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Fedora CoreOS isn't listed on the matrix but 38 is comparable with which RHEL version? https://www.suse.com/suse-k3s/support-matrix/all-supported-versions/k3s-v1-26/

I’m not 100 % sure. But, I would image RHEL 9? I noticed a couple of PRs from the repo: • https://github.com/k3s-io/k3s/pull/6945 • https://github.com/k3s-io/k3s/pull/7443 The first one introducing support for CoreOS, so I expected it to be supported somehow. Maybe I misread the pull request?

See https://en.wikipedia.org/wiki/Red_Hat_Enterprise_Linux#Relationship_with_Fedora_Linux . RHEL 9 came from Fedora 34

In conclusion, Fedora CoreOS 38 is currently not supported?

Fedora Core isn't supported period, which doesn't mean it's expected not to work, it means it's not tested and maybe it'll work or maybe it won't and no one from Rancher is likely to put more than a courtesy effort into making it work (things like answering general questions and passing along debugging tips & tricks). Fedora Core 34 as the basis of RHEL 9 is very likely to work on anything that supports RHEL 9. Fedora Core 38 is going to be down to degree of changes & luck.

k3s should work on any distro, but the selinux stuff is much more finicky because we’re dependent on the distro’s container-selinux package.

Makes sense. Thanks for taking the time to answer. 🙏🏻