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Last active March 5, 2024 00:34
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lxd-bridge.md
  • Container is named "guest"
  • Bridge is named lbr0
  • Bridged interfaces are enp1s2 on the host and eth1 in the container
  • According to the docs, the host interface enp1s2 is expected to be unconfigured before starting, but I'm not sure if that's a strict requirement.

Commands:

sudo ip link set up enp1s2
# Stopping the guest first probably isn't necessary, but I didn't test without it.
lxc stop guest
lxc network create lbr0 bridge.external_interfaces=enp1s2 ipv4.address=none ipv4.dhcp=false ipv4.nat=false ipv6.address=none ipv6.dhcp=false ipv6.nat=false
lxc network attach lbr0 guest eth1
lxc start guest
lxc exec guest -- /bin/bash

Then configure eth1 for DHCP in the container using whatever network configuration tools are present.

Alternatively:

I believe it's possible to modify the existing default bridge, lxdbr0:

lxc network set lxdbr0 bridge.external_interfaces=enp1s2
lxc network set lxdbr0 ipv4.address=none
lxc network set lxdbr0 ipv4.dhcp=false
lxc network set lxdbr0 ipv4.nat=false
lxc network set lxdbr0 ipv6.address=none
lxc network set lxdbr0 ipv6.dhcp=false
lxc network set lxdbr0 ipv6.nat=false
@EMCP
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EMCP commented May 30, 2021

according to my quick attempt, you cannot bridge configured network interfaces.. so be sure to drop those first

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