# Introduction to CloudLinux OS

• CloudLinux OS editions
  • CloudLinux OS Solo
  • CloudLinux OS Admin
  • CloudLinux OS Shared (Pro)
• CloudLinux OS components
• CloudLinux OS life cycle

# CloudLinux OS editions

* Only inodes limits are available.

** LVE limits are disabled by default.

*** Python/Node.js/Ruby Selectors are available only for cPanel, DirectAdmin servers, and servers with custom panel with own integration.

# CloudLinux OS components

CloudLinux Manager

LVE is a Lightweight Virtualized Environment. CloudLinux 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 OS component that allows each user to easily create Node.js applications, choose Node.js versions 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. The 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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# CloudLinux OS life cycle

CloudLinux OS follows the life cycle policy of RHEL. Using a supported operating system is critical to maintaining a stable server environment.

Currently, the following versions are available and supported: