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porcupie / rbd-docker-plugin

Ceph RBD docker volume driver plugin.
MIT License
9 stars 13 forks source link

Is Exclusive Lock really needed? Do you use it? #10

Closed etamponi closed 8 years ago

etamponi commented 8 years ago

To be able to mount rbd volumes, I needed to set rbd default features = 3, that is, I had to disable exclusive locking. This makes the plugin work, but when I check in the logs I see that it complains about not being able of taking the lock on the volume:

2016/09/05 20:10:49 driver.go:360: INFO: API Mount({welcome 8e79f14fca1ae71f2f84e707a15a173d9f5b77afa64a3824d31dc55ec061a327})
2016/09/05 20:10:49 driver.go:384: ERROR: locking RBD Image(welcome): exit status 16
2016/09/05 20:10:49 driver.go:568: INFO: API Unmount({welcome })
2016/09/05 20:10:49 driver.go:612: ERROR: unmounting device(/dev/rbd0): exit status 32

So my question is: I didn't see any reference to disabling the exclusive lock in the README, so I assume that your kernel works fine!

Which version of Ceph do you use? And which kernel?

# ceph --version
ceph version 10.2.2 (45107e21c568dd033c2f0a3107dec8f0b0e58374)
# uname -a
Linux ubuntu 4.4.8 #2 SMP Tue Jun 7 12:10:44 AEST 2016 x86_64 x86_64 x86_64 GNU/Linux
porcupie commented 8 years ago

Yes we do use exclusive Ceph RBD locks. We tend not to rely on latest of anything, or we're slow on uptake anyway: CentOS 7.x, kernel 3.10.x, Docker 1.9, Ceph 0.94.8

etamponi commented 8 years ago

As I expected! Thanks! Too bad, ceph-deploy does not work anymore to install Ceph Hammer on Ubuntu because of a packaging issue. I will try to install Ceph manually.

Il 06 set 2016 1:23 AM, "Damian Martinez" notifications@github.com ha scritto:

We tend not to rely on latest of anything: CentOS 7.x, kernel 3.10.x, Docker 1.9, Ceph 0.94.8

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/porcupie/rbd-docker-plugin/issues/10#issuecomment-244820914, or mute the thread https://github.com/notifications/unsubscribe-auth/AAjUNP0lMITgpwYLJ8LS5ZsIWcB9sKQYks5qnKR9gaJpZM4J1Tmn .

etamponi commented 8 years ago

Ok, it was an issue with my code, and the errors were actually lecit. I am gonna close this.