[libvirt-users] Hotplug of disk devices in LXC failed with libvirt of version 1.0.2

[hzguanqiang]

On 2013-07-17 17:47, Gao feng <gaofeng at cn.fujitsu.com> wrote:
>>On 07/17/2013 04:15 PM, Gao feng wrote:
>> On 07/16/2013 01:29 PM, Guan Qiang wrote:
>>> 于 2013/7/15 17:32, Gao feng 写道:
>>>> On 07/15/2013 05:18 PM, hzguanqiang wrote:
>>>>> Hi, Gao Feng
>>>>>
>>>>> I've tried what you said, but still exists the problem:
>>>>>
>>>>> ubuntu at lxc:~$ vir attach-disk instance-0000002c   /dev/dm-0 sdb
>>>>> error: Failed to attach disk
>>>>> error: Unable to create device /proc/10366/root/dev/sdb: Permission denied
>>>>>
>>>>> I think finding what it means by saying 'Unable to create device /proc/10366/root/dev/sdb: Permission denied' is the key.
>>>>> But anyway, thanks for your help!
>>>>>
>>>> Do you have <idmap> configured for your lxc domain?
>>>> I just posted a patchset to fix the problem that failed to create device when user namespace enabled.
>>>>
>>>> BTW, does it work well if you directly write the configuration to the xml of lxc domain?
>>>>
>>>> Thanks
>>> Hi, Gao feng,
>>>
>>> I tried to write the configuration in the xml as you said, and it works.
>>>
>>> And I didn't set <idmap> configure for my lxc domain.  The xml content of my lxc domain is just as following:
>>>
>> ...
>>> I still don't understand why I can't hotplug attach disk device for the lxc domain.
>>> Expect more detailed answer, Thanks!
>>>
>> 
>> it's because apparmor deny libvirt to create device node under directory /proc/10366/root/dev/.
>> 
>> I don't know if this will help you, you can have a try.
>> 
>> change the apparmor profile of libvirtd. check the /etc/apparmor.d/usr.sbin.libvirtd,
>> and add /proc/ rw.
>
>ln -s /etc/apparmor.d/usr.sbin.libvirtd /etc/apparmor.d/disable/ & /etc/init.d/apparmor restart should work,
>but libvirtd will run out of apparmor's control.

Yes, it works. Thanks for help.

------------------     
Best regards!
GuanQiang
2013-07-19