Skip to content

CloudLinux (Service Customization) Guide

What is CloudLinux?

CloudLinux OS is the leading platform for multi-tenancy. It improves server stability, density, and security by isolating each tenant (cPanel client accounts) and giving them allocated server resources.

What is CloudLinux Good for?

CloudLinux isolates each customer into a separate “Lightweight Virtualized Environment” (LVE), which partitions, allocates, and limits server resources, like memory, CPU, and connections, for each account. CloudLinux OS also “cages” each account from one another to avoid security breaches. This way, unstable scripts or malware are not able to sprawl across different website.

How to Select Different PHP Version for Different cPanel Accounts

Smart SEO Hosting's cPanel offering is based on CloudLinux which allows complete resource isolation for each one of your cPanel accounts.

The following video demonstrates how you can quickly change the PHP version of your websites to your liking.

Enable and Modify Different PHP Extensions and Options (Per Account)

PHP Extensions

You can simply enable or disable different PHP extensions on a per domain basis.

Modify PHP Options

Same as PHP extensions, you may easily change different PHP option and parameters.

How to Check if a site has been limited by Cloud Linux?


  1. Log into your cpanel, either through the WHM reseller account or directly.
  2. Click on the Resource Usage icon under the Logs section.
    • From there, you will be able to see if your website was limited. You will see an indication such as: CPU resources were limited for your site or Memory resources were limited for your site.
  3. Click on [Details].
    • You will be able to see indepth details on why your site was slowed down. Any values in RED will indicate that you exceeded the limit, which is what caused the slow down