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The FreeBSD answer to containers is jails, but I'm not sure how the capabilities of jails maps to the functionality provided by cgroups.

Actually its the other way around.

FreeBSD Jails are here since year 2000 - 24 years ago.

The Linux answer to FreeBSD Jails is Docker - from 2014 - and later Podman.

Hope that helps.

Regards, vermaden

If the docker ecosystem can't be used, it's not even an answer.