[Pkg-libvirt-maintainers] Bug#694638: libvirt-bin: problem with filesystem type=block in LXC domains

[Tomasz Nowak]

Package: libvirt-bin
Version: 0.9.12-5
Severity: important

Dear Maintainer,


There seems to be a problem with using filesystem stored on block device as
rootfs for LXC domains.
Basically I'm using "filesystem type='block'" with "source dev" and "target
dir=/" in libvirt to define LXC domain.
But it seems container is not using this filesystem (I think it is using
root filesystem of the host).
Once the virtual machine is started it breaks libvirtd on the host.

How to reproduce:

# vim /etc/default/grub
  GRUB_CMDLINE_LINUX=" cgroup_enable=memory "

# vim /etc/fstab
  cgroup  /sys/fs/cgroup  cgroup  defaults  0   0

# update-grub
# reboot

# lvcreate -L 1G -n vm01_rootfs vg
# mkfs.ext3 /dev/vg/vm01_rootfs
# mount /dev/vg/vm01_rootfs /mnt
# debootstrap --verbose wheezy /mnt
# umount /mnt


# virsh net-edit default
<network>
  <name>default</name>
  <uuid>c8e9c6e4-41d6-54de-8354-8d3cd44d9d17</uuid>
  <forward mode='nat'/>
  <bridge name='virbr0' stp='on' delay='0' />
  <mac address='52:54:00:14:DD:6B'/>
  <ip address='192.168.222.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.222.2' end='192.168.222.254' />
    </dhcp>
  </ip>
</network>

# virsh net-autostart default
# virsh net-start default


# vim vm01.xml
<domain type='lxc'>
  <name>vm01</name>
  <memory>500000</memory>
  <os>
    <type>exe</type>
    <init>/sbin/init</init>
  </os>
  <devices>
    <emulator>/usr/lib/libvirt/libvirt_lxc</emulator>
    <filesystem type='block' accessmode='passthrough'>
      <source dev='/dev/vg/vm01_rootfs'/>
      <target dir='/'/>
    </filesystem>
    <console type='pty'>
      <target type='lxc' port='0'/>
    </console>
  </devices>
</domain>

# virsh -c lxc:// define vm01.xml

# echo 'echo HOST >/I_AM_HOST' >/etc/rc.local
# virsh -c lxc:// start vm01

# ls /I_AM_HOST
I_AM_HOST


# virsh -c lxc:// list --all
error: Failed to connect socket to '/var/run/libvirt/libvirt-sock': No such
file or directory
error: failed to connect to the hypervisor

Regards,
Tomasz


-- System Information:
Debian Release: wheezy/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-4-amd64 (SMP w/1 CPU core)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.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  libavahi-client3    0.6.31-1
ii  libavahi-common3    0.6.31-1
ii  libblkid1           2.20.1-5.2
ii  libc6               2.13-35
ii  libcap-ng0          0.6.6-2
ii  libdbus-1-3         1.6.8-1
ii  libdevmapper1.02.1  2:1.02.74-4
ii  libgcrypt11         1.5.0-3
ii  libgnutls26         2.12.20-2
ii  libnetcf1           0.1.9-2
ii  libnl1              1.1-7
ii  libnuma1            2.0.8~rc4-1
ii  libparted0debian1   2.3-11
ii  libpcap0.8          1.3.0-1
ii  libpciaccess0       0.13.1-2
ii  libreadline6        6.2-8
ii  libsasl2-2          2.1.25.dfsg1-6
ii  libudev0            175-7
ii  libvirt0            0.9.12-5
ii  libxenstore3.0      4.1.3-3
ii  libxml2             2.8.0+dfsg1-6
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
ii  ebtables        2.0.10.4-1
ii  gawk            1:4.0.1+dfsg-2
ii  iproute         20120521-3
ii  iptables        1.4.14-3
ii  libxml2-utils   2.8.0+dfsg1-6
ii  netcat-openbsd  1.105-7
ii  parted          2.3-11
ii  qemu-kvm        1.1.2+dfsg-2

Versions of packages libvirt-bin suggests:
pn  policykit-1  <none>
pn  radvd        <none>

-- Configuration Files:
/etc/libvirt/qemu/networks/default.xml [Errno 13] Permission denied:
u'/etc/libvirt/qemu/networks/default.xml'

-- no debconf information
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