CentOS 6 EOL, CloudLinux 6 OS, and you!

Question

How can I upgrade cPanel if I am using CentOS 6?

If you're reading this guide, you probably have a server where you're getting the following error message after a cPanel update failed:

[2020-05-26 16:55:38 +0000] E Blocker found: Newer releases of cPanel & WHM
 are not compatible with your operating system. Upgrade your OS, or use 
the Update Preferences screen to select a Long-Term Support release for 
use with your OS. Starting with version 88, cPanel & WHM supports 64-bit 
versions of CentOS 7+, Red Hat Enterprise Linux 7+, and CloudLinux® 6+ only. 
Please see our OS End of Life policy for more information.

This means you are using the CentOS 6 operating system on your cPanel server, which last received full updates in May 2017. 

Answer

In order to update to a newer version of cPanel, you will be required to migrate to a server running a currently supported Operating System. You can find a current list of cPanel's supported Operating Systems here:

What operating systems are supported by cPanel?

 If you can't perform a full migration at this time, you can purchase and install CloudLinux on your CentOS 6 machine, and that will allow you to continue to receive updates and update the cPanel software.  We offer those licenses directly through our store here:

cPanel Store: CloudLinux Extension

Just make sure to choose the "CloudLinux for cPanel" option from the dropdown menu. Once the license is purchased, you can use the installation guide here to get that set up on your machine:

CloudLinux: Converting CentOS server with cPanel

You can find more details about this in our blog post here:

cPanel Blog: CentOS 6 EOL, CloudLinux 6 OS, and you!

CloudLinux 6 is only supported by cPanel up to v110.0.50. In order to upgrade past this point, you would need to look at upgrading to a more recent operating system.