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I setup LXC using:

lxc-create -t ubuntu -n lxcguest1

But I can't access any services running on it from my LAN, it appears to be NATed. How do I set it up so that I can access it (it probably needs to get it's dhcp address from my Linksys router)?


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Possible duplicate of… – sebgymn Sep 18 '13 at 11:31

3 Answers 3

up vote 4 down vote accepted

I've just dealt with this issue myself. Basically you need to setup a bridge and bind your network card and container to it. Here is the article I followed:

Sounds as if like me, you require the 'bridge' solution rather than the NAT solution. I also turned off the default LXC bridge setup (which is NAT'ed). To do this just edit the file: /etc/default/lxc and change USE_LXC_BRIDGE="TRUE" to USE_LXC_BRIDGE="FALSE" and reboot.

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My setup on Ubuntu 14.04.1 LTS (Trusty Tahr) hosts

Add to /etc/network/interfaces on the host

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static

auto br0
iface br0 inet dhcp
    bridge_ports eth0

(reboot after changes)

And on the container config files (/var/lib/lxc/containername/config) I set = br0

With this the container will get public ip addresses from the dhcp server just like the host.

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@JonathanY. The br0 should appear after adding it to /etc/network/interfaces as stated in the answer. You might need a reboot. – Epeli Jan 14 at 8:58
Thanks. What I was missing was needing to add <username> veth br0 2 to /etc/lxc/lxc-usernet in order to use br0 with unprivileged containers. – Jonathan Y. Jan 14 at 16:09

I used the default Ubuntu LXC settings, and configured my router to send all traffic on to the Ubuntu machine. On a DD-WRT enabled router, the settings look something like the screenshot below. Replace with the IP of the machine running LXC. Other routers should have similar options to set up a static route (here are static route instructions for Linksys, for example).

DD-WRT settings for static routing to LXC

This is unrelated, but I also used the DNSMasq service to point a hostname to the LXC container's IP address. This way I can access the container at http://gitlab/ anywhere on the network. In my opinion it's a lot easier to use a hostname to access a container than remember the IP address.

DD-WRT DNSMasq settings

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