1.10. Working with Apache modules


The httpd service is a modular application, and you can extend it with a number of Dynamic Shared Objects (DSOs). Dynamic Shared Objects are modules that you can dynamically load or unload at runtime as necessary. You can find these modules in the /usr/lib64/httpd/modules/ directory.

1.10.1. Loading a DSO module

As an administrator, you can choose the functionality to include in the server by configuring which modules the server should load. To load a particular DSO module, use the LoadModule directive. Note that modules provided by a separate package often have their own configuration file in the /etc/httpd/conf.modules.d/ directory.

Prerequisites

  • You have installed the httpd package.

Procedure

  1. Search for the module name in the configuration files in the /etc/httpd/conf.modules.d/ directory:

    # grep mod_ssl.so /etc/httpd/conf.modules.d/*
  2. Edit the configuration file in which the module name was found, and uncomment the LoadModule directive of the module:

    LoadModule ssl_module modules/mod_ssl.so
  3. If the module was not found, for example, because a RHEL package does not provide the module, create a configuration file, such as /etc/httpd/conf.modules.d/30-example.conf with the following directive:

    LoadModule ssl_module modules/<custom_module>.so
  4. Restart the httpd service:

    # systemctl restart httpd

1.10.2. Compiling a custom Apache module

You can create your own module and build it with the help of the httpd-devel package, which contains the include files, the header files, and the APache eXtenSion (apxs) utility required to compile a module.

Prerequisites

  • You have the httpd-devel package installed.

Procedure

  • Build a custom module with the following command:

    # apxs -i -a -c module_name.c

Verification

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