Starting from version 2.4 apache offers 3 MPM we can choose, it’s depend in what you needs.
- prefork MPM uses multiple child processes without threading. Each process handles one connection at a time without creating separate threads for each.
- worker MPM uses several threads per child processes, where each thread handles one connection at a time.
- event MPM It is similar to the worker MPM in that it also creates multiple threads per child process but with an advantage: it causes KeepAlive or idle connections (while they remain in that state) to be handled by a single thread, thus freeing up memory that can be allocated to other threads. This MPM is not suitable for non-thread-safe modules like mod_php, to use event MPM, PHP-FPM must be used instead.
check the MPM used by your Apache:
2 | AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 202.74.43.187. Set the 'ServerName' directive globally to suppress this message |
3 | Server version: Apache/2.4.6 (CentOS) |
4 | Server built: Nov 19 2015 21:43:13 |
5 | Server's Module Magic Number: 20120211:24 |
6 | Server loaded: APR 1.4.8, APR-UTIL 1.5.2 |
7 | Compiled using: APR 1.4.8, APR-UTIL 1.5.2 |
11 | forked: yes (variable process count) |
12 | Server compiled with.... |
15 | -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled) |
16 | -D APR_USE_SYSVSEM_SERIALIZE |
17 | -D APR_USE_PTHREAD_SERIALIZE |
18 | -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT |
19 | -D APR_HAS_OTHER_CHILD |
20 | -D AP_HAVE_RELIABLE_PIPED_LOGS |
21 | -D DYNAMIC_MODULE_LIMIT=256 |
22 | -D HTTPD_ROOT="/etc/httpd" |
23 | -D SUEXEC_BIN="/usr/sbin/suexec" |
24 | -D DEFAULT_PIDLOG="/run/httpd/httpd.pid" |
25 | -D DEFAULT_SCOREBOARD="logs/apache_runtime_status" |
26 | -D DEFAULT_ERRORLOG="logs/error_log" |
27 | -D AP_TYPES_CONFIG_FILE="conf/mime.types" |
28 | -D SERVER_CONFIG_FILE="conf/httpd.conf" |
To change this, edit /etc/httpd/conf.modules.d/00-mpm.conf
and uncomment the line that loads mpm_event_module
1 | LoadModule mpm_event_module modules/mod_mpm_event.so |
install php-fpm, fcgi,mod_fcgid
change php handler in order to use php-fpm in /etc/httpd/conf.d/php.conf
2 | # SetHandler application/x-httpd-php |
restart/start all services
recheck the MPM used by your Apache:
2 | AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 202.74.43.187. Set the 'ServerName' directive globally to suppress this message |
3 | Server version: Apache/2.4.6 (CentOS) |
4 | Server built: Nov 19 2015 21:43:13 |
5 | Server's Module Magic Number: 20120211:24 |
6 | Server loaded: APR 1.4.8, APR-UTIL 1.5.2 |
7 | Compiled using: APR 1.4.8, APR-UTIL 1.5.2 |
10 | threaded: yes (fixed thread count) |
11 | forked: yes (variable process count) |
12 | Server compiled with.... |
15 | -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled) |
16 | -D APR_USE_SYSVSEM_SERIALIZE |
17 | -D APR_USE_PTHREAD_SERIALIZE |
18 | -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT |
19 | -D APR_HAS_OTHER_CHILD |
20 | -D AP_HAVE_RELIABLE_PIPED_LOGS |
21 | -D DYNAMIC_MODULE_LIMIT=256 |
22 | -D HTTPD_ROOT="/etc/httpd" |
23 | -D SUEXEC_BIN="/usr/sbin/suexec" |
24 | -D DEFAULT_PIDLOG="/run/httpd/httpd.pid" |
25 | -D DEFAULT_SCOREBOARD="logs/apache_runtime_status" |
26 | -D DEFAULT_ERRORLOG="logs/error_log" |
27 | -D AP_TYPES_CONFIG_FILE="conf/mime.types" |
28 | -D SERVER_CONFIG_FILE="conf/httpd.conf" |
create phpinfo if php handler using fpm/fastCGI now
1 | $ echo '<?php phpinfo(); ?>' > /var/www/html/info.php |
have fun 
