systemd enabling cgroup v2 by default (default-hierarchy=unified)

[gerard.bigot at gmail.com]

Hello all,

this :

switching to the "unified" cgroup hierarchy (cgroupv2) by
> default
>


> If for some reason you need to keep the legacy cgroup v1 hierarchy, you
> can select it via a kernel parameter at boot time:
> systemd.unified_cgroup_hierarchy=0


is a candidate for the 21.10 release note, I think.

Kind regards,
Gerard


Le mar. 17 août 2021 à 11:19, Lukas Märdian <slyon at ubuntu.com> a écrit :

> Hi all,
>
> After delaying this for a long time, we want to follow upstream, Debian
> and others in switching to the "unified" cgroup hierarchy (cgroupv2) by
> default:
> https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/1850667
>
> As discussed with the snapd and release teams, the next systemd upload
> will land this change (before FeatureFreeze). We expect some minor
> outfall in the proposed migration (wrt. snapd), that should be mitigated
> via https://github.com/snapcore/snapd/pull/10589 and resolved later this
> cycle once the full snapd cgroup v2 support is landed:
>
> https://github.com/snapcore/snapd/pulls?q=is%3Apr+is%3Aopen+label%3Acgroupv2
>
> If for some reason you need to keep the legacy cgroup v1 hierarchy, you
> can select it via a kernel parameter at boot time:
> systemd.unified_cgroup_hierarchy=0
>
> Cheers,
>    Lukas
>
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