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mod_wsgi incompatible with mod_python

April 7th, 2010 by George Notaras

This is a quick note that mod_wsgi daemon processes are now incompatible with mod_python. Upgraded mod_wsgi earlier today in CentOS and saw the following note. I guess this limitation has been around for a while before affecting CentOS/RHEL:

#################################################################################
# mod_python and mod_wsgi compatibility note
#################################################################################
# mod_wsgi will deadlock if run in daemon mode while mod_python is enabled
# do not enable both mod_python and mod_wsgi if you are going to use the
# WSGIDaemonProcess directive
# In previous version of mod_wsgi, apache would segfault when both mod_wsgi
# and mod_python were enabled.  This update does not guarantee that will not
# happen.
#################################################################################
# Do not enable mod_python and mod_wsgi in the same apache process.
#################################################################################

Keep this in mind if you plan to mix both modules under the same Apache instance.

Update: As Graham pointed out in this comment, there is no issue if mod_python 3.3.1 is used. That’s great news because I would miss the flexibility of mod_python when it comes to request processing.

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2 Responses to “mod_wsgi incompatible with mod_python”

  1. Graham Dumpleton Says :
    April 8th, 2010 at 1:13 am

    If this is the case it is only true if you are using an ancient mod_python version. If you are using mod_python 3.3.1 there is no issue. Unfortunately RHEL/CentOS distributions do I believe still carry an older mod_python version. Read ‘http://code.google.com/p/modwsgi/wiki/InstallationIssues#Incompatible_ModPython_Versions’ for more information.

  2. George Notaras Says :
    April 8th, 2010 at 4:31 am

    Hi Graham. You are right. Thanks for the clarification. I have updated the post.

    BTW, CentOS and RHEL use mod_python v3.2.8 and mod_wsgi v3.2.

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