How to Replace Docker with Podman on a Mac
My understanding is that this old article is no longer the simplest/easiest way of doing this. For that, see https://marcusnoble.co.uk/2021-09-01-migrating-from-docker-t.... tl;dr:    $ brew install podman
    $ podman machine init
    $ podman machine start
    $ alias docker=podman

If you're on an M1 you may run into https://github.com/containers/podman/issues/10577 (which is WIP, and may have been resolved by https://github.com/containers/podman/pull/11451).