[libvirt-users] LXC libvirt support

[Nirmal]

On Feb 18, 2011, at 2:17 AM, "Daniel P. Berrange"  
<berrange at redhat.com> wrote:

> On Thu, Feb 17, 2011 at 05:47:43PM -0800, Nirmal Guhan wrote:
>> 2011/2/11 Nirmal Guhan <vavatutu at gmail.com>:
>>> On Fri, Feb 11, 2011 at 9:05 PM, Osier Yang <jyang at redhat.com>  
>>> wrote:
>>>> 于 2011年02月12日 11:52, Nirmal Guhan 写道:
>>>>>
>>>>> Hi,
>>>>>
>>>>> Has anyone used libvirt to start/stop/manage LXC (linux  
>>>>> containers) ?
>>>>> Is it supported at all? Last I tried, had few issues and the  
>>>>> reply was
>>>>> :
>>>>
>>>> Yes, it's supported, though still much work to do, but the basic is
>>>> there.
>>>>
>>>>>
>>>>> ///
>>>>> Note that libvirt lxc driver is a different implementation from  
>>>>> lxc tools
>>>>> and doesn't use lxc tools internally.
>>>>
>>>> Indeed, it doesn't invoke lxc tools.
>>>>
>>>> You may not be able to do what
>>>>>
>>>>> you are doing with lxc tools. Especially, the driver doesn't  
>>>>> take aware
>>>>> of files and settings inside a container at all. You have to  
>>>>> prepare them
>>>>> by yourself in advance
>>>>
>>>> libvirt.org has the example, e.g. the busybox example, I guess it  
>>>> could
>>>> explain "the driver doesn't take care of files and setting inside a
>>>> container at all, you have to prepare them by yourself in advance."
>>>>
>>>> Regards
>>>> Osier
>>>
>>> Thanks. Will give a try.
>>> ~nirmal
>>>
>> Seeing some strange behavior running fedora 12 for both host and  
>> lxc container.
>> I do a define, start and console :
>>
>> [root at fedora12new lxc-libvirt-scripts]# virsh -c lxc:// console  
>> testf12new
>> Connected to domain testf12new
>> Escape character is ^]
>> --> I press enter here and virsh exits.
>>
>> I don't get login prompt always. Sometimes I do and when I try to
>> login it rejects my password. Apparently, the same rootfs works fine
>> with lxc tools and I can login.
>
> There are likely multiple problems here.  The issue where virsh exits
> is a bug in libvirts LXC console handling. During Fedora startup
> the init process will close & reopen the primary console. If libvirt
> notices this happen then it'll think the close is a shutdown and
> exit. I need to rewrite console handling to make this reliable.

Thanks. Let me know when you do and I can give a try.

>
> Rejecting the login is likely a configuration issue - perhaps a
> missing securetty entry, but also PAM has various things that
> relate to selinux / audit that don't work within a container and
> need to be removed - sadly i can't remember just which ones offhand,
> but try removing items from the PAM configs.

Sure...

>
>> Snippet from  etc/event.d/tty1 :
>> respawn
>> exec /sbin/mingetty pts/0
>>
>> I use "exec /sbin/mingetty tty1" for lxc tools and that works fine. I
>> had to try pts/0 for libvirt since tty1 does not even get me the
>> occasional login prompts I get with pts.
>>
>> Also even after virsh shutdown, I see that the container processes do
>> not exit. Is there something else I should do?
>
> This 'virsh shutdown' is requesting a graceful shutdown - guests  
> aren't
> required to honour this request. virsh detroy is the failsafe
Ok. Will try.
>
> Regards,
> Daniel
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