_incubator/nfs-provisioner:latest
          ports:
            - name: nfs
              containerPort: 2049
            - name: mountd
              containerPort: 20048
            - name: rpcbind
              containerPort: 111
            - name: rpcbind-udp
              containerPort: 111
              protocol: UDP
          securityContext:
            capabilities:
              add:
                - DAC_READ_SEARCH
                - SYS_RESOURCE
          args:
            - "-provisioner=example.com/nfs" #更改为
          env:
            - name: POD_IP
              valueFrom:
                fieldRef:
                  fieldPath: status.podIP
            - name: SERVICE_NAME
              value: nfs-provisioner
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
          imagePullPolicy: "IfNotPresent"
          volumeMounts:
            - name: export-volume
              mountPath: /export
      volumes:
        - name: export-volume
          hostPath:
            path: /data/k8s-external-storage
      nodeSelector:
        node: storage

部署deployment.yaml，kubectl apply -f deployment.yaml。

rbac.yaml

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

部署rbac.yaml，kubectl apply -f rbac.yaml。

class.yaml

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: nfs
  annotations:
    volume.beta.kubernetes.io/storage-class: "example-nfs"
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Mi

部署class.yaml，kubectl apply -f class.yaml。

测试外部存储是否可使用

建立claim.yaml

kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: nfs
provisioner: example.com/nfs
mountOptions:
  - vers=4.1

部署claim.yaml，kubectl apply -f claim.yaml。查看pvc，并查看pv是否成功自动构建。

pv.png
pvc.png

成功，可自动部署动态存储。更多信息请参考：https://github.com/kubernetes-incubator/external-storage