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

[Richard Weinberger]

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...

Thanks,
//richard