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Podman is a daemon-less alternative to Docker, but with Rootless containers, grouping containers in pods, and systemd integration. What do you think of it? (lemmy.ml)

submitted 1 year ago by [email protected] to c/programming

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Podman is a lot like Docker: a tool for running OCI containers. While it maintains backwards compatibility with Dockerfile and docker-compose syntax, it offers a lot of other benefits:

daemonless: it can run containers without a daemon process running in the background.
Rootless: can run containers without root privileges
pods: can group containers into secluded pods, which share resources and network namespace

Podman has other features I haven't explored yet, like compatibility with Kubernetes yaml file, and being able to run containers as systemd units.

Have you used podman before? What are your thoughts on it?

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[–] [email protected] 11 points 1 year ago (2 children)

Docker has rootless containers, too, although I think Podman has slightly better options for unprivileged uid management.

Daemonless is appealing, especially for low-powered servers. Getting rid of Docker's background resource usage is the main reason Podman is on my to-do list.

I imagine pods could be handy to reduce network configuration for related services.

I like that the tools exist to make Podman a drop-in replacement for Docker, including the building of containers.

I have no interest in systemd; I hope it's optional.

[–] [email protected] 1 points 1 year ago

In kubernetes, I often use multiple containers in a pod only to have init containers check certain status of other servers before running the main container. For example, making sure a database is online and I can query data from it. You can just add this to your main container's start script though. Docker has a way to do this sort of thing too but it feels clunky.

[–] [email protected] 1 points 1 year ago* (last edited 1 year ago)

Docker has rootless containers, too, although I think Podman has slightly better options for unprivileged uid management.

I have not used Docker rootless, but I imagine podman has much better and more flexible network configuration as well?

On systemd, I actually do not use systemd either, hence why I said I never tried those features. It is not a hard requirement at all. Though I have not tried to use any integrations with OpenRC and podman