关于ceph的一些问题及解决

fablefe

　　1.问题:
# ceph health
HEALTH_WARN application not enabled on 1 pool(s)　　解决:
# ceph health detail
HEALTH_WARN application not enabled on 1 pool(s)
POOL_APP_NOT_ENABLED application not enabled on 1 pool(s)
    application not enabled on pool 'kube'
    use 'ceph osd pool application enable  ', where  is 'cephfs', 'rbd', 'rgw', or freeform for custom applications.
# ceph osd pool application enable kube rbd
enabled application 'rbd' on pool 'kube'
# ceph health
HEALTH_OK　　2.问题:
# ceph -s
  cluster:
    id:     e781a2e4-097d-4867-858d-bdbd3a264435
    health: HEALTH_WARN
            clock skew detected on mon.ceph02, mon.ceph03　　

　　解决:

####确认NTP服务是否正常工作
# systemctl status ntpd
####修改ceph配置中的时间偏差阈值
# vim /etc/ceph/ceph.conf
###在global字段下添加:
mon clock drift allowed = 2
mon clock drift warn backoff = 30   
####向需要同步的mon节点推送配置文件
# cd /etc/ceph/
# ceph-deploy --overwrite-conf config  push ceph{01..03}
####重启mon服务并验证
# systemctl restart ceph-mon.target
# ceph -s
  cluster:
    id:     e781a2e4-097d-4867-858d-bdbd3a264435
    health: HEALTH_OK　　3.问题:
# rbd map abc/zhijian --id admin
rbd: sysfs write failed
RBD image feature set mismatch. Try disabling features unsupported by the kernel with "rbd feature disable".
In some cases useful info is found in syslog - try "dmesg | tail".
rbd: map failed: (6) No such device or address　　

　　解决:
　　由于kernel不支持块设备镜像的一些特性，所以映射失败
# rbd feature disable abc/zhijian exclusive-lock, object-map, fast-diff, deep-flatten
# rbd info abc/zhijian
rbd image 'zhijian':
size 1024 MB in 256 objects
order 22 (4096 kB objects)
block_name_prefix: rbd_data.1011074b0dc51
format: 2
features: layering
flags:
create_timestamp: Sun May  6 13:35:21 2018
# rbd map abc/zhijian --id admin
/dev/rbd0　　4.问题:
# ceph osd pool delete cephfs_data
Error EPERM: WARNING: this will *PERMANENTLY DESTROY* all data stored in pool cephfs_data.  If you are *ABSOLUTELY CERTAIN* that is what you want, pass the pool name *twice*, followed by --yes-i-really-really-mean-it.
# ceph osd pool delete cephfs_data cephfs_data --yes-i-really-really-mean-it
Error EPERM: pool deletion is disabled; you must first set the mon_allow_pool_delete config option to true before you can destroy a pool　　

　　解决:
# tail -n 2 /etc/ceph/ceph.conf
[mon]
mon allow pool delete = true　　向需要同步的mon节点推送配置文件:
# cd /etc/ceph/
# ceph-deploy --overwrite-conf config  push ceph{01..03}　　

　　重启mon服务并验证:
# systemctl restart ceph-mon.target
# ceph osd pool delete cephfs_data cephfs_data --yes-i-really-really-mean-it
pool 'cephfs_data' removed　　5.问题:
# ceph osd pool rm cephfs_data cephfs_data --yes-i-really-really-mean-it
Error EBUSY: pool 'cephfs_data' is in use by CephFS　　

　　解决:
# ceph fs ls
name: cephfs, metadata pool: cephfs_metadata, data pools: [cephfs_data ]
#  ceph fs rm cephfs --yes-i-really-mean-it
Error EINVAL: all MDS daemons must be inactive before removing filesystem
# systemctl stop ceph-mds.target
# ceph fs rm cephfs
Error EPERM: this is a DESTRUCTIVE operation and will make data in your filesystem permanently inaccessible.  Add --yes-i-really-mean-it if you are sure you wish to continue.
# ceph fs rm cephfs --yes-i-really-mean-it
# ceph fs ls
No filesystems enabled　　6.问题:
　　使用静态PV创建pod，pod一直处于ContainerCreating状态:
# kubectl get pod ceph-pod1
NAME        READY     STATUS              RESTARTS   AGE
ceph-pod1   0/1       ContainerCreating   0          10s
......
# kubectl describe pod ceph-pod1
Warning  FailedMount             41s (x8 over 1m)  kubelet, node01            MountVolume.WaitForAttach failed for volume "ceph-pv" : fail to check rbd image status with: (executable file not found in $PATH), rbd output: ()
Warning  FailedMount             0s                kubelet, node01            Unable to mount volumes for pod "ceph-pod1_default(14e3a07d-93a8-11e8-95f6-000c29b1ec26)": timeout expired waiting for volumes to attach or mount for pod "default"/"ceph-pod1". list of unmounted volumes=[ceph-vol1]. list of unattached volumes=[ceph-vol1 default-token-v9flt]　　解决:node节点安装最新版的ceph-common解决该问题，ceph集群使用的是最新的mimic版本，而base源的版本太陈旧，故出现该问题
　　7.问题:
　　创建动态PV，PVC一直处于pending状态:
# kubectl get pvc -n ceph
NAME       STATUS   VOLUME  CAPACITY  ACCESS MODES  STORAGECLASS  AGE
ceph-pvc   Pending                                     ceph-rbd    2m
# kubectl describe pvc -n ceph
......
Warning  ProvisioningFailed  27s   persistentvolume-controller  Failed to provision volume with StorageClass "ceph-rbd": failed to create rbd image: exit status 1, command output: 2018-07-31 11:10:33.395991 7faa3558b7c0 -1 did not load config file, using default settings.
rbd: extraneous parameter --image-feature　　解决:

　　persistentvolume-controller 服务运行在master节点，受kube-controller-manager 控制，故master节点也需要安装ceph-common包