[Bug 918946] Re: cannot run libvirt in an 'lxc create -t ubuntu' container

[Scott Moser]

re-attaching libvirt.xml (this one has full, not relative, path to
/tmp/disk.img, and has 'qemu' as the type).


** Description changed:

  if you try to start a qemu/kvm guest from inside a container crated by lxc create -t ubuntu, it will fail with something like:
  error: Failed to start domain my.img
  error: unable to allow device /dev/full: Operation not permitted
  
  $ lxc-create -t ubuntu -n lv1
  $ lxc-start -n lv1 -d
  $ lxc-console -n lv1
  # login here
- % apt-get install qemu-kvm
+ % apt-get install qemu-kvm wget
  % apt-get install dbus # bug 918343
  % apt-get install libvirt-bin
- % qemu-img create -f qcow2 /tmp/disk.img 1G
+ % wget http://launchpad.net/cirros/trunk/0.3.0/+download/cirros-0.3.0-x86_64-disk.img -O disk.zimg
+ % qemu-img convert disk.zimg -O qcow2 /tmp/disk.img
  % virsh define libvirt.xml
  % virsh start mytest
  
  from a working qemu guest, I see:
  # cat /sys/fs/cgroup/devices/libvirt/qemu/myname/devices.list
  c 136:* rw
  c 1:3 rw
  c 1:7 rw
  c 1:5 rw
  c 1:8 rw
  c 1:9 rw
  c 5:2 rw
  c 254:0 rw
  
  So I think we need to add access to that list of devices. (haven't testd
  this all the way yet).
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: lxc 0.7.5-3ubuntu5
  ProcVersionSignature: User Name 3.2.0-8.15-virtual 3.2.0
  Uname: Linux 3.2.0-8-virtual x86_64
  ApportVersion: 1.90-0ubuntu1
  Architecture: amd64
  Date: Thu Jan 19 21:52:06 2012
  Ec2AMI: ami-0000012b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: lxc
  UpgradeStatus: No upgrade log present (probably fresh install)

** Attachment removed: "libvirt.xml referenced in bug report"
   https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/918946/+attachment/2683222/+files/libvirt.xml

** Attachment added: "libvirt.xml referenced in bug report"
   https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/918946/+attachment/2683440/+files/libvirt.xml

** Description changed:

  if you try to start a qemu/kvm guest from inside a container crated by lxc create -t ubuntu, it will fail with something like:
  error: Failed to start domain my.img
  error: unable to allow device /dev/full: Operation not permitted
  
  $ lxc-create -t ubuntu -n lv1
  $ lxc-start -n lv1 -d
  $ lxc-console -n lv1
  # login here
  % apt-get install qemu-kvm wget
  % apt-get install dbus # bug 918343
  % apt-get install libvirt-bin
  % wget http://launchpad.net/cirros/trunk/0.3.0/+download/cirros-0.3.0-x86_64-disk.img -O disk.zimg
  % qemu-img convert disk.zimg -O qcow2 /tmp/disk.img
+ % wget https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/918946/+attachment/2683440/+files/libvirt.xml
  % virsh define libvirt.xml
  % virsh start mytest
  
  from a working qemu guest, I see:
  # cat /sys/fs/cgroup/devices/libvirt/qemu/myname/devices.list
  c 136:* rw
  c 1:3 rw
  c 1:7 rw
  c 1:5 rw
  c 1:8 rw
  c 1:9 rw
  c 5:2 rw
  c 254:0 rw
  
  So I think we need to add access to that list of devices. (haven't testd
  this all the way yet).
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: lxc 0.7.5-3ubuntu5
  ProcVersionSignature: User Name 3.2.0-8.15-virtual 3.2.0
  Uname: Linux 3.2.0-8-virtual x86_64
  ApportVersion: 1.90-0ubuntu1
  Architecture: amd64
  Date: Thu Jan 19 21:52:06 2012
  Ec2AMI: ami-0000012b
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.small
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: lxc
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/918946

Title:
  cannot run libvirt in an 'lxc create -t ubuntu' container

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