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After reading this answer, I decided to change httpd's MPM on my server to worker. But while editing /etc/sysconfig/httpd, I noticed this comment:

# The default processing model (MPM) is the process-based # 'prefork' model. A thread-based model, 'worker', is also # available, but does not work with some modules (such as PHP). # The service must be stopped before changing this variable. # #HTTPD=/usr/sbin/httpd.worker

I may be interpreting it wrong, but isn't it telling me that worker will not work with mod_php? Because that is what I am currently using.

The server runs CentOS 6.4 and Apache 2.2.

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  • You can't use mod_php with worker Commented Sep 3, 2013 at 19:37

2 Answers 2

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No - you can't - you'll have mysterious bugs and crashes as PHP isn't thread-safe.

But you can use worker-mpm for static files and something like php_fcgi or a reverse proxy to another httpd instance only for PHP.

I'm using the latter - it allows me to run multiple sites - all with different permissions and configs on CentOS 6.

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As far as I know, mod_php is not thread-safe.

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