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submitted 6 months ago* (last edited 6 months ago) by jobbies@lemmy.zip to c/selfhosted@lemmy.world

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You're probably already aware of this, but if you run Docker on linux and use ufw or firewalld - it will bypass all your firewall rules. It doesn't matter what your defaults are or how strict you are about opening ports; Docker has free reign to send and receive from the host as it pleases.

If you are good at manipulating iptables there is a way around this, but it also affects outgoing traffic and could interfere with the bridge. Unless you're a pointy head with a fetish for iptables this will be a world of pain, so isn't really a solution.

There is a tool called ufw-docker that mitigates this by manipulating iptables for you. I was happy with this as a solution and it used to work well on my rig, but for some unknown reason its no-longer working and Docker is back to doing its own thing.

Am I missing an obvious solution here?

It seems odd for a popular tool like Docker - that is also used by enterprise - not to have a pain-free way around this.

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[-] BCsven@lemmy.ca 3 points 6 months ago

Not sure about the distro being used, opensuse makes a docker zone to put docker interfaces on, those have their own ports and rules separate then the Ethernet assigned zone ports/services to allow. For me I had the opposite issue, I couldn't reach my docker containers from my lan, onky from the local machine because the Ethernet was on an internal zone and Docker was on its own zone. I'm not a superskilled networker dude so I just turned on forwarding and masquerade so the incoming LAN zone would forward to doocker zone and pretend to be the local machine connecting and not a LAN or remote IP. I guess if you moved your dockers too the public zone you could get in trouble

this post was submitted on 07 Dec 2025

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