[Lxc-users] Networking between host and container

[Stéphane Graber]

On 12/28/2012 01:20 PM, Marko Anastasov wrote:
> 
> On Dec 28, 2012, at 11:47 , Stéphane Graber <stgraber at ubuntu.com> wrote:
> 
>> On 12/28/2012 10:27 AM, Marko Anastasov wrote:
>>> Hello,
>>>
>>> What is the best way to broadcast container's hostname to host? I want to be able to ssh from host into the container using its hostname as handle, instead of an IP address.
>>>
>>> I'm using the default template in Ubuntu 12.04. I have made a container template that I want to reuse. My first attempt was to install avahi-daemon on host and container, replace hostname in container config, fstab, /etc/hosts, /etc/hostname and dhclient.conf with some unique id. This worked in VirtualBox, but for some reason not on a real machine.
>>>
>>> Thanks,
>>> Marko
>>
>> Not exactly an answer to your question, but should be an answer to your
>> problem anyway:
>> http://www.stgraber.org/2012/07/17/easily-ssh-to-your-containers-and-vms-on-ubuntu-12-04-lts/
> 
> Hi Stéphane,
> 
> I should note that I'm working with a server installation of 12.04, and packages dnsmasq and resolvconf are actually not installed by default. I've added them but I'm not sure what's next. So I think I'm missing some configuration that you assume on your blog.

LXC in Ubuntu comes with dnsmasq-base and resolvconf was introduced by
default by me in Ubuntu 12.04, so you have it for sure or you're not
using a supported Ubuntu installation (resolvconf is part of
ubuntu-minimal).

> 
> Eg output of host $(echo %h | sed "s/\\.lxc//g") 10.0.3.1 is
> 
> Using domain server:
> Name: 10.0.3.1
> Address: 10.0.3.1#53
> Aliases: 
> 
> Host %h not found: 3(NXDOMAIN)

That's because once put in your ssh config, the %h will be replaced by
the name of your container.

Try "host <container name> 10.0.3.1", that'll return the IP address of
your container as long as it's using DHCP for its IP configuration.

> Thanks,
> Marko
> 


-- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com

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