552
Context: Docker bypasses all UFW firewall rules (lemmy.world)
submitted 3 months ago* (last edited 3 months ago) by qaz@lemmy.world to c/programmer_humor@programming.dev
106 comments fedilink hide all child comments

Docker docs:

Docker routes container traffic in the nat table, which means that packets are diverted before it reaches the INPUT and OUTPUT chains that ufw uses. Packets are routed before the firewall rules can be applied, effectively ignoring your firewall configuration.

you are viewing a single comment's thread
view the rest of the comments
[-] communism@lemmy.ml 2 points 3 months ago

https://github.com/chaifeng/ufw-docker

[-] qaz@lemmy.world 1 points 3 months ago

That caused issues with Docker containers being unable to communicate with eachother for me.

[-] tux7350@lemmy.world 2 points 3 months ago

Did you allow the containers to talk to eachother with ufw after setting it up?

[-] qaz@lemmy.world 2 points 3 months ago

Yes, you can fix it by doing this

echo "Adding rules for Docker subnets to allow communication between containers..."
for subnet in $(docker network inspect bridge -f '{{range .IPAM.Config}}{{.Subnet}} {{end}}'); 
    sudo ufw allow from $subnet
    echo "Added rule for $subnet"
done
this post was submitted on 29 Aug 2025
552 points (99.1% liked)

Programmer Humor

27720 readers
130 users here now

Welcome to Programmer Humor!

This is a place where you can post jokes, memes, humor, etc. related to programming!

For sharing awful code theres also Programming Horror.

Rules

founded 2 years ago
MODERATORS
Feyter@programming.dev
anzo@programming.dev
BurningTurtle@programming.dev
pylapp@programming.dev