Introduction

• What is CloudLinux
• CloudLinux life cycle
• Description of CloudLinux components

What is CloudLinux

CloudLinux is designed for shared hosting providers. It isolates each customer into a separate “Lightweight Virtualized Environment” (LVE), which allocates and limits server resources, like memory, CPU and the number of simultaneous connections, for each web hosting tenant. This ensures that tenants cannot jeopardize the stability of your servers, causing all sites to slow down or even come to a halt. CloudLinux OS also “cages” tenants from one another to avoid security breaches. This way, unstable scripts or malware are not able to sprawl across your customer sites, causing severe harm.

CloudLinux life cycle

CloudLinux supports the same life cycle policy as RHEL. Using a supported operating system is critical to maintaining a stable server environment.

Currently, the following version are supported:

Operating System	Release Date	End of Life and Support
CloudLinux 8	Mar 17, 2020	May 31, 2029
CloudLinux 7	Apr 1, 2015	Jun 30, 2024
CloudLinux 6	Feb 1, 2011	Nov 30, 2020 (Extended Support until June 30, 2024)

Description of CloudLinux components

• LVE Manager

  LVE is a Lightweight Virtualized Environment. LVE Manager allows you to maintain fine-tuned control over your resources, including CPU, IO rate, memory, inodes, numbers of processes, and concurrent connections, that any single account can use. Now you can limit resource abuse, while allowing good customers to use what they need.

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• CageFS

  CageFS is a virtualized, per-user file system that uniquely encapsulates each customer, 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 completely transparent to your customers, without any need for them to change their scripts.

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• MySQL Governor

  MySQL Governor tracks CPU and disk IO usage for every user in real time and throttles MySQL queries by using LVE limits. By using the dbtop utility, it is possible to see the database usage on a per-customer basis, ensuring that the system admin always know what is going on.

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• PHP Selector

  PHP Selector allows end users to select the specific version of PHP they need. It allows ultimate flexibility by offering all popular versions of PHP, with more than 120 PHP extensions to choose from.

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• Ruby Selector

  Ruby Selector allows end users to choose the Ruby version for applications and install additional modules to the application environment. Ruby Selector uses mod_passenger for delivering optimum performance.

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• Python Selector

  Python Selector allows end users to choose the Python version for applications and install additional modules. Python Selector uses mod_passenger to get the best performance from Python applications.

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• Node.js Selector

  Node.js Selector is a CloudLinux component that allows each user to easily create Node.js applications, choose Node.js version and other parameters for applications based on their needs.

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• Apache mod_lsapi PRO

  Mod_lsapi PRO is the fastest PHP handler for Apache. It is a drop-in replacement for SuPHP, FCGID, RUID2, and ITK. It has a low memory footprint and understands .htaccess PHP directives.

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• Reseller limits

  Reseller limits is a feature that allows hosters to set limits for the resources each Reseller can operate with. Server admin also provides controls on what resources each end user will have. Reseller limits set by a hoster limit the total amount of resources resellers’ end users can consume altogether.

  When a hoster has set reseller limits for the particular reseller he provides the reseller with an ability to set limits for his end users within the Reseller Interface.

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• LVE-stats 2

  LVE-stats 2 collects LVE usage statistics (CPU, memory, disk space usage) and allows to collect the usage data.

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