CloudLinux
From Atomicorp Wiki
ASL works with Cloudlinux.
Cloudlinux uses an older version of the Linux kernel, and its modifications to the kernel not compatible with modern Linux kernels, such as the one that ASL includes.
Therefore, if you use Cloudlinux, you will currently need to use the kernel that is supplied with Cloudlinux and not the secure ASL kernel to make use of CloudLinux's kernel features.