/etc/apache2/conf.d/ and /etc/apache2/sites-enabled are the two locations from where configuration settings are ready by apache
Apache configuration file has two lines (listed below) in /etc/apache2/apache2.conf which does that
# Include generic snippets of statements
Include /etc/apache2/conf.d/
# Include the virtual host configurations:
Include /etc/apache2/sites-enabled/
Tags: enable disable site, LINUX, port configuration, symbolic link, ubuntu
