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Installing a module package alone is not enough for a module to be usable in 
Apache, though. Modules must be enabled in order for Apache to be able to utilize 
them. As mentioned earlier, we can use the 
a2enmod
 and 
a2dismod
 commands for 
enabling or disabling a module. You can view a list of modules that are built-in to 
Apache with the following command:
apache2 -l 
The modules shown in the output will be those that are built into Apache, so you 
won't need to enable them. If the module your website requires is listed in the 
output, you're all set.
To view a list of all modules that are installed and ready to be enabled, you can run 
the 
a2enmod
 command by itself with no options:
Figure 14.2: The a2enmod command showing a list of available Apache modules
The end of the output of the 
a2enmod
 command will ask you whether or not you'd 
like to enable any of the modules:
Which module(s) do you want to enable (wildcards ok)? 
If you wanted to, you could type the names of any additional modules you'd like 
to enable and then press 
Enter
. Alternatively, you can press 
Enter
 without typing 
anything to simply return to the prompt.
If you give the 
a2enmod
 command a module name as an option, it will enable it for 
you. To enable PHP 7 (which we'll need later), you can run the following command:
sudo a2enmod php7.4

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