[joombaga]

Just tried this because I usually use docker with k8s or compose, so wasn't sure of the behavior.

> It starts with the simple truth: `docker` doesn't `listen` on any port.

If I run the command below, `docker-proxy` starts listening on an incrementing port.

> Or maybe a simple question: How can I run `docker run -p 8080 nginx` over and over without port conflict?

Because you're not specifying a port on the host; you're specifying a port on the container. I've never used the single port form of `-p`; I would've guessed it was the same as `-p 8080:8080`.