I am using LXC to host an http server in VirtualBox, but the simple bridge I created does not have an IP address, so it cannot be reached in the host.
I know your question specifically is about LXC (Linux Containers) which is something I am not 100% on, but I will provide some advice based on what I know about guest OS to host OS connections in VirtualBox. Maybe this dovetails with your LXC specific issue?
You say you want to have a simple bridge setup between the VirtualBox guest and the host, but what settings do you have in VirtrualBox for vboxnet0? To my knowledge, there are two places where the network settings need to be adjusted for a setup like this to work: Within the guest OS but also on the host OS itself.
I’m using a Mac, but the general concept should be the same for anyone else using VirtualBox on Windows or Linux: You need two adapters on a VirtualBox guest OS to ensure an outgoing network connection on the 10.x.x.xnetwork as well as a connection on the host only network which is usually192.168.x.x`.
If I go to “Preferences” when I launch VirtualBox and then click the “Network” icon and then click the “Host-only Networks” tab, I get a list of adapters I have setup:
Then—as shown in the screenshot—if I select vboxnet0 and then click the screwdriver icon, I can change options. Screenshot below:
I have the “IPv4 Address” set to 192.168.56.1 and the related IPv4 Network Mask set to 255.255.255.0. Now I usually have the DHCP server disabled as shown in the following screenshot:
Once that is setup, I make sure the guest OS in VirtualBox has the adapter enabled like this:
Note that I have a “Host-only Adapter” designated and that adapter is associated to vboxnet0? Once that is done, the guest OS should be fully aware of the host-only setup and you should be good to go.