[libvirt] [PATCH v3 00/12] Add user namespace support for libvirt lxc

[Gao feng]

On 06/11/2013 04:51 AM, Richard Weinberger wrote:
> Am 10.06.2013 21:53, schrieb Richard Weinberger:
>> Am 10.06.2013 21:17, schrieb Richard Weinberger:
>>> Hi!
>>>
>>> Am 04.06.2013 13:03, schrieb Daniel P. Berrange:
>>>>> It's still under review. needs some ACK.
>>>>> If you can help to test or ACK this patchset, it will be very helpful. :)
>>>>>
>>>>> Actually, I just want to ping...
>>>>
>>>> I've been away on holiday for 2 weeks, so not had a chance to review
>>>> it yet. I'll get to it this week. I hope we'll get this in the 1.0.6
>>>> release this month.
>>>
>>> Finally I've found some time to test version 4 of the userns patch set.
>>> But I'm unable to create a container.
>>>
>>> ---cut---
>>> linux:~ # LANG=C /opt/libvirt/bin/virsh -c lxc:/// create c1.conf
>>> error: Failed to create domain from c1.conf
>>> error: Interner Fehler guest failed to start: PATH=/bin:/sbin TERM=linux container=lxc-libvirt container_uuid=3f86c48b-b027-4838-ba17-6202a1d7398b
>>> LIBVIRT_LXC_UUID=3f86c48b-b027-4838-ba17-6202a1d7398b LIBVIRT_LXC_NAME=c1 /bin/bash
>>> error receiving signal from container: Input/output error
>>> ---cut---
>>>
>>> lxcContainerWaitForContinue() in src/lxc/lxc_controller.c fails with EIO.
>>> Maybe because the clone()'ed child dies and the file descriptor used for synchronization becomes invalid.
>>>
>>> Here my container config:
>>> ---cut---
>>> <domain type='lxc'>
>>>    <name>c1</name>
>>>    <memory>102400</memory>
>>>    <os>
>>>      <type>exe</type>
>>>      <init>/bin/bash</init>
>>>    </os>
>>>    <idmap>
>>>          <uid start='0' target='100000' count='100000'/>
>>>          <gid start='0' target='100000' count='100000'/>
>>>    </idmap>
>>>    <devices>
>>>      <console type='pty'/>
>>>          <filesystem type='mount'>
>>>            <source dir='/root/c1/rootfs'/>
>>>            <target dir='/'/>
>>>          </filesystem>
>>>    </devices>
>>> </domain>
>>> ---cut---
>>>
>>> Any ideas how to debug this further?
>>> This is Linux 3.9.0 with all namespaces enabled.
>>
>> Whoops, forgot to add the libvirtd debug output:
>>
>> ---cut---
>> 2013-06-10 19:41:24.661+0000: 29211: debug : virCommandRunAsync:2241 : About to run
>> PATH=/usr/lib64/mpi/gcc/openmpi/bin:/sbin:/usr/sbin:/usr/local/sbin:/root/bin:/usr/local/bin:/usr/bin:/bin:/usr/X11R6/bin:/usr/games LIBVIRT_DEBUG=1 LIBVIRT_LOG_OUTPUTS=1:stderr
>> /opt/libvirt/lib/libvirt_lxc --name c1 --console 20 --security=none --handshake 23 --background
>> 2013-06-10 19:41:24.663+0000: 29211: debug : virFileClose:90 : Closed fd 24
>> 2013-06-10 19:41:24.663+0000: 29211: debug : virCommandRunAsync:2246 : Command result 0, with PID 29303
>> 2013-06-10 19:41:24.664+0000: 29303: debug : virFileClose:90 : Closed fd 3
>> 2013-06-10 19:41:24.665+0000: 29303: debug : virFileClose:90 : Closed fd 4
>> 2013-06-10 19:41:24.666+0000: 29303: debug : virFileClose:90 : Closed fd 5
>> 2013-06-10 19:41:24.666+0000: 29303: debug : virFileClose:90 : Closed fd 6
>> 2013-06-10 19:41:24.667+0000: 29303: debug : virFileClose:90 : Closed fd 7
>> 2013-06-10 19:41:24.667+0000: 29303: debug : virFileClose:90 : Closed fd 8
>> 2013-06-10 19:41:24.668+0000: 29303: debug : virFileClose:90 : Closed fd 9
>> 2013-06-10 19:41:24.668+0000: 29303: debug : virFileClose:90 : Closed fd 10
>> 2013-06-10 19:41:24.668+0000: 29303: debug : virFileClose:90 : Closed fd 11
>> 2013-06-10 19:41:24.668+0000: 29303: debug : virFileClose:90 : Closed fd 12
>> 2013-06-10 19:41:24.668+0000: 29303: debug : virFileClose:90 : Closed fd 13
>> 2013-06-10 19:41:24.669+0000: 29303: debug : virFileClose:90 : Closed fd 14
>> 2013-06-10 19:41:24.669+0000: 29303: debug : virFileClose:90 : Closed fd 15
>> 2013-06-10 19:41:24.670+0000: 29303: debug : virFileClose:90 : Closed fd 16
>> 2013-06-10 19:41:24.670+0000: 29303: debug : virFileClose:90 : Closed fd 17
>> 2013-06-10 19:41:24.670+0000: 29303: debug : virFileClose:90 : Closed fd 18
>> 2013-06-10 19:41:24.671+0000: 29303: debug : virFileClose:90 : Closed fd 19
>> 2013-06-10 19:41:24.671+0000: 29303: debug : virFileClose:90 : Closed fd 22
>> 2013-06-10 19:41:24.790+0000: 29211: debug : virCommandRun:2115 : Result status 0, stdout: '(null)' stderr: '(null)'
>> ---cut---
>>
>> Looks like libvirt_lxc was executed and died silently.
> 
> Found the problem. /opt/libvirt/var/log/libvirt/lxc/c1.log contained the info I needed.
> Search permissions for /root were missing. m(
> Would be nice if virsh would be able to tell one this...
> 

:)
have fun with user namespace & libvirt.
And thanks for your test.

Thanks,
Gao

> Thanks,
> //richard
>