[lxc-users] LXC not responsive after update

[Bostjan Skufca]

strace command is your friend.

b.


On 21 January 2016 at 12:12, Viktor Trojanovic <viktor at troja.ch> wrote:

>
>
> On 20.01.2016 23:50, Fajar A. Nugraha wrote:
>
> On Thu, Jan 21, 2016 at 5:49 AM, Fajar A. Nugraha < <list at fajar.net>
> list at fajar.net> wrote:
>
>> On Thu, Jan 21, 2016 at 5:23 AM, Viktor Trojanovic <viktor at troja.ch>
>> wrote:
>>
>>> I just did a system upgrade on my Arch System which included updating
>>> the kernel, systemd and lxc to the newest versions. After having done so, I
>>> cannot interact with my Linux container any longer. The system within the
>>> container still seems to work fine and can be contacted from outside (Samba
>>> server) but if I try to use one of the lxc commands to query or otherwise
>>> interact with the container (e.g. lxc-ls -f, lxc-stop, lxc-console,
>>> lxc-attach), the command hangs until I cancel it with CTRL+C.
>>>
>>> I get the following message when cancelling lxc-ls -f (as root):
>>>
>>> ^CTraceback (most recent call list):
>>>   File "/usr/bin/lxc-ls", line 432, in <module>
>>>     containers = get_containers(root=True)
>>>   File "user/bin/lxc-ls", line 261, in get_containers
>>>     if container.controllable:
>>> KeyboardInterrupt
>>>
>>> Regular lxc-ls works normal, by the way.
>>>
>>> I can probably just reboot the server but I still wanted to ask around
>>> if anyone has an idea why this is happening and what I could do except
>>> rebooting to regain control of LXC? I tried already systemctl restart lxc
>>> but that doesn't help.
>>>
>>>
>>
>> Do you have lxcfs installed? If yes, this should be a know issue. When
>> you restart lxcfs, all existing running containers that use it will be
>> unable to access lxcfs-provided resources. AFAIK restarting lxc service
>> does restart running containers.
>>
>>
> That should be: AFAIK restarting lxc service does *NOT *restart running
> containers.
>
>
> Try killing one of those containers (lxc-stop -k -n ...), start it, and
>> then test again. If it works, do the same for other containers.
>>
>> --
>> Fajar
>>
>
> Hi Fajar,
>
> I'm not using lxcfs, just regular directory based containers.
>
> I cannot do anything with the containers.
>
> lxc-stop -k
> lxc-ls -f
> lxc-attach
> lxc-console
> systemctl stop lxc (or restart lxc)
>
> All these commands hang forever, I have to interrupt with CTRL+C and no
> output is written to the logs. But the container system keeps working fine,
> so does the host system.
>
> Viktor
>
>
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>
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