How can I change from prefork to worker MPM on CentOS 64bit?

Question

I'm running CentOS 64 bit, and just found out I am running prefork MPM on my dual quad Xeon. I was told worker will give me lower memory usage and higher performance, since I run a very high traffic website.

If this is true, how do I do it?

score 27 · Accepted Answer · answered Jan 11 '11 at 09:51

27

Edit: /etc/sysconfig/httpd

Uncomment:

HTTPD=/usr/sbin/httpd.worker

Restart, voila!

answered Jan 11 '11 at 09:51

Rafiq Maniar

1,120
9
15

Hi @RafiqManiar, by restart do you mean Apache or the whole server here? – ericn Feb 25 '13 at 05:04
4

Restart apache. sudo service httpd restart – Rafiq Maniar Feb 25 '13 at 08:31
2

CentOS 7. i am getting this: /usr/sbin/apachectl: line 137: /usr/sbin/httpd.worker: No such file or directory – YumYumYum Jun 12 '15 at 08:26

score 8 · Answer 2 · answered Jun 12 '15 at 08:32

8

CentOS 6x:

modify file: /etc/sysconfig/httpd

HTTPD=/usr/sbin/httpd.worker

CentOS 7x:

$ cat /etc/httpd/conf.modules.d/00-mpm.conf

    #LoadModule mpm_prefork_module modules/mod_mpm_prefork.so
    LoadModule mpm_worker_module modules/mod_mpm_worker.so
    #LoadModule mpm_event_module modules/mod_mpm_event.so

Restart

answered Jun 12 '15 at 08:32

YumYumYum

255
3
11

1

From the file /etc/sysconfig/httpd for apache 2.4 # Note: With previous versions of httpd, the MPM could be changed by # editing an "HTTPD" variable here. With the current version, that # variable is now ignored. The MPM is a loadable module, and the # choice of MPM can be changed by editing the configuration file # /etc/httpd/conf.modules.d/00-mpm.conf. – Vladimir Kornea Oct 21 '17 at 23:54

score 4 · Answer 3 · edited Nov 25 '12 at 22:41

Edited: /etc/sysconfig/httpd

And uncommented:

HTTPD=/usr/sbin/httpd.worker

After restarting httpd (service httpd restart) I get the following error:

Stopping httpd:                                            [  OK  ]
Starting httpd: httpd.worker: Syntax error on line 222 of /etc/httpd/conf/httpd.conf: Syntax error on line 9 of /etc/httpd/conf.d/php.conf: Cannot load /etc/httpd/modules/libphp5-zts.so into server: /etc/httpd/modules/libphp5-zts.so: cannot open shared object file: No such file or directory
                                                           [FAILED]

You might need to install php-zts though.

yum install php-zts

After that no more error messages and httpd is starting normally with module worker active.

score -2 · Answer 4 · answered Jan 13 '16 at 23:07

-2

-- Redhat Enterprise Linux 6

php-zts in RHEL is found in the "optional" repository:

# subscription-manager repos --enable rhel-6-server-optional-rpms
Repository 'rhel-6-server-optional-rpms' is enabled for this system.
# yum install php-zts

answered Jan 13 '16 at 23:07

RyanM

41
4

How can I change from prefork to worker MPM on CentOS 64bit?

4 Answers4