mod_wsgi incompatible with mod_python

2 Comments

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.

mod_wsgi incompatible with mod_python by George Notaras is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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About George Notaras

George Notaras is the editor of the G-Loaded Journal, a technical blog about Free and Open-Source Software. George, among other things, is an enthusiast self-taught GNU/Linux system administrator. He has created this web site to share the IT knowledge and experience he has gained over the years with other people. George primarily uses CentOS and Fedora. He has also developed some open-source software projects in his spare time.

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2 responses on “mod_wsgi incompatible with mod_python”

  1. Graham Dumpleton Permalink →

    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 Post authorPermalink →

    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.