The next step to simplify this even further is to use Quadlet within systemd to manage the containers. More details are at https://www.redhat.com/en/blog/quadlet-podman
useradd --comment "Helper user to reserve subuids and subgids for Podman" \
--no-create-home \
--shell /usr/sbin/nologin \
containers
> User= causes lots of issues with running podman and rootless support is fairly easy. I also recomend that people look at using rootful with --userns=auto, which will run your containers each in a unique user namespace. ― https://github.com/containers/podman/issues/12778#issuecomme...
> Of course, as my luck would have it, Podman integration with systemd appears to be deprecated already and they're now talking about defining containers in "Quadlet" files, whatever those are. I guess that will be something to learn some other time.
To me that's why compose is neat. It's simple. Works well with rootless podman also.
I'm using this tonspeedup my quadlet configs whenever I want to deploy a new service that invariably has a compose file.
Services are conceptually similar to pods in podman. Volumes and mounts are the same. Secrets or mounts can do configs, and I think podman handles secrets much better than docker. I searched for and found examples for getting traefik to work using quadlets. There are a few networking wrinkles that require a bit of learning, but you can mostly stick to the old paradigm of creating and attaching networks if that's your preference, and quadlets can handle all of that.
Quadlets use ini syntax (like systemd unit files) instead of YAML, and there is currently a lack of tooling for text highlighting. As you alluded, quadlets require one file per systemd service, which means you can't combine conceptually similar containers, networks, volumes, and other entities in a single file. However, podman searches through the quadlet directories recursively, which means you can store related services together in a directory or even nest them. This was a big adjustment, but I think I've come to prefer organizing my containers using the file system rather than with YAML.