this post was submitted on 07 Sep 2023
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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/[email protected]
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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] 1 points 1 year ago (1 children)

Do you have more details how you're doing this? Using a custom executor still?

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

We are using the kubernetes executor. You can add additional sidecar services for your jobs, and we're using that mechanic to run podman as a daemon. There are some gotchas I had to solve if I remember, but now it works nicely for us. Except for Testcontainers, which throws an exception when your Testcontainer is exposing ports

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

I got it all working on self hosted kubernetes and crossplatform builds with buildah. What's your problem exactly? For TC you need to use some env vars to configure ports in .gitlabci

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

Do you have a working snippet somewhere I could take a look at?

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

I'll try to find it tomorrow

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

I'm very interested in a solution. Our current setup, where we use an external docker host for Testcontainers and Podman to build images is quite painful

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

I have this on my to-do list, but sorry, can't promise when I'll make a working demo. afair the trick was to use something like "podman in-podman", like dind works in GitLab runners and then some env-vars manipulation so TC thinks it runs in docker, something like

DOCKER_HOST=unix:///run/user/1000/podman/podman.sock and I use alpine as gitlab-ci helper image:

        image = "docker.io/alpine:3.17.2"
        helper_image_flavor = "alpine"

not sure if that matters, but i had lots of strange problems running with Ubuntu helper images, most were DNS propagation issues

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

Ahh, I had skimmed over and didn't see you were running it on k8s (so kubernetes executor makes sense. ;) )

This is good to know though. I actually just stood up a podman runner and it is vastly improved over what I had to do even a year ago if I remember. I'll need to look into Testcontainers though too as we do use that. Good to know it's at least progressing pretty well. Thanks!