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Docker security (lemmy.zip)

submitted 3 days ago* (last edited 3 days 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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[–] GreenKnight23@lemmy.world 1 points 2 days ago (1 children)

this is selfhosted. a community that's predominantly amateur or hobbyist.

[–] atzanteol@sh.itjust.works 1 points 2 days ago (1 children)

But absolutely none of the issues you listed are issues with iptables.

[–] GreenKnight23@lemmy.world 1 points 1 day ago (1 children)

I wouldn't go onto a teen community and spout off how to make explosives even though they're relatively safe to a trained individual.

same reason behind not allowing a hobbyist and amateur community to think that iptables and firewalld is the best/only solution.

it's dangerous and someone will get hurt eventually.

[–] atzanteol@sh.itjust.works 1 points 1 day ago

This is... Pretty stupid. There are things to be careful about but it's pretty straight forward to use iptables.