[ceph-users] mount failed since failed to load ceph kernel module

Dai Xiang xiang.dai at sky-data.cn
Mon Nov 13 19:22:41 PST 2017


On Tue, Nov 14, 2017 at 02:24:06AM +0000, Linh Vu wrote:
> Your kernel is way too old for CephFS Luminous. I'd use one of the newer kernels from elrepo.org. :) We're on 4.12 here on RHEL 7.4.

There is still a question:
why on my host(3.10.0-327.el7.x86_64) cephfs can mount and load kernel
module normally?
Does it mean the docker's kernel must be above 4.12.* to enable
cephfs?

-- 
Best Regards
Dai Xiang
> 
> ________________________________
> From: ceph-users <ceph-users-bounces at lists.ceph.com> on behalf of xiang.dai at sky-data.cn <xiang.dai at sky-data.cn>
> Sent: Tuesday, 14 November 2017 1:13:47 PM
> To: ceph-users at lists.ceph.com
> Subject: [ceph-users] mount failed since failed to load ceph kernel module
> 
> Hi!
> 
> I got a confused issue in docker as below:
> 
> After install ceph successfully, i want to mount cephfs but failed:
> 
> [root at dbffa72704e4 ~]$ /bin/mount 172.17.0.4:/<http://172.17.0.4:/> /cephfs -t ceph -o name=admin,secretfile=/etc/ceph/admin.secret -v
> failed to load ceph kernel module (1)
> parsing options: rw,name=admin,secretfile=/etc/ceph/admin.secret
> mount error 5 = Input/output error
> 
> But ceph related kernel modules have existed:
> 
> [root at dbffa72704e4 ~]$ lsmod | grep ceph
> ceph                  327687  0
> libceph               287066  1 ceph
> dns_resolver           13140  2 nfsv4,libceph
> libcrc32c              12644  3 xfs,libceph,dm_persistent_data
> 
> Check the ceph state(i only set data disk for osd):
> 
> [root at dbffa72704e4 ~]$ ceph -s
>   cluster:
>     id:     20f51975-303e-446f-903f-04e1feaff7d0
>     health: HEALTH_WARN
>             Reduced data availability: 128 pgs inactive
>             Degraded data redundancy: 128 pgs unclean
> 
>   services:
>     mon: 2 daemons, quorum dbffa72704e4,5807d12f920e
>     mgr: dbffa72704e4(active), standbys: 5807d12f920e
>     mds: cephfs-1/1/1 up  {0=5807d12f920e=up:creating}, 1 up:standby
>     osd: 0 osds: 0 up, 0 in
> 
>   data:
>     pools:   2 pools, 128 pgs
>     objects: 0 objects, 0 bytes
>     usage:   0 kB used, 0 kB / 0 kB avail
>     pgs:     100.000% pgs unknown
>              128 unknown
> 
> [root at dbffa72704e4 ~]$ ceph version
> ceph version 12.2.1 (3e7492b9ada8bdc9a5cd0feafd42fbca27f9c38e) luminous (stable)
> 
> My container is based on centos:centos7.2.1511, kernel is 3e0728877e22 3.10.0-514.el7.x86_64.
> 
> I saw some ceph related images on docker hub so that i think above
> operation is ok, did i miss something important?
> 
> --
> Best Regards
> Dai Xiang



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