Re: [libvirt-users] getCPUStats of a domain by a non-root user - libvirtError: Requested operation is not valid: cgroup CPUACCT controller is not mounted

21 Aug 2012

      Hi All,

Unfortunately, I couldn't manage to solve my problem.  I've tried various
way to configure Cgroups  to enable VM monitoring by a non-root user with
no luck. My current /etc/cgconfig.conf is the following:

group sysdefault {
       perm {
               task {
                       uid = anton;
                       gid = root;
               }
               admin {
                       uid = anton;
                       gid = root;
               }
       }
}

mount {
       cpuacct = /mnt/cgroups/cpuacct;
}

Where "anton" is a non-root user. However, this doesn't work. Here is a
simple test:

$ virsh start cirros
$ virsh cpu-stats cirros
error: Failed to virDomainGetCPUStats()
error: Requested operation is not valid: cgroup CPUACCT controller is not
mounted

Where cirros is a VM image. Everything is fine for the root user:

$ sudo virsh start cirros
$ sudo virsh cpu-stats cirros
CPU0:
cpu_time             0.025812184 seconds
 vcpu_time            0.025812184 seconds
CPU1:
cpu_time             4.893484927 seconds
 vcpu_time            4.893484927 seconds
Total:
cpu_time             4.924620941 seconds
 user_time            1.060000000 seconds
system_time          3.050000000 seconds

I would be very grateful to get any suggestions from anyone.

Thanks,
Anton

On Sat, Aug 18, 2012 at 4:07 PM, Anton Beloglazov <
anton.beloglazov@gmail.com> wrote:
...
Hi Olivier,
Thanks for the links. I see now that there is an option to assign
permissions to access control groups for non-root users. I'll try to
configure it and post back the results.
Best regards,
Anton
On Fri, Aug 17, 2012 at 11:31 PM, Anton Beloglazov <
anton.beloglazov@gmail.com> wrote:
...
Hi Olivier,
Thanks for the suggestion, but Cgroups is installed and started. As I
mentioned, everything works for the root user. Should I do some special
configuration for a non-root user? Currently, my /etc/cgconfig.conf
contains the following:
mount {
cpuacct = /mnt/cgroups/cpuacct;
}
Thanks,
Anton
On Fri, Aug 17, 2012 at 11:24 PM, Olivier Doucet <webmaster@ajeux.com>wrote:
...
Hi,
...
libvir: QEMU Driver error : Requested operation is not valid: cgroup
CPUACCT
controller is not mounted
You need to install/configure Cgroups on your system :
http://en.wikipedia.org/wiki/Cgroups
https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6/ht...
Olivier