Introduction for beginners? about crun HOT 15 CLOSED

in the Podman man page there is some info on how to configure and use a different OCI runtime:

https://github.com/containers/libpod/blob/master/docs/source/markdown/podman.1.md

from crun.

@warmchang We have not made any decisions on that, at this point. Originally crun was for support for cgroupV2, but it also has some interesting features that runc does not, and @giuseppe is looking into adding additional features.

from crun.

Thank you.

It is quite easy to plug Crun to Podman by having the following in the /etc/containers/libpod.conf:

runtime = "crun"

[runtimes]
crun = [
    "/usr/bin/crun"
]

from crun.

The easiest way would probably be to use crun through a container engine such as Podman or CRI-O if you care about Kubernetes. FAIK, there is some work in progress for supporting crun also in containerd and in Moby/Docker.
I
If you'd like to use it directly, then you need a container image exploded on disk and already usable by crun since crun doesn't do any storage management.

Assuming you have a container image at rootfs, you can create a config file with crun spec:

$ ls -1
config.json
rootfs

At this point, you can tweak config.json with the configuration you wish.

I'd still suggest though to use it through a higher level tool as you won't have to worry about storage, or setup a network namespace beforehand

from crun.

Interesting. Thank you. I think this information belongs to README to make it clear how Crun is expected to be used.

So how to use Crun with Podman, specifically? Is it documented anywhere?

from crun.

thanks for confirming it works for you. Can we close the issue?

from crun.

I was hoping for some changes to README - just a few words about how to use Crun with Podman and a few words that Crun is a replacement to Runc rather than an alternative to rkt, Docker, etc...

from crun.

I was hoping for some changes to README - just a few words about how to use Crun with Podman and a few words that Crun is a replacement to Runc rather than an alternative to rkt, Docker, etc...

yes that sounds like a good idea. Would you mind to open a PR with these improvements for the README file? I'll be happy to review it

from crun.

Hi, could you tell us what is the roadmap of crun project? It will replace the runc as the default runtime component in openshift?

from crun.

@onlyjob @giuseppe Should we update the readme and/or close this issue?

from crun.

@rhatdan I got it, and thank you for reply.

from crun.

I would love to see some changes to README please, as requested here: #154 (comment)

Thanks.

from crun.

I would love to see some changes to README please, as requested here: #154 (comment)

could you open a PR with the changes you'd like to add?

from crun.

Since no PR was generated I am going to close.

from crun.

@warmchang We have not made any decisions on that, at this point. Originally crun was for support for cgroupV2, but it also has some interesting features that runc does not, and @giuseppe is looking into adding additional features.

https://docs.openshift.com/container-platform/4.12/nodes/containers/nodes-containers-using.html#nodes-containers-runtimes
It seems to be working in this direction. 😄

from crun.