From c80d381a17ae9ee0658d30fdcd4f9eda154bd2e6 Mon Sep 17 00:00:00 2001 From: Stoiko Ivanov Date: Thu, 1 Jul 2021 11:28:54 +0200 Subject: [PATCH] pct: clarify needed systemd-versions for cgroupv2 support versions determined through systemd's changelog, and a few empiric tests. Signed-off-by: Stoiko Ivanov --- pct.adoc | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/pct.adoc b/pct.adoc index b03b6ba..42826bd 100644 --- a/pct.adoc +++ b/pct.adoc @@ -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: