[lxc-users] Ubuntu container IP address

[Robert Koretsky]

Fajar:
Thanks for the references to the Ubuntu lxc and the network bridge docs, I
will carefully look those over for a solution to my problem. I did look at
those docs first, and tried various modifications to the configuration
files shown there, but didn't get anywhere. I will look again.
In VirtualBox, the bridging of the VM adapter to the host adapter is
accomplished by a single GUI menu choice.
In PC-BSD Jails, when creating a new jail, it is a matter of knowing, via
ipconfig, what sub-net the host is on (say 192.168.0) then supplying that
in jail setup.
In Solaris Zones, same as PC-BSD JAils.
I'm a networking newbie, forgive my ignorance.
Thanks again,
Sincerely,
Robert M. Koretsky

On Thu, Nov 19, 2015 at 2:43 PM, Fajar A. Nugraha <list at fajar.net> wrote:

> On Fri, Nov 20, 2015 at 5:04 AM, Robert Koretsky <bobk48 at gmail.com> wrote:
>
>> Guido et al:
>> Another suggestion I got from the Ubuntu Forums on virtualisation gave me
>> a single line that could be added to the iptables configuration( and also
>> some other alternate ways of using and configuring ufw) to achieve a "port
>> forwarding" of a port of interest, like 22, to the container IP 10.0.3.1
>> from my host IP 192.168.0.6. I am going to try this one-line iptables
>> method, see if it works. More importantly, once my container can be ssh'ed
>> to from my home network, will my host still be reachable. Other than that,
>> I'm not sure what else to do.
>>
>
> How about reading replies of your mail in the other thread you created?
>
> I'm going to assume it's because somehow you didn't get the replies in
> your inbox, so I CC your mail as well here.
>
>
>> Believe me, other suggested solutions were either 100-line long bash
>> scripts plus dozens of changes and package downloads, or were completely
>> off base.
>>
>
> You obviously haven't read Ubuntu's lxc documentation. Nor Ubuntu's
> network bridge documentation (
> https://help.ubuntu.com/lts/serverguide/network-configuration.html#bridging),
> which is also linked on lxc documentation page.
>
> It's NOT 100-line long script. And the required bridge packages is already
> installed when you install lxc.
>
> Again, can anyone tell me why lxcbr0 is configured to start with an IP of
>> 10.0.3.1?
>>
>
> The same reason why virtualbox uses NAT networking for VMs by default.
>
>
>> My Ubuntu 15.10 Desktop machine, which has a container, gets its IP via
>> DHCP from a router.
>>
>
> Assuming you've read the docs, bridging should work.
>
> The exception is if your desktop connects to LAN via wifi, in which case
> bridging will NOT work.
>
> --
> Fajar
>
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