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systemd: switch to unified cgroup hierarchy by default

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See https://www.redhat.com/sysadmin/fedora-31-control-group-v2 for
details on why this is desirable, and how it impacts containers.

Users that need to keep using the old cgroup hierarchy can re-enable it
by setting `systemd.unifiedCgroupHierarchy` to `false`.

Well-known candidates not supporting that hierarchy, like docker and
hidepid=… will disable it automatically.

Fixes #73800
This commit is contained in:
Florian Klink
2020-11-17 21:54:26 +01:00
parent e949d75899
commit d22b3ed4bc
5 changed files with 32 additions and 3 deletions
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13
nixos/doc/manual/release-notes/rl-2103.xml
View File

@@ -264,6 +264,19 @@
<literal>unbound-control</literal> without passing a custom configuration location.
</para>
</listitem>
<listitem>
<para>
NixOS now defaults to the unified cgroup hierarchy (cgroupsv2).
See the <link xlink:href="https://www.redhat.com/sysadmin/fedora-31-control-group-v2">Fedora Article for 31</link>
for details on why this is desirable, and how it impacts containers.
</para>
<para>
If you want to run containers with a runtime that does not yet support cgroupsv2,
you can switch back to the old behaviour by setting
<xref linkend="opt-systemd.enableUnifiedCgroupHierarchy"/> = <literal>false</literal>;
and rebooting.
</para>
</listitem>
</itemizedlist>
</section>
</section>