On 07/06/2013 04:51 AM, Xue, Chendi wrote:
Hi, all
I wanna fetch debug librbd and debug rbd logs when I am using vm to read / write.
Details:
I created a volume from ceph and attached it to a vm.
So I suppose when I do read/write in the VM, I can get some rbd debug logs in the host where the vm lies in.
But in fact, after everything I can try, I still cannot get those logs.
Below is the configuration on qemu side
;global
[global]
; allow ourselves to open a lot of files
max open files = 131072
auth cluster required = none
auth service required = none
auth client required = none
; set log file
log file = /var/log/ceph/$name.log
; set up pid files
pid file = /var/run/ceph/$name.pid
;client
[client]
rbd cache = true
rbd cache size = 21474836480
rbd cache max dirty = 0
; set qemu log file
log file = /var/log/ceph/ceph.client.log
# debug ms = 1
# debug client = 20
debug rbd = 20
debug librbd = 20
debug objectcacher = 20
; monitors
; You need at least one. You need at least three if you want to
; tolerate any node failures. Always create an odd number.
[mon]
mon data = /data/$name
[mon.Ceph-N3]
host = node3
mon addr = 192.168.1.13:6789
This configuration is fine.
Something I tried:
I do can fetch librbd logs when using rbd command like "rbd list pool_name" and " rbd -p pool_name bench-write image_name --io-size 4096 --io-threads 1 --io-total 4096 --io-pattern rand"
But if I using dd in vm to the virtual volume created by ceph, there is still no rbd debug logs.
Can the unix user running qemu write to /var/log/ceph to create
/var/log/ceph/ceph.client.log?
SELinux or apparmor may be preventing it, if not usual unix permissions.
Josh
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