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Docker firewall question (lemmy.ml)

submitted 1 month ago* (last edited 1 month ago) by Quail4789@lemmy.ml to c/selfhosted@lemmy.world

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I've recently learned that UFW firewall rules do not affect Docker containers. I am looking into learning firewall rules in depth but in the meantime I want make sure I don't fuck something up, so here are a few questions:

1- On a host that drops all incoming connections (configured through UFW), if I have a container with only a single port mapping 127.0.0.1:8080:80 is there any way to access this container through the public internet, what about 8080:80 or no port mapping at all?

2- How do I drop all incoming connections to all Docker containers and do I need to do that? Similar to ufw default deny incoming?

3- Is there a way to see all incoming/outgoing connections of all containers?

Thanks in advance and any resource advice for securing docker for dummies is appreciated.

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[–] tux7350@lemmy.world 16 points 1 month ago

Oh boy I went down this same rabbit hole awhile ago. Here is a git repository that will explain why this happens and also offers a fix on how to modify your IP tables to ensure that docker respects the UFW.

Docker and UFW