this post was submitted on 07 Sep 2023
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Programming

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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] 1 points 1 year ago (3 children)

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

[–] agilob 1 points 1 year ago (2 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

[–] agilob 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