Hi all,
I am running Kubernetes on CoreOS and use rbd binary exctracted from
ceph/ceph-docker/config image to map images to CoreOS host. Everything works
just fine except when trying to unmap the volume. It doesn't unmap and gives
following error:
$ rbd showmapped
id pool image snap device
0 rbd dcops-db - /dev/rbd0
$ sudo rbd unmap /dev/rbd0
rbd: '/dev/rbd0' is not an rbd device
rbd: unmap failed: (22) Invalid argument
When I was running strace against rbd unmap command I found out that it fails
while trying to get stat of this file:
lstat("/sys/devices/rbd/0/0", 0x7ffdfdc13f10) = -1 ENOENT (No such file or
directory)
On other machine running ArchLinux instead of looking for either
/sys/devices/rbd/0/0 or /sys/devices/rbd/0/254 (which are values of minor and
major), rbd unmap looks for /sys/devices/rbd/0/minor and reads value from
there. And rbd unmap works as supposed.
CoreOS runs kernel 4.0.5 #2 SMP Fri Jul 10 06:25:01 UTC 2015 x86_64 Intel(R)
Xeon(R) CPU E5620 @ 2.40GHz GenuineIntel GNU/Linux
ArchLinux where rbd works runs kernel 4.1.3-1-ARCH #1 SMP PREEMPT Wed Jul 22
20:37:12 CEST 2015 x86_64 GNU/Linux
rbd version on both machines is the same
$ rbd --version
ceph version 0.94.2 (5fb85614ca8f354284c713a2f9c610860720bbf3)
What can I try to fix the unmap issue.
Thank you!
- Anton
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