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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?

3 years ago by Cyclohexane 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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0x442e472e 2 points 3 years ago

We are trying to use podman as a way to run Testcontainers and build images on a kubernetes cluster using Gitlab CI. Building works, but running Testcontainers doesn't so far :(

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jlh 2 points 3 years ago

Have you looked into kaniko?

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0x442e472e 1 point 3 years ago

Yes but imo it's easier and nicer to integrate Podman into an existing build, for example with maven

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timbuck2themoon 1 point 3 years ago

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0x442e472e 1 point 3 years ago

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

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