Converting RHEL 8-type distros to cgroup version 2
It's an easy matter to convert a Red Hat Enterprise Linux 8-type distro to cgroup Version 2. Step 1 is to edit the /etc/default/grub
file on your AlmaLinux machine. Find the line that starts with GRUB_CMDLINE_LINUX=
. At the end of that line, add systemd.unified_cgroup_hierarchy=1
. The whole line should now look like this:
GRUB_CMDLINE_LINUX="crashkernel=auto resume=/dev/mapper/vl-swap rd.lvm.lv=vl/root rd.lvm.lv=vl/swap rhgb quiet systemd.unified_cgroup_hierarchy=1"
Next, rebuild the GRUB
configuration, like this:
[donnie@localhost ~]$ sudo grub2-mkconfig -o /boot/grub2/grub.cfg
Reboot the machine, and then look in the /sys/fs/cgroup/
directory. You should now see the same filesystem that you see on the Fedora machine. However, don't be too disappointed if you can't get all of the previous labs to work. It's just that the RHEL 8-type distros all use an older version of the Linux kernel, which...