[libvirt-users] How to change libvirt / cgroup interaction?

[Kanabuchi]

Hi, Sam.

> How can I make this persistant? Is there a configuration file?

Libvirt may not have that configuration.
I think you can use "cgconfig" instead of it.

Setting as follows, in my environment was successful.

  1) edit /etc/cgconfig.conf
  # cpuset.cpus/mems is mandatory values.
  # Please set suitable values according to your environment.
  ----------
  group libvirt {
          cpuset {
                  cpuset.cpus = 0;
                  cpuset.mems = 0;
          }
  }

  group libvirt/lxc {
          cpuset {
                  cpuset.cpus = 0;
                  cpuset.mems = 0;
          } devices {
                  devices.allow = "c 10:200 rwm";
          }
  }

  mount {
          cpuset  = /cgroup/cpuset;
          cpu     = /cgroup/cpu;
          cpuacct = /cgroup/cpuacct;
          memory  = /cgroup/memory;
          devices = /cgroup/devices;
          freezer = /cgroup/freezer;
          net_cls = /cgroup/net_cls;
          blkio   = /cgroup/blkio;
  }
  ----------

  2) restart cgconfig and libvirtd.
     # Order is "libvirtd stop->cgconfig restart->libvirtd start"

  3) start lxc container.

Result in my environment(CentOS6.2 x86_64+libvirt 0.9.8) is

# virsh -c lxc:/// start lxc_container_1
Domain lxc_container_1 started

# cat /cgroup/devices/libvirt/lxc/lxc_container_1/devices.list
c 10:200 rwm <-- :-)
c 1:3 rwm
c 1:5 rwm
c 1:7 rwm
c 1:8 rwm
c 1:9 rwm
c 5:0 rwm
c 5:2 rwm
c 136:* rwm

Regards,
Mitsuru Kanabuchi

> -----Original Message-----
> From: libvirt-users-bounces at redhat.com [mailto:libvirt-users-bounces at redhat.com] On Behalf Of Samuel Hassine
> Sent: Wednesday, January 25, 2012 8:28 PM
> To: libvirt-users at redhat.com
> Subject: [libvirt-users] How to change libvirt / cgroup interaction?
> 
> Hi there,
> 
> Do you know if there is a way to modify how libvirt interacts with the cgroup?
> 
> Because, I successfully add the /dev/net/tun support in my LXC container by doing:
> 
> echo c 10:200 rwm >> /cgroup/libvirt/lxc/instance-00000005/devices.allow
> 
> But when I restart the instance/LXC container, this option has gone.
> 
> How can I make this persistant? Is there a configuration file?
> 
> Thanks for your answers.
> 
> Best regards.
> Sam
> 
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