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pct: clarify needed systemd-versions for cgroupv2 support

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versions determined through systemd's changelog, and a few empiric
tests.

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
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Stoiko Ivanov 2021-07-01 11:28:54 +02:00 committed by Thomas Lamprecht
parent 34f3e48131
commit c80d381a17
1 changed files with 11 additions and 2 deletions
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@ -518,8 +518,17 @@ Another important difference is that the 'devices' controller is configured in a
completely different way. Because of this, file system quotas are currently not
supported in a pure 'cgroupv2' environment.
If file system quotas are not required and the containers are new enough to
understand 'cgroupv2', it is recommended to stick to the new default.
'cgroupv2' support by the container's OS is needed to run in a pure 'cgroupv2'
environment. Containers running 'systemd' version 231 or newer support
'cgroupv2' footnote:[this includes all newest major versions of container
templates shipped by {pve}], as do containers not using 'systemd' as init
system footnote:[for example Alpine Linux].
NOTE: CentOS 7 and Ubuntu 16.10 are two prominent Linux distributions, which
have a 'systemd' version that is too old to run in a 'cgroupv2' environment.
If file system quotas are not required and the containers support 'cgroupv2',
it is recommended to stick to the new default.
To switch back to the previous version the following kernel command line
parameter can be used: