K8S使用cephcsi持久化存储之CephFS

参考：

https://www.cnblogs.com/wsjhk/p/13710577.html

https://www.jianshu.com/p/5cbe9f58dda7

一、集群和组件版本

K8S集群：1.19.8
Ceph集群：14.2.22
Ceph-CSI：tag v3.4.0

• 镜像版本：

docker pull registry.aliyuncs.com/it00021hot/cephcsi:v3.4.0
docker pull registry.aliyuncs.com/it00021hot/csi-provisioner:v2.2.2
docker pull registry.aliyuncs.com/it00021hot/csi-resizer:v1.2.0
docker pull registry.aliyuncs.com/it00021hot/csi-snapshotter:v4.1.1
docker pull registry.aliyuncs.com/it00021hot/csi-attacher:v3.2.1
docker pull registry.aliyuncs.com/it00021hot/csi-node-driver-registrar:v2.2.0

• ceph状态：

[root@k8s-master v3.4.0]# ceph -s
  cluster:
    id:     627227aa-4a5e-47c1-b822-28251f8a9936
    health: HEALTH_WARN
            2 pools have too many placement groups
            mons are allowing insecure global_id reclaim

  services:
    mon: 3 daemons, quorum k8s-master,k8s-node1,k8s-node2 (age 56m)
    mgr: k8s-node1(active, since 56m), standbys: k8s-node2, k8s-master
    mds: cephfs:1 {0=k8s-master=up:active}
    osd: 3 osds: 3 up (since 2h), 3 in (since 4d)

  data:
    pools:   2 pools, 256 pgs
    objects: 26 objects, 240 KiB
    usage:   3.2 GiB used, 27 GiB / 30 GiB avail
    pgs:     256 active+clean

[root@k8s-master v3.4.0]# ceph fs ls
name: cephfs, metadata pool: cephfs_metadata, data pools: [cephfs_data ]
[root@k8s-master v3.4.0]# ceph osd pool ls
cephfs_data
cephfs_metadata

二、部署

1、部署Ceph-CSI

git clone https://github.com/ceph/ceph-csi.git -b release-v3.4
cd ceph-csi/deploy/cephfs/kubernetes

2、修改yaml文件

# cat csi-config-map.yaml
---
apiVersion: v1
kind: ConfigMap
data:
  config.json: |-
    [
      {
       "clusterID": "627227aa-4a5e-47c1-b822-28251f8a9936",
       "monitors": [
          "192.168.130.141:6789",
          "192.168.130.142:6789",
          "192.168.130.143:6789"
       ],
       "cephFS": {
         "subvolumeGroup": "test"
       }
      }
    ]
metadata:
  name: ceph-csi-config

官方字段解释：  https://github.com/ceph/ceph-csi/blob/v3.4.0/examples/csi-config-map-sample.yaml

3、部署cephfs相关的CSI

# kubectl apply -f ceph-csi/deploy/cephfs/kubernetes/
# kubectl get pods | grep cephfs
csi-cephfsplugin-provisioner-b77cd56c9-4kdq8 6/6 Running 0 14m
csi-cephfsplugin-vgzrx 3/3 Running 0 14m
csi-cephfsplugin-zn7sg 3/3 Running 0 14m

三、kubernetes使用

1、创建连接ceph集群的秘钥

# cat csi-secret.yaml
---
apiVersion: v1
kind: Secret
metadata:
  name: csi-cephfs-secret
stringData:
  userID: admin
  userKey: AQAOns1hV041AhAAhEATG95ZS5kTL78mjNWEeA==
  adminID: admin
  adminKey: AQAOns1hV041AhAAhEATG95ZS5kTL78mjNWEeA==

2、创建storeclass

---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: csi-cephfs-sc
provisioner: cephfs.csi.ceph.com
parameters:
  clusterID: 627227aa-4a5e-47c1-b822-28251f8a9936
  fsName: cephfs
  pool: cephfs_data
  #  mounter: fuse       挂载方式
  csi.storage.k8s.io/provisioner-secret-name: csi-cephfs-secret
  csi.storage.k8s.io/provisioner-secret-namespace: default
  csi.storage.k8s.io/controller-expand-secret-name: csi-cephfs-secret
  csi.storage.k8s.io/controller-expand-secret-namespace: default
  csi.storage.k8s.io/node-stage-secret-name: csi-cephfs-secret
  csi.storage.k8s.io/node-stage-secret-namespace: default
reclaimPolicy: Delete
allowVolumeExpansion: true
mountOptions:
  - discard

官方参考： https://github.com/ceph/ceph-csi/blob/v3.4.0/examples/cephfs/storageclass.yaml

3、基于storeclass创建pvc

# cat pvc.yaml
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: data
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Gi
  storageClassName: csi-cephfs-sc

官方字段解释： https://github.com/ceph/ceph-csi/blob/v3.4.0/docs/deploy-cephfs.md