This literally happened to me yesterday. Fortunately ufw enable did not configure it as persistent across reboots ๐ค
this post was submitted on 16 Feb 2024
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What is a good firewall that can also block ports published with docker? I'd need it to run on the same host.
Ufw should work, jus ufw block/limit/allow port number
I remember trying with ufw and the docker ports were still open. Iirc I've read somewhere that docker and ufw both use the same underlying software, so ufw cannot block docker (IP tables?)
Hmm, not sure. I know with docker you can "mock" ports for the container, where the port the container sees is different than the port on the system. Maybe you can do something with that?
I can configure the containers in ways that don't require ports to be published for the real network, but that's always possible. It would still be nice to have a firewall that can block even those containers that try to publish their ports to the whole (real) network.
Are your Docker containers connecting to the network (eg using ipvlan or macvlan)? The default bridge network driver doesn't expose the container publicly unless you explicitly expose a port. If you don't expose a port, the Docker container is only accessible from the host, not from any other system on the network.
They are Only in my docker bridge networks and have a few published ports
If you don't want the Docker container to be accessible from other systems then just don't publish the port.
Yeah of course, that's what I'm doing anyways, but the purpose of a firewall would be defense in depth, even is something were to be published, the firewall got it.
You want a virtual firewall. Is this for profit or just your science project because that's going to change the answer. You might hate me, but I'm still gonna say it, Cisco....
For my homelab, and I'll only host OSS
UFW does work with Docker, but requires some tweaking. IIRC you have to disallow Docker to modify IPTables and then add a rule to forward all traffic to the Docker network of your choice. It's a little finicky but works.
Interesting, I might have to read up on that next time. Thanks