RAM and CPU are not available in Resource Controller (cgroups) on Debian 8.
Bug in Debian 8: its kernel does not support the cgroups CPU and RAM resource usage.
Note: This article is intended for use by server administrators. In case there is no administrative SSH access to the server, contact the server administrator or server provider.
As a workaround, install the newer kernel version from the debian-backports repository:
Connect to the server using SSH.
Enable debian-backports repo:
# echo deb http://http.debian.net/debian jessie-backports main > /etc/apt/sources.list.d/jessie-backports.list
Run the following commands to update kernel:
# apt-get update
# apt-get -t jessie-backports install linux-image-amd64
/etc/default/grubin any text editor and set the following parameters:
Reboot the server