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Fail2ban ufw nftables
port forward only the bare minimum (80 443)
Expose docker ports with 127.0.0.1:8000:8000 then port forward with caddy server on the host
Edit: add nftables
This is dangerous advice because docker is well-known for undoing UFW’s iptable rules. It’s mitigated by binding to localhost, but still way too easy for people to shoot themselves in the foot by using the two together.
Do not open those ports hosting is way to cheap now to take that risk!
Docker is going to undo your port iptable rules with or without ufw
Running
rm -rf ~isn’t that hard to do either just don’t do it.Your router’s NAT should save you if that happens on the wrong port anyway.
You shouldn’t suggest UFW at all then. There are other firewall options that can be used just fine with docker.
It does have real potential to cause issues, e.g. if OP were to put their server in DMZ mode on their router and later copy some docker setup instructions that don’t explicitly bind to localhost.
Please tell me more, which firewall would you recommend that plays nice with Docker?
No NAT? Hahaha that’s a big if, and why would you copy paste a docker compose without reading it?
Firewalld
Another user in this thread suggested DMZing, so combine your advice with theirs and boom. It’s not uncommon, and it’s fine if you firewall the box yourself. Most people don’t knowingly choose to use a firewall that they don’t intend to work, like you would.
There’s more than one way to use docker. Spinning up an official mysql image using the official
docker runORdocker composecalls suggested by the docs would start up a server wide open to the entire internet if DMZ’d.@monogram@feddit.nl nftables
Cool! ufw supports nftables too.
@monogram@feddit.nl yes. but I use it without UFW.
joke 18+
Fine I’ll go sit in the cuck chair again while you write out those long hard nftables commands to my server.