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PSA: Docker nukes your firewall rules and replaces them with its own. (sh.itjust.works)

submitted 3 months ago* (last edited 3 months ago) by [email protected] to c/selfhosted

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I use nftables to set my firewall rules. I typically manually configure the rules myself. Recently, I just happened to dump the ruleset, and, much to my surprise, my config was gone, and it was replaced with an enourmous amount of extremely cryptic firewall rules. After a quick examination of the rules, I found that it was Docker that had modified them. And after some brief research, I found a number of open issues, just like this one, of people complaining about this behaviour. I think it's an enourmous security risk to have Docker silently do this by default.

I have heard that Podman doesn't suffer from this issue, as it is daemonless. If that is true, I will certainly be switching from Docker to Podman.

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[–] Molecular0079 67 points 3 months ago (11 children)

If you use firewalld, both docker and podman apply rules in a special zone separate from your main one.

That being said, podman is great. Podman in rootful mode, along with podman-docker and docker-compose, is basically a drop-in replacement for Docker.

[–] [email protected] 12 points 3 months ago (8 children)

Is it? Last time I tried none of my docker compose files would start correctly in podman compose.

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