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Fedora has preferred podman for a while, it's not unique to Fedora CoreOS. Much of that has to do with Docker's choices.

moby-engine https://koji.fedoraproject.org/koji/packageinfo?packageID=27...

docker https://koji.fedoraproject.org/koji/packageinfo?packageID=51...

podman https://koji.fedoraproject.org/koji/packageinfo?packageID=26...

> have disappeared like locksmith

Locksmith[0] implementation is tightly coupled to the specific update daemon, so it can't be directly re-used outside of Container Linux or without update-engine[1].

Its logic has been ported over to Zincati[2], which performs reboot management on top of rpm-ostree[3].

[0] https://github.com/coreos/locksmith

[1] https://github.com/coreos/update_engine

[2] https://github.com/coreos/zincati

[3] https://github.com/coreos/rpm-ostree

Last I heard Docker still doesn't support cgroups-v2, 4 years after it was merged into Linux.

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/lin...