[
http://issues.apache.org/jira/browse/MODPYTHON-158?page=comments#action_12373816
]
Graham Dumpleton commented on MODPYTHON-158:
--------------------------------------------
I have checked into subversion some new code to support a better
troubleshooting guide. The checks that the code does is as follows:
1. On initialisation of mod_python, will compare the version string from the
version of Python that mod_python was compiled against, with that which was
found at runtime. If they differ, it will log error messages like:
[Mon Apr 10 16:06:22 2006] [error] python_init: Python version mismatch,
expected '2.3.4', found '2.3'.
[Mon Apr 10 16:06:22 2006] [error] python_init: Python executable found
'/usr/bin/python'.
[Mon Apr 10 16:06:22 2006] [error] python_init: Python path being used
'/Users/grahamd/lib/python:/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python23.zip:/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/:/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/plat-darwin:/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/plat-mac:/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/plat-mac/lib-scriptpackages:/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/lib-tk:/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/lib-dynload'.
[Mon Apr 10 16:06:22 2006] [notice] mod_python: Creating 8 session mutexes
based on 6 max processes and 25 max threads.
[Mon Apr 10 16:06:22 2006] [notice] mod_python: using mutex_directory /tmp
[Mon Apr 10 16:06:22 2006] [notice] Apache/2.0.55 (Unix)
mod_python/3.3.0-dev-20060410 Python/2.3 configured -- resuming normal
operations
2. When it goes to import "mod_python.apache" when a request is first received,
if it cannot be found, it will dump out Python path that was used in the search:
[Mon Apr 10 16:10:09 2006] [error] make_obcallback: could not import
mod_python.apache.\n
ImportError: No module named mod_python.apache
[Mon Apr 10 16:10:09 2006] [error] make_obcallback: Python path being used
"['/Users/grahamd/lib/python',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python23.zip',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/plat-darwin',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/plat-mac',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/plat-mac/lib-scriptpackages',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/lib-tk',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/lib-dynload',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/PIL',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/PyObjC',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/ZopePageTemplates',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/py2app',
'/usr/local/src/reportlab_1_20', '/usr/local/src/trml2pdf',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/wx-2.6-mac-ansi']".
[Mon Apr 10 16:10:09 2006] [error] get_interpreter: no interpreter callback
found.
[Mon Apr 10 16:10:09 2006] [error] [client 127.0.0.1] python_handler: Can't
get/create interpreter.
A similar error error is logged where "mod_python.apache" can be imported but
an error occurred when doing so. This can happen when Apache module is 3.2+ and
Python module code files are 2.7.X.
[Mon Apr 10 16:13:15 2006] [error] make_obcallback: could not import
mod_python.apache.\n
Traceback (most recent call last):
File
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/mod_python/apache.py",
line 616, in ?
make_table = _apache.make_table
AttributeError: 'module' object has no attribute 'make_table'
[Mon Apr 10 16:13:15 2006] [error] make_obcallback: Python path being used
"['/Users/grahamd/lib/python',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python23.zip',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/plat-darwin',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/plat-mac',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/plat-mac/lib-scriptpackages',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/lib-tk',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/lib-dynload',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/PIL',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/PyObjC',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/ZopePageTemplates',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/py2app',
'/usr/local/src/reportlab_1_20', '/usr/local/src/trml2pdf',
'/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages/wx-2.6-mac-ansi']".
[Mon Apr 10 16:13:15 2006] [error] get_interpreter: no interpreter callback
found.
[Mon Apr 10 16:13:15 2006] [error] [client 127.0.0.1] python_handler: Can't
get/create interpreter.
3. If it was able to import "mod_python.apache" but a failure occurred when
calling "apache.init()", it will compare the version of the Apache mod_python
module load against the version of mod_python Python code files found. If the
version disagrees it will complain. This can occur where Apache module is 3.2+
but Python code files found are 3.1.X.
[Mon Apr 10 16:18:24 2006] [error] make_obcallback: could not call init.\n
TypeError: init() takes no arguments (2 given)
[Mon Apr 10 16:18:24 2006] [error] make_obcallback: mod_python version
mismatch, expected '3.3.0-dev-20060410', found '<unknown>'.
[Mon Apr 10 16:18:24 2006] [error] get_interpreter: no interpreter callback
found.
[Mon Apr 10 16:18:24 2006] [error] [client 127.0.0.1] python_handler: Can't
get/create interpreter.
Unfortunately though, and I onlly just realised, the version string in
mod_python/__init__.py file was only added in 3.2. :-(
All the same, all this extra information should hopefully be enough for people
to see there is a misconfiguration problem and work out what is missing or
wrongly installed.
I'll possibly tweak this a bit more. Suggestions of other stuff to output and
when, most welcome. For example, maybe should output __file__ from "mod_python"
module so know where module is being picked up from.
> Improve Installation / Troubleshooting section in documentation
> ---------------------------------------------------------------
>
> Key: MODPYTHON-158
> URL: http://issues.apache.org/jira/browse/MODPYTHON-158
> Project: mod_python
> Type: Improvement
> Components: documentation
> Versions: 3.3
> Environment: All
> Reporter: Jim Gallacher
> Priority: Minor
>
> Some of the more commonly asked questions asked on the mailing list relate to
> mod_python configuration issues that are not currently covered in the
> documentation.
> Apache can't load mod_python.so
> ---------------------------------------------
> This more common problem on Windows, but can occur on other platforms. A
> typical apache error message looks like this:
> Syntax error on line 173 of C:/Program Files/Apache
> Group/Apache2/conf/httpd.conf:
> Cannot load C:/Program Files/Apache
> Group/Apache2/modules/mod_python.so into server: The
> specified module could not be found.
> On Windows this may indicate a problem with missing D
> Nicolas offered the following as an explanation on Windows:
> """
> One of the possible cause of your problem is that Apache does find
> mod_python.so but not one of the DLL it relies on. Unfortunately the error
> reporting in this case is quite scarce and misguiding.
> The candidates missing DLLs are python24.dll and the Microsoft Runtime DLLS
> (normally msvcr71.dll and msvcp71.dll).
> Make sure that your Python directory and the runtime DLLs can be found on
> your PATH. The runtime DLLs are normaly copied in your Python directory, so
> putting the Python directory on your PATH variable should do the trick.
> Also, make sure that the user which is running Apache has its PATH variable
> properly set. The best way to do this is to define it at the system-wide
> level, but logging it under the user and defining the variable at the user
> level is also possible.
> """
> Apache can't load mod_python.so - undefined symbol
> -----------------------------------------------------------------------
> This may look similar to the first example, but indicates a deeper problem.
> Typical error message:
> httpd: Syntax error on line 231 of /usr/local/apache2/conf/httpd.conf: Cannot
> load /usr/local/apache2/modules/mod_python.so into server:
> /usr/local/apache2/modules/mod_python.so: undefined symbol:
> apr_sockaddr_port_get
> This error could indicate an actual bug in mod_python, or a mismatch between
> the Apache version used to compile mod_python versus the one being used to
> run it. I'm not sure there is an easy answer, but we should offer some
> initial troubleshooting suggestions.
> make_obcallback: could not import mod_python.apache
> --------------------------------------------------------------------------
> This one seems to occur on all platforms with similar frequency, and is
> usually related to having python multiple versions on the same system.
> Typical error message:
> [Sun Apr 09 14:03:46 2006] [error] make_obcallback: could not import
> mod_python.apache.\n
> [Sun Apr 09 14:03:46 2006] [error] python_handler: no interpreter
> callback found.
> [Sun Apr 09 14:03:46 2006] [error] [client 192.168.2.100]
> python_handler: Can't get/create interpreter., referer:
> http://localhost/mptest.py
> The solution is to adjust that PATH apache uses so it finds the correct
> python version. This will be platform specific.
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