使用kuberntes storageclass动态提供cephfs存储

概述

1）ceph集群：nautilus版，monitoring为192.168.39.19-21
2）kuberntes集群环境：v1.14.2
3）集成方式：storageclass动态提供存储
4）k8s集群的节点已安装ceph-common包。

1）步骤1：在ceph中创建cephfs文件系统

#1：启动mds组件
ceph-deploy --overwrite-conf mds create node1 datanode2

#2：创建cephfs文件系统
ceph osd pool create cephfs_data 8 8
ceph osd pool create cephfs_meta 2 2
ceph fs new mycephfs cephfs_meta cephfs_data

2）步骤2：在k8s中创建存放ceph admin用户的secret

#创建secret对象保存ceph admin用户的key
kubectl create secret generic ceph-admin --type="kubernetes.io/rbd" --from-literal=key=AQAyTvhe+Q/SKBAAP/DtVX154cxmGn7z+P6aGg== --namespace=kube-system

3）步骤3：部署cephfs csi

[root@master rbac]# cat serviceaccount.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: cephfs-provisioner
  namespace: kube-system

[root@master rbac]# cat role.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: cephfs-provisioner
  namespace: kube-system
rules:
  - apiGroups: [""]
    resources: ["secrets"]
    verbs: ["create", "get", "delete"]
  - apiGroups: [""]
    resources: ["endpoints"]
    verbs: ["get", "list", "watch", "create", "update", "patch"]

[root@master rbac]# cat rolebinding.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: cephfs-provisioner
  namespace: kube-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: cephfs-provisioner
subjects:
- kind: ServiceAccount
  name: cephfs-provisioner

[root@master rbac]# cat clusterrole.yaml
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: cephfs-provisioner
  namespace: kube-system
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"]
    resourceNames: ["kube-dns","coredns"]
    verbs: ["list", "get"]

[root@master rbac]# cat clusterrolebinding.yaml
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: cephfs-provisioner
subjects:
  - kind: ServiceAccount
    name: cephfs-provisioner
    namespace: kube-system
roleRef:
  kind: ClusterRole
  name: cephfs-provisioner
  apiGroup: rbac.authorization.k8s.io

[root@master rbac]# cat deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: cephfs-provisioner
  namespace: kube-system
spec:
  replicas: 1
  selector:
    matchLabels:
      app: cephfs-provisioner
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: cephfs-provisioner
    spec:
      containers:
      - name: cephfs-provisioner
        image: "quay-mirror.qiniu.com/external_storage/cephfs-provisioner:latest"
        env:
        - name: PROVISIONER_NAME
          value: ceph.com/cephfs
        - name: PROVISIONER_SECRET_NAMESPACE
          value: kube-system
        command:
        - "/usr/local/bin/cephfs-provisioner"
        args:
        - "-id=cephfs-provisioner-1"
      serviceAccount: cephfs-provisioner

4）步骤4：创建storageclass

[root@master rbac]# cat storageclass.yaml
kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: cephfs
provisioner: ceph.com/cephfs
parameters:
  monitors: 192.168.39.19:6789,192.168.39.20:6789,192.168.39.21:6789
  adminId: admin
  adminSecretName: ceph-admin
  adminSecretNamespace: kube-system
  claimRoot: /volumes/kubernetes

5）步骤5：创建pvc

[root@master rbac]# cat test-pvc.yaml
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: cephfs-claim
spec:
  accessModes:     
  - ReadWriteOnce
  storageClassName: cephfs
  resources:
    requests:
      storage: 32Mi

创建的pvc会和自动地与csi插件创建的pv对象进行绑定，如图所示：

6）步骤6：创建使用pvc的pod

[root@master rbac]# cat pod-busybox-cephfs.yaml
apiVersion: v1
kind: Pod
metadata:
  name: cephfs-busybox
spec:
  containers:
  - name: ceph-busybox
    image: busybox:1.27
    command: ["sleep", "60000"]
    volumeMounts:
    - name: ceph-vol1
      mountPath: /usr/share/busybox
      readOnly: false
  volumes:
  - name: ceph-vol1
    persistentVolumeClaim:
      claimName: cephfs-claim

pod创建成功，事件如图所示：

进入pod中查看挂载信息，可发现容器已经挂载远程cephfs：