Apache 2 mpm-itk and mpm-prefork modules together

estus asked:

Here is Apache 2 configuration:


# Depends: mpm_prefork
LoadModule mpm_itk_module /usr/lib/apache2/modules/mpm_itk.so


# Conflicts: mpm_event mpm_worker mpm_itk
LoadModule mpm_prefork_module /usr/lib/apache2/modules/mod_mpm_prefork.so

The comments don’t add much clarity – mpm-prefork conflicts with mpm-itk, but mpm-itk depends on it?

When /etc/apache2/mods-enabled/mpm_itk.load is removed, there is an error:

AH00534: apache2: Configuration error: No MPM loaded.

I’m not sure what’s going on there. Is mpm-itk broken or does it really depend on mpm-prefork?

Is it bad that both modules are loaded? Which of these modules is used by Apache in practice and why? How to make Apache use another one?

My answer:

You can only use one MPM. So the comment doesn’t make any sense. You might consider reporting the problem to the package maintainer.

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