In the next stream release on the week of April 12, new nodes will use
cgroups v2 by default. Upgrading systems will remain on cgroups v1.
All built-in container applications (podman, moby-engine, and
crun/runc) in the next stream are now cgroups v2 capable (as of
`34.20210328.1.1`).
Over the coming months, our testing and stable streams will begin to
use cgroups v2 for newly deployed nodes. The default change to cgroups
v2 for `stable` will happen on or after the week of June 7th. Please
test.
If you'd like to remain on cgroups v1 when deploying new nodes you can
follow this example:
https://docs.fedoraproject.org/en-US/fedora-coreos/kernel-args/#_example_st….
If you'd like to opt-in early to cgroups v2 when deploying new nodes
on the testing and stable streams, you can follow this example:
https://docs.fedoraproject.org/en-US/fedora-coreos/kernel-args/#_example_mo….
Note that `moby-engine` in these streams is not yet cgroups v2 capable
(requires Fedora 34 base).
If you'd like to opt-in to cgroups v2 on currently running nodes you
may directly use `rpm-ostree kargs` as described in this example:
https://docs.fedoraproject.org/en-US/fedora-coreos/kernel-args/#_removing_e….
Thanks,
Jonathan Lebon, for the Fedora CoreOS team
