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EDIT: For some context, I recently gave podman another go. I have a few services on my homelab server set up in docker containers, so I tried migrating to podman.
After the second major bug (open issue on github) I encountered looked like it would require completely dropping using compose files to work around, I gave up and went back to docker.
I like the idea of podman, but it’s just not stable. I’ll try again in a year or so.
As a bonus, docker’s CLI is significantly nicer.
What's podman?
It's a daemonless client for managing Linux containers. So any "docker" container. Most Linux distros have a native package for it too
Podman is the RedHat implementation of the Open Container Initiative (OCI).
A Dockerfile and a Containerfile are both OCI. Docker and Podman can generally both use either.
Contrasted with Docker, Podman has better security defaults, and installers and licenses that are both actually open source. (Parts of Docker are open source. Parts are not.)
Docker used to lead with additional features beyond OCI such as Docker Compose, but Podman Compose has been a thing for a while, now.
The more mature a product is, the more likely it works perfectly with any OCI compliant tool.
For rookie work, I feel like there's still fair odds the developer only uses Docker and may rely on some anti-pattern that requires setting "bad security=ok" settings before their project will work in Podman.
Your mileage may vary.
How does podman handle docker compose tasks?
Probably as good as it can, you shouldn't use docker compose with podman anyway, there are two alternatives (quadlets - they describe everything as a systemd units and kube yaml - they use standard k8s yaml files including pods, deployments, secrets, etc.), both arguably better than compose.
I've always had issue with podman-compose. So I setup a podman socket and use it with docker compose.
Am I the only one who struggles with podman permissions? Every time I try to use it one service or another doesn't work.
I tried for immich (only service I expose) and failed.