ISSUE 1:
In ubuntu20, centos8 and almalinux8:
root@host:~# grep cgroup /proc/filesystemsnodev cgroup
nodev cgroup2
In centos7:
root@centos:~# grep cgroup /proc/filesystems
nodev cgroup
nodev cgroup
In my centos 7, command 'grep cgroup /proc/filesystems' does not output "nodev cgroup2". Does this mean cgroups v2 is not supported in it and cannot be enabled in it?
ISSUE 2:
In my ubuntu20, centos8 and alma8 server, I enable cgroups v2 by:
1. adding "systemd.unified_cgroup_hierarchy=1" to GRUB_CMDLINE_LINUX in /etc/default/grub,
2. executing the command "grub2-mkconfig" or "update-grub" as root and then
3. reboot the server.
Without reboot, cgroups v2 does not come into effect when i check using the below command:
root@host:~# stat -fc %T /sys/fs/cgroup/
tmpfs
tmpfs
Is there a way this can be done without a reboot? I am looking for a way to enable cgroups v2 which should n't need a reboot.
