Change Apache Server MPM in RHEL 8

Apache on RHEL 8 uses events MPM. You can use apachectl -V command to see the current MPM used by Apache.

[root@ok ~]# apachectl -V
Server version: Apache/2.4.37 (AlmaLinux)
Server built: Jan 25 2022 20:48:49
Server’s Module Magic Number: 20120211:83
Server loaded: APR 1.6.3, APR-UTIL 1.6.1
Compiled using: APR 1.6.3, APR-UTIL 1.6.1
Architecture: 64-bit
Server MPM: event
threaded: yes (fixed thread count)
forked: yes (variable process count)
Server compiled with….
-D APR_HAS_SENDFILE
-D APR_HAS_MMAP
-D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
-D APR_USE_SYSVSEM_SERIALIZE
-D APR_USE_PTHREAD_SERIALIZE
-D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
-D APR_HAS_OTHER_CHILD
-D AP_HAVE_RELIABLE_PIPED_LOGS
-D DYNAMIC_MODULE_LIMIT=256
-D HTTPD_ROOT=”/etc/httpd”
-D SUEXEC_BIN=”/usr/sbin/suexec”
-D DEFAULT_PIDLOG=”run/httpd.pid”
-D DEFAULT_SCOREBOARD=”logs/apache_runtime_status”
-D DEFAULT_ERRORLOG=”logs/error_log”
-D AP_TYPES_CONFIG_FILE=”conf/mime.types”
-D SERVER_CONFIG_FILE=”conf/httpd.conf”
[root@ok ~]#

To modify Apache MPM, edit file

You can enable the PMP you want to use, comment out other MPM.

For example to enable Prefork, uncomment the line

and comment the following line

Once modified, restart Apache with

Veirfy Apache MPM changed to prefork with command