在Kubernetes集群中运行有状态服务或应用总是不那么容易的。比如，之前我在项目中使用了CephRBD，虽然遇到过几次问题，但总体算是运行良好。但最近发现CephRBD无法满足跨节点挂载的需求，我只好另辟蹊径。由于CephFS和CephRBD师出同门，它自然成为了这次我首要考察的目标。这里将跨节点挂载CephFS的考察过程记录一下，一是备忘，二则也可以为其他有相似需求的朋友提供些资料。

一、CephRBD的问题

这里先提一嘴CephRBD的问题。最近项目中有这样的需求：让集群中的Pod共享外部分布式存储，即多个Pod共同挂载一份存储，实现存储共享，这样可大大简化系统设计和复杂性。之前CephRBD都是挂载到一个Pod中运行的，CephRBD是否支持多Pod同时挂载呢？官方文档中给出了否定的答案: 基于CephRBD的Persistent Volume仅支持两种accessmode：
ReadWriteOnce和ReadOnlyMany，不支持ReadWriteMany。这样对于有读写需求的Pod来说，一个CephRBD pv仅能被一个node挂载一次。

我们来验证一下这个“不幸的”事实。

我们首先创建一个测试用的image：foo1。这里我利用了项目里写的CephRBD API服务，也可通过ceph命令手工创建：

# curl -v  -H "Content-type: application/json" -X POST -d '{"kind": "Images","apiVersion": "v1", "metadata": {"name": "foo1", "capacity": 512} ' http://192.168.3.22:8080/api/v1/pools/rbd/images
... ...
{
  "errcode": 0,
  "errmsg": "ok"
}

# curl http://192.168.3.22:8080/api/v1/pools/rbd/images
{
  "Kind": "ImagesList",
  "APIVersion": "v1",
  "Items": [
    {
      "name": "foo1"
    }
  ]
}

利用下面文件创建pv和pvc：

//ceph-pv.yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: foo-pv
spec:
  capacity:
    storage: 512Mi
  accessModes:
    - ReadWriteMany
  rbd:
    monitors:
      - ceph_monitor_ip:port
    pool: rbd
    image: foo1
    user: admin
    secretRef:
      name: ceph-secret
    fsType: ext4
    readOnly: false
  persistentVolumeReclaimPolicy: Recycle

//ceph-pvc.yaml

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: foo-claim
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 512Mi

创建后：

# kubectl get pv
[NAME                CAPACITY   ACCESSMODES   RECLAIMPOLICY   STATUS    CLAIM                        REASON    AGE
foo-pv              512Mi      RWO           Recycle         Bound     default/foo-claim                      20h

# kubectl get pvc
NAME                 STATUS    VOLUME              CAPACITY   ACCESSMODES   AGE
foo-claim            Bound     foo-pv              512Mi      RWO           20h

创建挂载上述image的Pod：

// ceph-pod2.yaml

apiVersion: v1
kind: Pod
metadata:
  name: ceph-pod2
spec:
  containers:
  - name: ceph-ubuntu2
    image: ubuntu:14.04
    command: ["tail", "-f", "/var/log/bootstrap.log"]
    volumeMounts:
    - name: ceph-vol2
      mountPath: /mnt/cephrbd/data
      readOnly: false
  volumes:
  - name: ceph-vol2
    persistentVolumeClaim:
      claimName: foo-claim

创建成功后，我们可以查看挂载目录的数据：

# kubectl exec ceph-pod2 ls /mnt/cephrbd/data
1.txt
lost+found

我们在同一个kubernetes node上再启动一个pod（可以把上面的ceph-pod2.yaml的pod name改为ceph-pod3），挂载同样的pv：

NAMESPACE                    NAME                                    READY     STATUS    RESTARTS   AGE       IP             NODE
default                      ceph-pod2                               1/1       Running   0          3m        172.16.57.9    xx.xx.xx.xx
default                      ceph-pod3                               1/1       Running   0          0s        172.16.57.10    xx.xx.xx.xx

# kubectl exec ceph-pod3 ls /mnt/cephrbd/data
1.txt
lost+found

我们通过ceph-pod2写一个文件，在ceph-pod3中将其读出：

# kubectl exec ceph-pod2 -- bash -c "for i in {1..10}; do sleep 1; echo 'pod2: Hello, World'>> /mnt/cephrbd/data/foo.txt ; done "
root@node1:~/k8stest/k8s-cephrbd/footest# kubectl exec ceph-pod3 cat /mnt/cephrbd/data/foo.txt
pod2: Hello, World
pod2: Hello, World
pod2: Hello, World
pod2: Hello, World
pod2: Hello, World
pod2: Hello, World
pod2: Hello, World
pod2: Hello, World
pod2: Hello, World
pod2: Hello, World

到目前为止，在一个node上多个Pod是可以以ReadWrite模式挂载同一个CephRBD的。

我们在另外一个节点启动一个试图挂载该pv的Pod，该Pod启动后一直处于pending状态，通过kubectl describe查看其详细信息，可以看到：

Events:
  FirstSeen    LastSeen    Count    From            SubobjectPath    Type        Reason        Message
  ---------    --------    -----    ----            -------------    --------    ------        -------
.. ...
  2m        37s        2    {kubelet yy.yy.yy.yy}            Warning        FailedMount    Unable to mount volumes for pod "ceph-pod2-master_default(a45f62aa-2bc3-11e7-9baa-00163e1625a9)": timeout expired waiting for volumes to attach/mount for pod "ceph-pod2-master"/"default". list of unattached/unmounted volumes=[ceph-vol2]
  2m        37s        2    {kubelet yy.yy.yy.yy}            Warning        FailedSync    Error syncing pod, skipping: timeout expired waiting for volumes to attach/mount for pod "ceph-pod2-master"/"default". list of unattached/unmounted volumes=[ceph-vol2]

查看kubelet.log中的错误日志：

I0428 11:39:15.737729    1241 reconciler.go:294] MountVolume operation started for volume "kubernetes.io/rbd/a45f62aa-2bc3-11e7-9baa-00163e1625a9-foo-pv" (spec.Name: "foo-pv") to pod "a45f62aa-2bc3-11e7-9baa-00163e1625a9" (UID: "a45f62aa-2bc3-11e7-9baa-00163e1625a9").
I0428 11:39:15.939183    1241 operation_executor.go:768] MountVolume.SetUp succeeded for volume "kubernetes.io/secret/923700ff-12c2-11e7-9baa-00163e1625a9-default-token-40z0x" (spec.Name: "default-token-40z0x") pod "923700ff-12c2-11e7-9baa-00163e1625a9" (UID: "923700ff-12c2-11e7-9baa-00163e1625a9").
E0428 11:39:17.039656    1241 disk_manager.go:56] failed to attach disk
E0428 11:39:17.039722    1241 rbd.go:228] rbd: failed to setup mount /var/lib/kubelet/pods/a45f62aa-2bc3-11e7-9baa-00163e1625a9/volumes/kubernetes.io~rbd/foo-pv rbd: image foo1 is locked by other nodes
E0428 11:39:17.039857    1241 nestedpendingoperations.go:254] Operation for "\"kubernetes.io/rbd/a45f62aa-2bc3-11e7-9baa-00163e1625a9-foo-pv\" (\"a45f62aa-2bc3-11e7-9baa-00163e1625a9\")" failed. No retries permitted until 2017-04-28 11:41:17.039803969 +0800 CST (durationBeforeRetry 2m0s). Error: MountVolume.SetUp failed for volume "kubernetes.io/rbd/a45f62aa-2bc3-11e7-9baa-00163e1625a9-foo-pv" (spec.Name: "foo-pv") pod "a45f62aa-2bc3-11e7-9baa-00163e1625a9" (UID: "a45f62aa-2bc3-11e7-9baa-00163e1625a9") with: rbd: image foo1 is locked by other nodes

可以看到“rbd: image foo1 is locked by other nodes”的日志。我们用试验证明了目前CephRBD仅能被k8s中的一个node挂载的事实。

二、Ceph集群安装mds以支持CephFS

这次我在两个Ubuntu 16.04的vm上新部署了一套Ceph，过程与之前第一次部署Ceph时大同小异，这里就不赘述了。要让Ceph支持CephFS，我们需要安装mds组件，有了前面的基础，通过ceph-deploy工具安装mds十分简单：

# ceph-deploy mds create yypdmaster yypdnode
[ceph_deploy.conf][DEBUG ] found configuration file at: /root/.cephdeploy.conf
[ceph_deploy.cli][INFO  ] Invoked (1.5.37): /usr/bin/ceph-deploy mds create yypdmaster yypdnode
[ceph_deploy.cli][INFO  ] ceph-deploy options:
[ceph_deploy.cli][INFO  ]  username                      : None
[ceph_deploy.cli][INFO  ]  verbose                       : False
[ceph_deploy.cli][INFO  ]  overwrite_conf                : False
[ceph_deploy.cli][INFO  ]  subcommand                    : create
[ceph_deploy.cli][INFO  ]  quiet                         : False
[ceph_deploy.cli][INFO  ]  cd_conf                       : <ceph_deploy.conf.cephdeploy.Conf instance at 0x7f60fb5e71b8>
[ceph_deploy.cli][INFO  ]  cluster                       : ceph
[ceph_deploy.cli][INFO  ]  func                          : <function mds at 0x7f60fba4e140>
[ceph_deploy.cli][INFO  ]  ceph_conf                     : None
[ceph_deploy.cli][INFO  ]  mds                           : [('yypdmaster', 'yypdmaster'), ('yypdnode', 'yypdnode')]
[ceph_deploy.cli][INFO  ]  default_release               : False
[ceph_deploy.mds][DEBUG ] Deploying mds, cluster ceph hosts yypdmaster:yypdmaster yypdnode:yypdnode
[yypdmaster][DEBUG ] connected to host: yypdmaster
[yypdmaster][DEBUG ] detect platform information from remote host
[yypdmaster][DEBUG ] detect machine type
[ceph_deploy.mds][INFO  ] Distro info: Ubuntu 16.04 xenial
[ceph_deploy.mds][DEBUG ] remote host will use systemd
[ceph_deploy.mds][DEBUG ] deploying mds bootstrap to yypdmaster
[yypdmaster][DEBUG ] write cluster configuration to /etc/ceph/{cluster}.conf
[yypdmaster][DEBUG ] create path if it doesn't exist
[yypdmaster][INFO  ] Running command: ceph --cluster ceph --name client.bootstrap-mds --keyring /var/lib/ceph/bootstrap-mds/ceph.keyring auth get-or-create mds.yypdmaster osd allow rwx mds allow mon allow profile mds -o /var/lib/ceph/mds/ceph-yypdmaster/keyring
[yypdmaster][INFO  ] Running command: systemctl enable ceph-mds@yypdmaster
[yypdmaster][WARNIN] Created symlink from /etc/systemd/system/ceph-mds.target.wants/ceph-mds@yypdmaster.service to /lib/systemd/system/ceph-mds@.service.
[yypdmaster][INFO  ] Running command: systemctl start ceph-mds@yypdmaster
[yypdmaster][INFO  ] Running command: systemctl enable ceph.target
[yypdnode][DEBUG ] connected to host: yypdnode
[yypdnode][DEBUG ] detect platform information from remote host
[yypdnode][DEBUG ] detect machine type
[ceph_deploy.mds][INFO  ] Distro info: Ubuntu 16.04 xenial
[ceph_deploy.mds][DEBUG ] remote host will use systemd
[ceph_deploy.mds][DEBUG ] deploying mds bootstrap to yypdnode
[yypdnode][DEBUG ] write cluster configuration to /etc/ceph/{cluster}.conf
[yypdnode][DEBUG ] create path if it doesn't exist
[yypdnode][INFO  ] Running command: ceph --cluster ceph --name client.bootstrap-mds --keyring /var/lib/ceph/bootstrap-mds/ceph.keyring auth get-or-create mds.yypdnode osd allow rwx mds allow mon allow profile mds -o /var/lib/ceph/mds/ceph-yypdnode/keyring
[yypdnode][INFO  ] Running command: systemctl enable ceph-mds@yypdnode
[yypdnode][WARNIN] Created symlink from /etc/systemd/system/ceph-mds.target.wants/ceph-mds@yypdnode.service to /lib/systemd/system/ceph-mds@.service.
[yypdnode][INFO  ] Running command: systemctl start ceph-mds@yypdnode
[yypdnode][INFO  ] Running command: systemctl enable ceph.target

非常顺利。安装后，可以在任意一个node上看到mds在运行：

# ps -ef|grep ceph
ceph      7967     1  0 17:23 ?        00:00:00 /usr/bin/ceph-osd -f --cluster ceph --id 1 --setuser ceph --setgroup ceph
ceph     15674     1  0 17:32 ?        00:00:00 /usr/bin/ceph-mon -f --cluster ceph --id yypdnode --setuser ceph --setgroup ceph
ceph     18019     1  0 17:35 ?        00:00:00 /usr/bin/ceph-mds -f --cluster ceph --id yypdnode --setuser ceph --setgroup ceph

mds是存储cephfs的元信息的，我的ceph是10.2.7版本：

# ceph -v
ceph version 10.2.7 (50e863e0f4bc8f4b9e31156de690d765af245185)

虽然支持多 active mds并行运行，但官方文档建议保持一个active mds，其他mds作为standby(见下面ceph集群信息中的fsmap部分)：

# ceph -s
    cluster ffac3489-d678-4caf-ada2-3dd0743158b6
    ... ...
      fsmap e6: 1/1/1 up {0=yypdnode=up:active}, 1 up:standby
     osdmap e19: 2 osds: 2 up, 2 in
            flags sortbitwise,require_jewel_osds
      pgmap v192498: 576 pgs, 5 pools, 126 MB data, 238 objects
            44365 MB used, 31881 MB / 80374 MB avail
                 576 active+clean

三、创建fs并测试挂载

我们在ceph上创建一个fs：

# ceph osd pool create cephfs_data 128
pool 'cephfs_data' created

# ceph osd pool create cephfs_metadata 128
pool 'cephfs_metadata' created

# ceph fs new test_fs cephfs_metadata cephfs_data
new fs with metadata pool 2 and data pool 1

# ceph fs ls
name: test_fs, metadata pool: cephfs_metadata, data pools: [cephfs_data ]

不过，ceph当前正式版功能中仅支持一个fs，对多个fs的支持仅存在于实验feature中：

# ceph osd pool create cephfs1_data 128
# ceph osd pool create cephfs1_metadata 128
# ceph fs new test_fs1 cephfs1_metadata cephfs1_data
Error EINVAL: Creation of multiple filesystems is disabled.  To enable this experimental feature, use 'ceph fs flag set enable_multiple true'

在物理机上挂载cephfs可以使用mount命令、mount.ceph(apt-get install ceph-fs-common)或ceph-fuse(apt-get install ceph-fuse)，我们先用mount命令挂载：

我们将上面创建的cephfs挂载到主机的/mnt下：

#mount -t ceph ceph_mon_host:6789:/ /mnt -o name=admin,secretfile=admin.secret

# cat admin.secret //ceph.client.admin.keyring中的key
AQDITghZD+c/DhAArOiWWQqyMAkMJbWmHaxjgQ==

查看cephfs信息：

# df -h
ceph_mon_host:6789:/   79G   45G   35G  57% /mnt

可以看出：cephfs将两个物理节点上的磁盘全部空间作为了自己的空间。

通过ceph-fuse挂载，还可以限制对挂载路径的访问权限，我们来创建用户foo，让其仅仅拥有对/ceph-volume1-test路径具有只读访问权限：

# ceph auth get-or-create client.foo mon 'allow *' mds 'allow r path=/ceph-volume1-test' osd 'allow *'
# ceph-fuse -n client.foo -m 10.47.217.91:6789 /mnt -r /ceph-volume1-test
ceph-fuse[10565]: starting ceph client2017-05-03 16:07:25.958903 7f1a14fbff00 -1 init, newargv = 0x557e350defc0 newargc=11
ceph-fuse[10565]: starting fuse

查看挂载路径，并尝试创建文件：

# cd /mnt
root@yypdnode:/mnt# ls
1.txt
root@yypdnode:/mnt# touch 2.txt
touch: cannot touch '2.txt': Permission denied

由于foo用户只拥有对 /ceph-volume1-test的只读权限，因此创建文件失败了！

四、Kubernetes跨节点挂载CephFS

在K8s中，至少可以通过两种方式挂载CephFS，一种是通过Pod直接挂载；另外一种则是通过pv和pvc挂载。我们分别来看。

1、Pod直接挂载CephFS

//ceph-pod2-with-secret.yaml
apiVersion: v1
kind: Pod
metadata:
  name: ceph-pod2-with-secret
spec:
  containers:
  - name: ceph-ubuntu2
    image: ubuntu:14.04
    command: ["tail", "-f", "/var/log/bootstrap.log"]
    volumeMounts:
    - name: ceph-vol2
      mountPath: /mnt/cephfs/data
      readOnly: false
  volumes:
  - name: ceph-vol2
    cephfs:
      monitors:
      - ceph_mon_host:6789
      user: admin
      secretFile: "/etc/ceph/admin.secret"
      readOnly: false

注意：保证每个节点上都存在/etc/ceph/admin.secret文件。

查看Pod挂载的内容：

# docker ps|grep pod
bc96431408c7        ubuntu:14.04                                                  "tail -f /var/log/boo"   About a minute ago   Up About a minute                                                                        k8s_ceph-ubuntu2.66c44128_ceph-pod2-with-secret_default_3d8a05f8-33c3-11e7-bcd9-6640d35a0e90_fc483b8a
bcc65ab82069        gcr.io/google_containers/pause-amd64:3.0                      "/pause"                 About a minute ago   Up About a minute                                                                        k8s_POD.d8dbe16c_ceph-pod2-with-secret_default_3d8a05f8-33c3-11e7-bcd9-6640d35a0e90_02381204

root@yypdnode:~# docker exec bc96431408c7 ls /mnt/cephfs/data
1.txt
apps
ceph-volume1-test
test1.txt

我们再在另外一个node上启动挂载同一个cephfs的Pod，看是否可以跨节点挂载：

# kubectl get pods

NAMESPACE                    NAME                                    READY     STATUS    RESTARTS   AGE       IP             NODE
default                      ceph-pod2-with-secret                   1/1       Running   0          3m        172.30.192.2   iz2ze39jeyizepdxhwqci6z
default                      ceph-pod2-with-secret-on-master         1/1       Running   0          3s        172.30.0.51    iz25beglnhtz
... ...

# kubectl exec ceph-pod2-with-secret-on-master ls /mnt/cephfs/data
1.txt
apps
ceph-volume1-test
test1.txt

可以看到不同节点可以挂载同一CephFS。我们在一个pod中操作一下挂载的cephfs：

# kubectl exec ceph-pod2-with-secret-on-master -- bash -c "for i in {1..10}; do sleep 1; echo 'pod2-with-secret-on-master: Hello, World'>> /mnt/cephfs/data/foo.txt ; done "
root@yypdmaster:~/k8stest/cephfstest/footest# kubectl exec ceph-pod2-with-secret-on-master cat /mnt/cephfs/data/foo.txt
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World

2、通过PV和PVC挂载CephFS

挂载cephfs的pv和pvc在写法方面与上面挂载rbd的类似：

//ceph-pv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
  name: foo-pv
spec:
  capacity:
    storage: 512Mi
  accessModes:
    - ReadWriteMany
  cephfs:
    monitors:
      - ceph_mon_host:6789
    path: /
    user: admin
    secretRef:
      name: ceph-secret
    readOnly: false
  persistentVolumeReclaimPolicy: Recycle

//ceph-pvc.yaml

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: foo-claim
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 512Mi

使用pvc的pod:

//ceph-pod2.yaml
apiVersion: v1
kind: Pod
metadata:
  name: ceph-pod2
spec:
  containers:
  - name: ceph-ubuntu2
    image: ubuntu:14.04
    command: ["tail", "-f", "/var/log/bootstrap.log"]
    volumeMounts:
    - name: ceph-vol2
      mountPath: /mnt/cephfs/data
      readOnly: false
  volumes:
  - name: ceph-vol2
    persistentVolumeClaim:
      claimName: foo-claim

创建pv、pvc：

# kubectl create -f ceph-pv.yaml
persistentvolume "foo-pv" created
# kubectl create -f ceph-pvc.yaml
persistentvolumeclaim "foo-claim" created

# kubectl get pvc
NAME        STATUS    VOLUME    CAPACITY   ACCESSMODES   AGE
foo-claim   Bound     foo-pv    512Mi      RWX           4s
# kubectl get pv
NAME      CAPACITY   ACCESSMODES   RECLAIMPOLICY   STATUS    CLAIM               REASON    AGE
foo-pv    512Mi      RWX           Recycle         Bound     default/foo-claim             24s

启动pod，通过exec命令查看挂载情况：

# docker ps|grep pod
a6895ec0274f        ubuntu:14.04                                                  "tail -f /var/log/boo"   About a minute ago   Up About a minute                                                                        k8s_ceph-ubuntu2.66c44128_ceph-pod2_default_4e4fc8d4-33c6-11e7-bcd9-6640d35a0e90_1b37ed76
52b6811a6584        gcr.io/google_containers/pause-amd64:3.0                      "/pause"                 About a minute ago   Up About a minute                                                                        k8s_POD.d8dbe16c_ceph-pod2_default_4e4fc8d4-33c6-11e7-bcd9-6640d35a0e90_27e5f988
55b96edbf4bf        ubuntu:14.04                                                  "tail -f /var/log/boo"   14 minutes ago       Up 14 minutes                                                                            k8s_ceph-ubuntu2.66c44128_ceph-pod2-with-secret_default_9d383b0c-33c4-11e7-bcd9-6640d35a0e90_1656e5e0
f8b699bc0459        gcr.io/google_containers/pause-amd64:3.0                      "/pause"                 14 minutes ago       Up 14 minutes                                                                            k8s_POD.d8dbe16c_ceph-pod2-with-secret_default_9d383b0c-33c4-11e7-bcd9-6640d35a0e90_effdfae7
root@yypdnode:~# docker exec a6895ec0274f ls /mnt/cephfs/data
1.txt
apps
ceph-volume1-test
foo.txt
test1.txt

# docker exec a6895ec0274f cat /mnt/cephfs/data/foo.txt
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World
pod2-with-secret-on-master: Hello, World

五、pv的状态

如果你不删除pvc，一切都安然无事：

# kubectl get pv
NAME                CAPACITY   ACCESSMODES   RECLAIMPOLICY   STATUS    CLAIM                        REASON    AGE
foo-pv              512Mi      RWX           Recycle         Bound     default/foo-claim                      1h

# kubectl get pvc
NAME                 STATUS    VOLUME              CAPACITY   ACCESSMODES   AGE
foo-claim            Bound     foo-pv              512Mi      RWX           1h

但是如果删除pvc，pv的状态将变成failed：

删除pvc：

# kubectl get pv
NAME                CAPACITY   ACCESSMODES   RECLAIMPOLICY   STATUS    CLAIM                        REASON    AGE
foo-pv              512Mi      RWX           Recycle         Failed    default/foo-claim                      2h

# kubectl describe pv/foo-pv
Name:        foo-pv
Labels:        <none>
Status:        Failed
Claim:        default/foo-claim
Reclaim Policy:    Recycle
Access Modes:    RWX
Capacity:    512Mi
Message:    No recycler plugin found for the volume!
Source:
    Type:        RBD (a Rados Block Device mount on the host that shares a pod's lifetime)
    CephMonitors:    [xx.xx.xx.xx:6789]
    RBDImage:        foo1
    FSType:        ext4
    RBDPool:        rbd
    RadosUser:        admin
    Keyring:        /etc/ceph/keyring
    SecretRef:        &{ceph-secret}
    ReadOnly:        false
Events:
  FirstSeen    LastSeen    Count    From                SubobjectPath    Type        Reason            Message
  ---------    --------    -----    ----                -------------    --------    ------            -------
  29s        29s        1    {persistentvolume-controller }            Warning        VolumeFailedRecycle    No recycler plugin found for the volume!

我们在pv中指定的persistentVolumeReclaimPolicy是Recycle，但无论是cephrbd还是cephfs都不没有对应的recycler plugin，导致pv的status变成了failed，只能手工删除重建。

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