Comment on PSA: Docker nukes your firewall rules, and replaces them with its own.
justJanne@startrek.website 8 months agoThat assumes you’re on some VPS with a hardware firewall in front.
Often enough you’re on a dedicated server that’s directly exposed to the internet, with those iptables rules being the only thing standing between your services and the internet.
lemmyvore@feddit.nl 8 months ago
What difference does it make if you open the ports yourself for the services you expose, or Docker does it for you? That’s all that Docker is meant to do, act as convenience so you don’t have to add/remove rules as the containers go up/down, or remember Docker interfaces.
If by any chance you are making services listen on 0.0.0.0 and covering them up with a firewall that’s very bad practice.
justJanne@startrek.website 8 months ago
There’s no alternative for 0.0.0.0 and a firewall if you’re e.g. using kubernetes.
lemmyvore@feddit.nl 8 months ago
I’m fairly sure you can find an alternative to whatever problem you’re having.
justJanne@startrek.website 8 months ago
You need to be able to have multiple nodes in one LAN access ports on each others’ containers without exposing those to the world and without using additional firewalls in front of the nodes.
That’s why kubernetes ended up removing docker support and instead recommends podman or using containerd natively.