[lxc-users] lxc-attach shows hosts root fs instead of containers'

[Wojciech Arabczyk]

Hi Florian,

Could you please post your configs? What lxc version are you using
btw? Build from scratch or installed from sys packages?

On 25 February 2014 14:25, Florian Klink <flokli at flokli.de> wrote:
> Hi Wojtek,
>
> thanks for your answer!
>
> I built a kernel with the same config, but with CONFIG_USER_NS set to "y".
>
> lxc-checkconfig now also reports user namespace as "enabled".
>
>
> But when I run lxc-attach, I still see the root file system of the host,
> not of the container...
>
> So the problem is not user-ns related.
>
> Steps to reproduce:
>
> lxc-create -n ${CONTAINER_NAME} -t archlinux
> lxc-start -n ${CONTAINER_NAME}
> lxc-attach -n ${CONTAINER_NAME} /bin/bash
> # ls -la / # shows hosts root file system!
>
>
> I was also able to reproduce this problem with a downloaded template
> (centos 6 amd64), so it doesn't seem to be archlinux related...
>
>
> Do you have any ideas how to investigate further?
>
>
> Florian
>
>
>
>
> Am 25.02.2014 10:46, schrieb Wojtek Arabczyk:
>> You failed to enable user namespace (which is clearly stated in the log
>> you posted).
>> Try enabling the user namespace and retest.
>>
>> --
>> Pozdraviam
>> Wojtek
>>
>> On Tuesday, 25 February 2014 at 10:34, Florian Klink wrote:
>>
>>> Hi,
>>>
>>> I created a basic archlinux container (using almost the template):
>>>
>>> lxc-create -n test -t archlinux
>>>
>>> I now start the container
>>>
>>> lxc-start -n test
>>>
>>> In another shell, I attach inside it:
>>>
>>> lxc-attach -n test [/bin/bash]
>>>
>>> And I see the root file system of the host!
>>>
>>> However, when I get into the machine by logging in from the lxc-start
>>> command, I see the correct root of the container.
>>>
>>> Some information about my system:
>>>
>>> -----
>>> lxc-1.0.0
>>> linux x86_64 3.13.5-1-zen
>>>
>>> --- Namespaces ---
>>> Namespaces: enabled
>>> Utsname namespace: enabled
>>> Ipc namespace: enabled
>>> Pid namespace: enabled
>>> User namespace: missing
>>> Network namespace: enabled
>>> Multiple /dev/pts instances: enabled
>>>
>>> --- Control groups ---
>>> Cgroup: enabled
>>> Cgroup clone_children flag: enabled
>>> Cgroup device: enabled
>>> Cgroup sched: enabled
>>> Cgroup cpu account: enabled
>>> Cgroup memory controller: enabled
>>> Cgroup cpuset: enabled
>>>
>>> --- Misc ---
>>> Veth pair device: enabled
>>> Macvlan: enabled
>>> Vlan: enabled
>>> File capabilities: enabled
>>>
>>> -----
>>>
>>> Looks like lxc-attach is unable to attach the MOUNT namespace? Or whats
>>> the problem here?
>>>
>>> Florian
>>>
>>>
>>> _______________________________________________
>>> lxc-users mailing list
>>> lxc-users at lists.linuxcontainers.org
>>> <mailto:lxc-users at lists.linuxcontainers.org>
>>> http://lists.linuxcontainers.org/listinfo/lxc-users
>>
>>
>>
>
>
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-- 
pozdrawiam
Wojciech Arabczyk