[Cent OS] server reached MaxRequestWorkers setting, consider raising the MaxRequestWorkers setting

Open file /etc/httpd/conf/httpd.conf
Find </IfModule>
Add after:

Mã:<IfModule mpm_prefork_module>
      StartServers              10
      MinSpareServers           10
      MaxSpareServers           20
      MaxClients                4000
      MaxRequestWorkers         4000
      ServerLimit               5000
      MaxConnectionsPerChild    10000
</IfModule> 


Restart apache:
service httpd restart

Read more:
https://devops.ionos.com/tutorials/optimize-apache-performance-on-centos-7-1/
https://bobcares.com/blog/server-reached-maxrequestworkers-setting/