[Pkg-libvirt-maintainers] Bug#725261: libvirt-bin: Cgroup configuration for LXC and Qemu on the same host
Manuel VIVES
manuel.vives at diateam.net
Thu Oct 3 12:45:17 UTC 2013
Package: libvirt-bin
Version: 1.1.2-3hns1
Severity: wishlist
Dear Maintainer,
I'm using libvirt for managing LXC containers and Qemu/KVM vms on the same host
and I was having trouble doing this, because of the common mountpoint of
my cgroups (they were all mounted in /sys/fs/cgroup), so I asked on
#virt and I've been told to use this kind of configuration for the cgroups:
"cgroup_root on /sys/fs/cgroup type tmpfs (rw,relatime)
cgroup_cpuset on /sys/fs/cgroup/cpuset type cgroup
(rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup_cpu on /sys/fs/cgroup/cpu type cgroup
(rw,nosuid,nodev,noexec,relatime,cpu)
cgroup_cpuacct on /sys/fs/cgroup/cpuacct type cgroup
(rw,nosuid,nodev,noexec,relatime,cpuacct)
cgroup_memory on /sys/fs/cgroup/memory type cgroup
(rw,nosuid,nodev,noexec,relatime,memory)
cgroup_devices on /sys/fs/cgroup/devices type cgroup
(rw,nosuid,nodev,noexec,relatime,devices)
cgroup_freezer on /sys/fs/cgroup/freezer type cgroup
(rw,nosuid,nodev,noexec,relatime,freezer)
cgroup_net_cls on /sys/fs/cgroup/net_cls type cgroup
(rw,nosuid,nodev,noexec,relatime,net_cls)
cgroup_blkio on /sys/fs/cgroup/blkio type cgroup
(rw,nosuid,nodev,noexec,relatime,blkio)
cgroup_perf_event on /sys/fs/cgroup/perf_event type cgroup
(rw,nosuid,nodev,noexec,relatime,perf_event)"
It works well now, but I had to make a basic script (attached to this
bugreport) for mounting all of that at the start of my host.
I had a conversation with Guido Günther and he told me to open this bug
report.
Here is the conversation:
"Hi,
On Wed, Oct 02, 2013 at 03:10:50PM +0200, Manuel VIVES wrote:
> Hello,
>
> I'm using libvirt for a profesionnal purpose on debian wheezy (libvirt
> version = 1.1.2-3) and I want to use LXC containers and Qemu-KVM VMs
> on the same host.
> I was having trouble doing this, because of the common mountpoint of
> my cgroups (they were all mounted in /sys/fs/cgroup), so I asked on
> #virt, here is the chat log:
> "
> <MVives> Hi
> <MVives> When trying to use LXC and qemu-kvm on the same
> host, I get the error message error : "virCgroupDetect:594 :
> Controller 'memory' is not wanted, but 'cpu' is co-mounted:" when I
> want to start a qemu guest
> <danpb> MVives: sounds like you co-mounted cgroup controllers on the same
> mount point rather than mounting them separately
> <MVives> danpb: So I need to mount every cgroup separately?
> <danpb> the minimal requirement is to have the cpu related ones separate
> <MVives> ok, I'm gonna try this
> <MVives> thanks ;)
> <danpb> i'd recommend just following systemds example setup
> http://paste.fedoraproject.org/43653/13807064
This link one does not exist anymore.
> So I made a basic script for my own usage which mounts /sys/fs/cgroup
> as tmpfs, and create all the dirs inside and mount the cgroup
> separately.
>
> I would like to know if it's possible to provide a script like this in
> the libvirt package for debian (for example an init script).
> If necessary, I'm willing to provide the patch for this script.
So this sounds like systemd gets it correct by default and this would
only be an issue for non systemd systems? I'm all in favour for marking
this work out of the box but I wonder if moving this to cgroup-bin or
cgroup-tools would be a better fit since I expect more tools to expect a
systemd like cgroup layout.
Why not open a bug against libvirt-bin with severity wishlist with your
script attached so we can work on from there. As a first step we could
at least ship it as an example in /u/s/doc/libvirt-bin/examples and
adjust README.Debian accordingly.
(please paste this mail to the bugreport too, so we don't need to repeat
things)
Cheers,
-- Guido
>
> Regards,
> Manuel VIVES
> "
So now we can consider adding an example to libvirt documentation or creating
an init script in the good package (either cgroup-bin/cgroup-tools or libvirt)
Regards,
Manuel VIVES
-- System Information:
Debian Release: 7.1
APT prefers stable
APT policy: (500, 'stable'), (1, 'experimental'), (1, 'unstable'), (1,
'testing'), (1, 'oldstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 3.10-0.bpo.2-amd64 (SMP w/16 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages libvirt-bin depends on:
ii adduser 3.113+nmu3
ii gettext-base 0.18.1.1-9
ii init-system-helpers 1.4-hns1
ii libaudit0 1:1.7.18-1.1
ii libavahi-client3 0.6.31-2
ii libavahi-common3 0.6.31-2
ii libblkid1 2.20.1-5.3
ii libc6 2.13-38
ii libcap-ng0 0.6.6-2
ii libdbus-1-3 1.6.8-1
ii libdevmapper1.02.1 2:1.02.74-7
ii libgcrypt11 1.5.0-5
ii libgnutls26 2.12.20-7
ii libnetcf1 1:0.2.3-3~bpo70+1
ii libnl-3-200 3.2.7-4
ii libnl-route-3-200 3.2.7-4
ii libnuma1 2.0.8~rc4-1
ii libparted0debian1 2.3-12
ii libpcap0.8 1.3.0-1
ii libpciaccess0 0.13.1-2
ii libreadline6 6.2+dfsg-0.1
ii libsasl2-2 2.1.25.dfsg1-6+deb7u1
ii libudev0 175-7.2
ii libvirt0 1.1.2-3hns1
ii libxenstore3.0 4.1.4-3+deb7u1
ii libxml2 2.8.0+dfsg1-7+nmu1
ii libyajl2 2.0.4-2
ii logrotate 3.8.1-4
Versions of packages libvirt-bin recommends:
ii bridge-utils 1.5-6
ii dmidecode 2.11-9
ii dnsmasq-base 2.62-3+deb7u1
ii ebtables 2.0.10.4-1
ii gawk 1:4.0.1+dfsg-2.1
ii iproute 20120521-3+b3
ii iptables 1.4.14-3.1
ii libxml2-utils 2.8.0+dfsg1-7+nmu1
ii netcat-openbsd 1.105-7
ii parted 2.3-12
ii pm-utils 1.4.1-9
ii qemu 1.1.2+dfsg-6a
ii qemu-kvm 1.1.2+dfsg-6
Versions of packages libvirt-bin suggests:
pn auditd <none>
ii policykit-1 0.105-3
ii radvd 1:1.8.5-1
pn systemtap <none>
-- Configuration Files:
/etc/libvirt/libvirtd.conf changed [not included]
/etc/libvirt/lxc.conf changed [not included]
/etc/libvirt/qemu.conf [Errno 13] Permission non accordée:
u'/etc/libvirt/qemu.conf'
/etc/libvirt/qemu/networks/default.xml [Errno 13] Permission non accordée:
u'/etc/libvirt/qemu/networks/default.xml'
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