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

[Anton Beloglazov <anton.beloglazov@xxxxxxxxx>]

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@xxxxxxxxx> 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@xxxxxxxxx> 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@xxxxxxxxx> 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/html/Resource_Management_Guide/ch01.html

Olivier

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