Tuning Apache 2.4.6(MaxClients, MaxServers etc) on CentOS7

Reference

https://www.linode.com/docs/websites/apache-tips-and-tricks/tuning-your-apache-server

[root@localhost ~]# cat /etc/centos-release CentOS Linux release 7.2.1511 (Core) [root@localhost ~]# yum install httpd -y [root@localhost ~]# httpd -version Server version: Apache/2.4.6 (CentOS) Server built:   Nov 19 2015 21:43:13

confirm which multi processing module(prefork, worker, event) Apache loads.

In my case, Apache loads prefork module.

# httpd -V AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain. Set the 'ServerName' directive globally to suppress this message Server version: Apache/2.4.6 (CentOS) Server built:   Nov 19 2015 21:43:13 Server's Module Magic Number: 20120211:24 Server loaded:  APR 1.4.8, APR-UTIL 1.5.2 Compiled using: APR 1.4.8, APR-UTIL 1.5.2 Architecture:   64-bit Server MPM:     prefork  threaded:     no    forked:     yes (variable process count) Server compiled with.... [root@localhost ~]# httpd -M | grep prefork AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain. Set the 'ServerName' directive globally to suppress this message mpm_prefork_module (shared) [root@localhost ~]# grep -v ^# /etc/httpd/conf.modules.d/00-mpm.conf | grep -v ^$ LoadModule mpm_prefork_module modules/mod_mpm_prefork.so

edit httpd.conf

[root@localhost ~]# tail -10 /etc/httpd/conf/httpd.conf IncludeOptional conf.d/*.conf <IfModule mpm_prefork_module>  StartServers       100  MinSpareServers    100  MaxSpareServers    100  MaxClients         512  ServerLimit 512  MaxRequestsPerChild  1000 </IfModule>

restart httpd to reflect that.

[root@localhost ~]# systemctl restart httpd.service