Overview

CageFS is one of the core features of CloudLinux. It is a virtualized, per-user file system that uniquely encapsulates each cPanel users, preventing users from seeing each other and viewing sensitive information. CageFS prevents a large number of attacks, including most privilege escalation and information disclosure attacks. It is design to add security to cPanel-based shared hosting environment.

With CageFS

• Users only have access to safe files.
• Users cannot see other users and have no way to detect the presence of other users or user names on the server.
• Users cannot see server configuration files, like Apache config files.
• Users have a limited view of their own processing file system, and cannot see other users’ processes.

Overview

CloudLinux was released to the market in 2010. Today, it is a must-have for any web host who cares about stability, security, and churn. It is used by more than 2,000 hosting companies on 20,000+ servers. CloudLinux is interchangeable with CentOS so any SysAdmin will feel right at home. Yet, it was specifically optimized for shared hosting. Web hosts that use CloudLinux report higher uptime, significant improvements in density (as much as 5x), 4x decrease in number of reboots, and 10x decrease in number of account suspension they have to perform. It has also produced a significant decrease in churn for a number of customers.

The software specifically made for web hosts running cPanel control panel with multiple accounts. If you are a shared host, or a design company that has to host sites on behalf of the client – CloudLinux is your friend.

CloudLinux + cPanel =

• Improved stability by limiting the resources any single user can consume
  In shared hosting, the most common reason for downtime is a single account slowing down other accounts on the server. Using cPanel & WHM software with CloudLinux utilizes innovative Lightweight Virtual Environment (LVE) technology, improving the density and stability of your shared hosting environment for all tenants.
• Advanced server security
  With unique CageFS technology, CloudLinux encapsulates each customer, preventing users from seeing each other and viewing sensitive information. It also prevents a large number of attacks, including most privilege escalation and information disclosure attacks.
• Increased server efficiency
  By monitoring and containing resource spikes, CloudLinux eliminates the need to leave server resources idle, providing you with the ability to host twice as many accounts on your cPanel & WHM server.
• Multiple PHP versions
  Using CloudLinux together with cPanel & WHM software gives your customers with the flexibility to choose the PHP version that they need.
• Hardened kernel
  The shared hosting environment is unlike any other and the CloudLinux kernel takes that into account. It can protect against symlink attacks and trace exploits, while restricting the visibility of ProcFS to only what is necessary — making your cPanel & WHM servers more secure.

reference: https://blog.cpanel.com/what-is-cloudlinux/