LVE load fail: could not insert 'kmodlve': Cannot allocate memory

Issue

• LVE Module cannot be loaded with error

  modprobe: ERROR: could not insert 'kmodlve': Cannot allocate memory

• dmesg contains error

  LVE: [53551] mount_cgroup_root_fs: failed to mount cgroup(memory), rc=-16

• The command below return cgroup2fs

  # stat -fc %T /sys/fs/cgroup/
  cgroup2fs

• No systemd.unified_cgroup_hierarchy=0 systemd.legacy_systemd_cgroup_controller in /proc/cmdline

Environment

• CloudLinux 
• tuned-profiles-cloudlinux >= 0.2-5
• LVE

Solution

1. Edit the file /etc/default/grub:
   Change systemd.unified_cgroup_hierarchy=1 to systemd.unified_cgroup_hierarchy=0 in the file
   
   
2. Regenerate the grub configuration
   

   grub2-mkconfig -o /etc/grub2.cfg
   grub2-mkconfig -o /etc/grub2-efi.cfg
   grub2-mkconfig -o /boot/grub2/grub.cfg
   grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg
   grub2-mkconfig -o /boot/efi/EFI/almalinux/grub.cfg

3. Reboot the server.

Also the problem can related to a specific tuned profile set before the cldeploy.

Please set to the correct one:

tuned-adm profile cloudlinux-default

We are going to release the next version of tuned-profiles-cloudlinux 0.2-7 to automate the switching of the profile to ours.

Cause

Cgroups v2 is not supported by kmodlve.