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Context: Docker bypasses all UFW firewall rules (lemmy.world)
submitted 1 year ago by 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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[–] [S] 1 point 1 year ago (2 children)

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

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  • [–] 2 points 1 year ago (1 child)

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

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  • [–] [S] 2 points 1 year 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
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