CloudLinux is a commercial operating system designed specifically for shared hosting environments and web hosting providers. It is built upon the Linux kernel and provides a range of features and tools to improve server stability, security, and resource isolation in multi-tenant hosting environments. Here are some key features and aspects of CloudLinux:

1. Resource Isolation: CloudLinux uses a technology called Lightweight Virtual Environment (LVE) to isolate resources (CPU, memory, I/O) for each tenant (website or user) on a shared server. This ensures that one user’s activities cannot adversely affect the performance or stability of other users’ websites or applications on the same server.

2. Security: CloudLinux includes security enhancements like CageFS, which is a virtualized file system that isolates each user’s files and prevents them from seeing or accessing other users’ data. This helps protect against various types of attacks and vulnerabilities.

3. Stability: It offers tools like PHP Selector and Node.js Selector that allow hosting providers to offer multiple versions of programming languages like PHP or Node.js to their customers. This can help ensure compatibility with a wide range of applications.

4. KernelCare: CloudLinux includes KernelCare, a service that provides automated kernel patching without the need to reboot the server. This helps keep the server up to date with security patches and reduces downtime.

5. LVE Manager: A web-based control panel that allows hosting providers to manage resource limits for individual users, monitor server resources, and set various hosting parameters.

6. Hardened Kernel: CloudLinux includes a customized and hardened kernel that adds security features to protect the server from various types of attacks.

7. Support: CloudLinux offers support services to hosting providers, ensuring they have access to assistance and updates.