Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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I'm very much biased towards Podman, but from what I understand rootless Docker is a bit of an afterthought, while Podman has been developed from the ground up with rootless in mind. That should be reason enough.
The very few things Docker can do that Podman struggles a bit with are stuff that usually involves mounting the Docker socket in the container or other stupid things. Since you care about security, you wouldn't do that anyway. Not to mention there's also rootful Podman, when you need that level of access.
I'd recommend an RPM-based distro with Podman, the few times I've tried Podman on a deb distro, there's always been something wonky. It's been a while, though.
I'm thinking about an immutable OS with podman support first and foremost. Would you recommend Fedora CoreOS?
It's a really solid combo, but if you're not familiar with CoreOS I wouldn't change both at once. Meaning migrate the services to Podman first, then switch the OS. I've meant to switch from Alma 9 to CoreOS a long time, but haven't found the time.
I noticed you run Nextcloud AIO, just so you know, that's one of those "mount the docker socket" monstrosities. I'd look into switching to the community NC image and separate containers managed yourself. AIO is easy, but if someone gets shell to the NC container, it's basically giving root to your host.
Either way, you're going to have trouble running AIO with Podman.