On Tue, Aug 30, 2016 at 8:53 AM, Deneau, Tom <tom.deneau@xxxxxxx> wrote: > So in my case what would $name be? OK. To begin with just hard code a consistent name. /var/log/ceph/rbd.log Use that in the conf file, touch it and chmod it then restart you qemu instance (don't just restart the VM). > > -- Tom > >> -----Original Message----- >> From: Brad Hubbard [mailto:bhubbard@xxxxxxxxxx] >> Sent: Monday, August 29, 2016 5:29 PM >> To: Mykola Golub <mgolub@xxxxxxxxxxxx> >> Cc: Deneau, Tom <tom.deneau@xxxxxxx>; ceph-devel@xxxxxxxxxxxxxxx >> Subject: Re: debugging librbd to a VM >> >> On Mon, Aug 29, 2016 at 6:03 PM, Mykola Golub <mgolub@xxxxxxxxxxxx> wrote: >> > May be qemu does not see you ceph.conf? Or some other environmental >> > issue (e.g. with qemu rbd driver). Try >> > >> > ldd /usr/bin/qemu-system-x86_64 |grep rbd >> > >> > Have you tried starting it from command line? >> > >> > You could check if config debug options work as expected setting them >> > on your working cluster. >> >> You can also try "touch /tmp/cbt/ceph/log/$name.log" and "chmod 777 >> /tmp/cbt/ceph/log/$name.log" to eliminate permissions issues. >> >> > >> > On Fri, Aug 26, 2016 at 09:08:30PM +0000, Deneau, Tom wrote: >> >> I have two small clusters configured with the same version of Ceph and >> the same OS version. >> >> (different processor hardware) >> >> >> >> On these clusters I have bootable RBD images that I expect a VM to boot >> from. >> >> On one cluster, the VM does not boot from the image. On the other >> cluster, it boots fine. >> >> On the failing cluster, a VM can boot fine from the base qcow2 image >> from which the rbd image was created. It's only rbd images that are >> causing problems for the VM. >> >> >> >> I would like to enable some debug logging that could tell where the two >> clusters are diverging. >> >> >> >> I tried adding >> >> debug rbd = 20 >> >> log file = /tmp/cbt/ceph/log/$name.log >> >> >> >> I do see some rbd debug messages to stderr during operations like rbd >> clone, etc. but I don't see any log files created in /tmp/cbt/ceph or >> /var/log/ceph or any messages when librbd is being used by say qemu-img >> convert, or by qemu-kvm. >> >> >> >> Is there a way to see detailed debug messages for librbd? >> >> >> >> Or is there a better way to see where things are diverging between >> these two clusters? >> >> (note: I tried lttng but could not get it to record anything) >> >> >> >> -- Tom >> >> -- >> >> To unsubscribe from this list: send the line "unsubscribe ceph-devel" >> >> in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo >> >> info at http://vger.kernel.org/majordomo-info.html >> > >> > -- >> > Mykola Golub >> > -- >> > To unsubscribe from this list: send the line "unsubscribe ceph-devel" >> > in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo >> > info at http://vger.kernel.org/majordomo-info.html >> >> >> >> -- >> Cheers, >> Brad -- Cheers, Brad -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
