The Apache HTTP Server Project is an effort to develop and maintain an open- source HTTP server for modern operating systems including UNIX and Windows. Save the date! Essentials¶. Download! About · License · FAQ · Security Reports. Source Repositories¶. General Information · Trunk · · Documentation¶. Configuration files which load modules are now placed in the /etc/httpd/conf. modules.d/ directory. Packages that provide additional loadable modules for httpd.
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This document details various such checks that can be made. If you are reading this document because you have been directed here from the mailing list, then ensure that you actually provide the full amount of detail obtained from the checks and not leave out information. When you leave out information then it means guesses have to be made about your setup which makes it harder to debug your problems.
Information related to what version of Apache is being used and how it is built is obtained in a number of ways. The main such option is the -V option.
Although this has a section which appears to indicate what preprocessor options the server was compiled with, it is a massaged list. The contents of the file is:. Not only does this indicate what features of Apache have been compiled in, it also indicates by way of the –enable-layout option what custom Apache installation layout has been used. Modules can be loaded into Apache statically, or can be loaded dynamically at run time based on Apache configuration files.
To verify what exactly what is compiled in statically, you can use the -l option to the Apache executable. This is actually the Apache module that handles the task of dynamically loading other Apache modules. For a specific Apache configuration, you can determine what Apache modules will be loaded dynamically by using the -M option for the Apache executable. The names reflect that which would have been used with the LoadModule line in the Apache configuration and not the name of the module file itself.
Because Apache is a multi process server, it needs to use a global cross process mutex to control which of the Apache child processes get the next chance to accept a connection from a HTTP client. This cross process mutex can be implemented using a variety of different mechanisms and exactly which is used can vary based on the operating system.
Apache 2.2.15 released
Which mechanism is used can also be overridden in the Apache configuration if absolutely required. By default, the Apache configuration files would not specify a specific mechanism, and instead which is used would be automatically selected by the underlying Apache runtime libraries based on various build time and system checks about what is the prefered mechanism for a particular operating system.
Which mechanism is used by default can be httpr from the build information displayed by the -V option to the Apache executable described previously. If the AcceptMutex directive is defined in the Apache configuration file, then what ever mechanism is specified will be used instead for Apache child processes. Provided that Apache 2. In the case of Apache 2.
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Either way, you should check the Apache configuration files as to whether either AcceptMutex or WSGIAcceptMutex directives are used as they will override the defaults calculated above. Under normal circumstances neither should be set as focs would always be used. If wanting to look httpdd overriding the default mechanism, what options exist for what mechanism can be used will be dependent on the operating system being used.
There are a couple of ways this can be determined. To do this, in turn, add entries into the Apache configuration files, at global scope of:. For each run the -t option on the Apache program executable.
Index of /dist/httpd/docs
Docz that environment variable may be defined in your user account, it will not dos be defined in the environment of the account that Apache htgpd up as.
For the case of it not being found, Apache will fail to start. For where it is found but it is a different installation to that which you want used, subtle problems could occur due to C extension modules for Python being used which were compiled against that installation.
In this case you would see:. For some Linux installations would need to be done in init scripts for Apache. MacPorts, there generally should not ever be any issues with whether it is a shared library or not as everything should just work. This seems to vary between what Python installation was used and what MacOS X operating system version.
In this case, if multiple installations of same version of Python in different locations, may find the system installation rather than your custom installation. This seems to docz the problems in most cases. As such, it uses a series of checks to try and determine where the Python installation is actually located.
Index of /dist/httpd/docs
This check has htypd subtleties and how it works varies depending on the platform used. It can also be worthwhile to check that the Python module search path also looks correct. If the calculated directory is wrong, then you will need to use the WSGIPythonHome directory to set the location to the correct value.
WSGI applications can run in either embedded mode or daemon mode. In the case of embedded mode, the WSGI application runs within the Apache child processes themselves. If the configuration is such that the WSGI application is running in embedded mode, then you will see:. Do note though that these are also actually the defaults for these if not explicitly defined.
If the WSGI application is actually running in daemon mode, then a non empty string will instead be shown corresponding to the name of the daemon process group used. As well as WSGI application being able to be delegated to run in either embedded mode or daemon mode, within the process it ends up running in, it can be delegated to a specific Python sub interpreter.
If being run in the main interpreter, ie. This will be a value made up from the name of the virtual host or server, the port on which connection was accepted and the mount point of the WSGI application. The port however is actually dropped where port is 80 or One such difference is whether a specific Apache child process uses multiple threads for handling requests or whether a single thread is instead used.
Depending on how you configure a daemon process group when using daemon mode will also dictate whether single or multithreaded. By default, if number of threads is not explicitly specified for a daemon process group, it will be multithreaded. Whether a WSGI application is executing within a multithreaded environment is important to know. If thtpd is, then you need to ensure that your own code and any framework you are using is also thread safe.
Feb 10 The list of mechanisms which might be used to implement the cross process mutex are as follows: Accept htt;d lock mechanism ‘xxx’ is invalid.
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