November 2011 - Users - libvirt List Archives

[libvirt-users] auto-set /cgroup/*/libvirt/qemu/<vm name>/ directory permissions on creation
by Ben Clay 02 Nov '11

02 Nov '11

Is there a way to automatically set the permissions of cgroups directories created by libvirt when a VM is launched? Although it looks like I can set permissions on top-level /cgroup directories via cgconfig.conf, the cgconfig.conf manpage says "Permissions are related only to enclosing control group and are not inherited by subgroups.". From this, I believe that when libvirt creates VMs, the new directories under /cgroup/*/libvirt/qemu/<vm name>/ will not receive the cgconfig.conf permissions. Where in the libvirt config can I set this? We need users other than root to write to specific subsystems. I can ask on the libcg mailing list as well, but I thought I'd try here first since libvirt is dynamically creating / destroying these groups. Thanks. Ben Clay <mailto:rbclay@ncsu.edu> rbclay(a)ncsu.edu

2 1

[libvirt-users] CentOS5: libvirtd filling up /var/lib/libvirt/qemu/save
by Ben Clay 02 Nov '11

02 Nov '11

How can I disable libvirtd from attempting to suspend VMs on poweroff / reboot? It is slowly filling up our /var/ filesystem with save points at /var/lib/libvirt/qemu/save/<vm name>.save, even though I'm not initiating any suspend or restore functionality. I checked /etc/libvirt/libvirtd.conf and /etc/libvirt/qemu.conf but could not find anything. This is CentOS 5 with libvirt 0.8.2-22 and kvm-83-239. Thanks. Ben Clay <mailto:rbclay@ncsu.edu> rbclay(a)ncsu.edu

2 1

[libvirt-users] Network filesystem pool mount options
by Joe Auty 01 Nov '11

01 Nov '11

Hello, What are the default NFS mount options used by libvirt's network filesystem pool storage management, and can these be modified? -- Joe Auty, NetMusician NetMusician helps musicians, bands and artists create beautiful, professional, custom designed, career-essential websites that are easy to maintain and to integrate with popular social networks. www.netmusician.org <http://www.netmusician.org> joe(a)netmusician.org <mailto:joe@netmusician.org>

1 0

[libvirt-users] Error on the site
by Alexander Biryukov 01 Nov '11

01 Nov '11

Good afternoon. I apologize for my English. Error on page: http://libvirt.org/formatdomain.html To be more precise in the line "<target *def*='hdc' bus='ide'/>" -- Biryukov Alexander ICQ: 467093457 Skype: reddog_gad

2 1

[libvirt-users] Hard limit for the cpu usage of a VM
by sethuraman subbiah 01 Nov '11

01 Nov '11

Hi , I was previously using xen and currently moved to KVM. I am using libvirt to manage these VMs. In den's credit scheduler , I had the ability to set a cap on the cpu usage for a VM. But I was not able to find a similar substitute in KVM. I find that we can use cgroups to provide shares for VM but that will be more like weight based and it doesn't set a hard cap for that VM. I tried using cpulimit but I find it inaccurate and we can give values only between 0-100. Thus, I think it cannot support multi core environments. Can any one suggest a method to set a hard limit on a VM's cpu usage? Thank you. - Regards, Sethuraman Subbiah Graduate Student - NC state University M.S in Computer Science

3 9