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I am researching LXC. The thing I was unable to find is how to give a container public IP address?

Suppose we have a server with 5 IP addresses. Then we do 4 containers there and give somehow one address for each of them.

I saw there is "standard" way for LXD, but I found nothing for LXC.

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What I do in LXC is to have the server interface being a bridge, so the server has IP1 set on the bridge, and the four container interfaces becomes part of that bridge. Just configure your container networking to be:

lxc.network.type = veth
lxc.network.flags = up
lxc.network.link = <your server bridge interface>
lxc.network.name = eth0

And then you set your container IP as usual in the container. You can also set the IP in the lxc config if you want:

lxc.network.ipv4 = <IP>/24
lxc.network.ipv4.gateway = <gw IP>

How you do that is up to you. There are also other network types, so please do read up on that.

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