Apache is running a threaded MPM, but your PHP Module is not compiled to be threadsafe. You need to recompile PHP.

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After installing Apache2, MySQL & PHP on Debian wheezy 7.1, I tried to reboot the apache server. It showed me the following error.
Starting web server: apache2[Fri Dec 27 11:29:16 2013] [crit] Apache is running a threaded MPM, but your PHP Module
is not compiled to be threadsafe. You need to recompile PHP.
Pre-configuration failed
Action 'start' failed.
The Apache error log may have more information.
failed!

So I searched through the internet to recomplie the PHP Source. But none of the tutorials were best and feasible.

Finally, after long try I found the command below that helped me to run the apache and PHP along.
apt-get install apache2-mpm-prefork

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6 thoughts on “Apache is running a threaded MPM, but your PHP Module is not compiled to be threadsafe. You need to recompile PHP.”

  1. I’m not entirely sure that enabling prefork is a solution, more like a bad workaround due to a really poor decision on the part of the Ubuntu devs to bundle PHP pre-compiled without thread support.

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