Sites slow or not loading: please increase LSAPI_CHILDREN

Symptoms

Some sites load slowly or do not load, and errors similar to the following can be seen in Apache's error_log and stderr.log logs, respectively.

2022-02-08 16:27:52.002950 [INFO] [26969] [T0] [203.0.113.2:38788#APVH_domain.tld] connection to [uds://tmp/lshttpd/APVH_eema_Suea-php74.sock] on request #0, confirmed, 0, associated process: 0, running: 0, error: Resource temporarily unavailable!

[UID:2355][254905] Reached max children process limit: 10, extra: 30, current: 40, busy: 40, please increase LSAPI_CHILDREN.

Description

This issue occurs when a domain hits LiteSpeed's max children process limit. LiteSpeed's "PHP suEXEC Max Conn" setting must be increased to address this issue.

Workaround

1. Log into WHM as the 'root' user.
2. Navigate to "Home / Plugins / LiteSpeed Web Server Plugin."
3. Click "LiteSpeed Configuration."
4. Open the "WebAdmin Console."
5. Click the "Configuration" icon.
6. Click the "Server" tab.
7. Click the "General" tab.
8. Scroll down to the "Using Apache Configuration File" section.
9. Click "Edit" to the right of "Using Apache Configuration File."
10. Modify the "PHP suEXEC Max Conn" value as needed.
11. Click "Save."
12. Click "Graceful Restart" at the top of the page.

Additional resources

LSPHP Options

Tuning: PHP suEXEC Max Conn