docker-breaks-kvm-networking.md

aliases	category	classification	date	date_modified	draft	id	image	links	local_archive_links	pinned	print	series	tags	title	type
docker-breaks-kvm-networking	network	public	2023-01-23 08:28:35 -0800	2024-09-23 12:01:47 -0700	false	20230123162835		https://wiki.archlinux.org/title/Docker#Starting_Docker_breaks_KVM_bridged_networking	attachments/20230123162835.html	false	false		docker kvm bridge network	Fix for Docker Breaking KVM Networking	tech-note

Detailed on the ArchWiki below is a solution to an issue I was having when I tried to use a network bridge br0 alongside Docker on my server.

The solution that I thought worked initially was to add the below to /etc/docker/daemon.json. This got the bridge working for virtual machines, but broke Docker container external connectivity (containers couldn't access the internet).

{
  "bridge": "br0"
}

In the end I needed to run the iptables rule instead, and that got things working for both Docker and the Virtual Machines.

iptables -I FORWARD -i br0 -o br0 -j ACCEPT