CloudLinux is an operating system specifically designed for hosting companies and optimized for shared hosting. This OS brings a lot of benefits by allowing you to improve stability, density, security, and performance of the server. With CloudLinux, you can Cage each customer in an individual virtual system and limit the amount of resources any single account can use in the system. 

Cloudlinux OS SHARED version is used for integration with ISPmanager. 

CloudLinux features:

  • LVE (Lightweight Virtual Environment) — this technology allows you to limit user access to system resources (CPU, I/O, Memory);
  • CageFS — a virtualized file system and a set of tools to contain each user in its own 'cage'. Learn more in the article CloudLinux limits;
  • LSAPI — the Apache module that allows using the mode PHP as LSAPI. Learn more in PHP modes on CloudLinux.

Learn more in official documentaion.