https://www.cloudlinux.com/ and https://en.wikipedia.org/wiki/CloudLinux_OS
What else do you need to know? CloudLinux is CentOS based and the best thing that happened to the hosting industry since cPanel. The ideia is that they isolate each cPanel account / customer from each other with very strict policies when it comes to resources, think kind of containerization but done in a better way for shared hosting.
They also have other products that include te ability to upgrade the kernel without reboots and a very solid kernel.
This might interest you: https://www.cloudlinux.com/getting-started-with-cloudlinux-os/40-stability-features/927-lve-manager-for-cpanel/?nab=0