Receiving a "508 Resource Limit Is Reached" error when browsing a site on CloudLinux

Symptoms

Receiving the following error when browsing an account's site on a CloudLinux Server:

508 Resource Limit Is Reached 
The website is temporarily unable to service your request as it exceeded resource limit. Please try again later.

Description 

The "508 Resource Limit is Reached" error is an error that appears when an account exceeds the resources assigned to it, which can include CPU usage, RAM usage, and/or concurrent processes for that account. This usually occurs when an account hits the allocated resource limit set in CloudLinux LVE Manager.

• Website traffic spikes - If your site experiences high peaks in inbound or outbound traffic it can exceed allocated resources.
• Problems in the site's code. If there are pages on your site that have speed issues, an increase in inbound traffic or concurrent page requests can push the site over its resource limits.
• Backend operations – demanding backend operations such as imports and exports can create significant load, which in addition to normal traffic can cause resource limits to be exceeded.
• Webcrawlers making a high number of requests per second.

Workaround

You can fix this error by increasing the resources assigned to the account or reducing the amount of resources the account is using in order to ensure it does not hit its resource limit in the future.

You can read more about changing resource allocation in CloudLinux LVE Manager here:

https://support.cpanel.net/hc/en-us/articles/360052233674-How-do-I-adjust-the-limits-for-my-user-