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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
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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.

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[-] 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)

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