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Check if virtual hosts are allowed

By default, Apache2 uses the /etc/apache2/vhosts.d/*.conf files (the location of the virtual hosts, one configuration file per virtual host in /etc/apache2/vhosts.d/), therefore per default we do not need to indicate that this file will be included during the runtime of Apache.
See: /etc/apache2/httpd.conf:
cat /etc/apache2/httpd.conf
See uncommented?
IncludeOptional /etc/apache2/vhosts.d/*.conf

Edit configuration file

1.7. What is where?

/etc/hosts
/etc/apache2/httpd.conf
/etc/apache2/conf.d/vhost.conf
/etc/apache2/vhosts.d/*.conf
/etc/apache2/default-server.conf	Global configuration for all virtual hosts with reasonable defaults. Instead of changing the values, overwrite them with a virtual host configuration.