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When webdevs choosing port for their app
(lemmy.nz)
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this post was submitted on 21 Jul 2025
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Welcome to the community then :) For rootful Docker you are correct - the inside port can be 80 and you can expose it on whatever port you want (ideally you expose it only via reverse proxy and not by port - I can recommend Caddy-Docker-Proxy for that)
I use Traefik already, but thank you! :)
Also a great choice :)
Got me curious on rootless vs root docker, there's so much.
Since rootless docker is (mostly) a security improvement, here is a interesting list of other Docker realted security tips I like to consult: https://cheatsheetseries.owasp.org/cheatsheets/Docker_Security_Cheat_Sheet.html
If you're using a reverse-proxy, why bother mapping ports at all?
Absolutely, it is not necessary if the proxy can reach the service in other ways (e.g. a shared network). Some non-http services don't like to be proxied though. Some constellations where the proxy is not on the same host as the containers may also make it necessary. My answer was based on the possibility to not have the same inside/outside port, not necessarily the need though😉