Prevent Docker from punching holes in a server's firewall

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Date: 2021-07-10
Category: docker

Docker will directly modify iptables depending on how you map ports to containers.

For example, say you run docker run -p 7000:80 website - this will map port on your host machine to port 80 inside the container, and in doing so will modify iptables to make :7000 available to the outside world.

If this is not desirable, and you'd like your service to only be available locally inside your host machine, you should run a command like docker run -p website.

This is why you should carefully read the docs before you use a piece of software :P