To reload the Apache 2 HTTPD configuration file without restarting the Apache service, you can use the following command:
sudo apache2ctl graceful
The graceful option signals the Apache process to reload the configuration file and apply the changes without interrupting ongoing requests. This allows you to make changes to the Apache configuration file and have those changes take effect without having to restart the entire Apache service.
Note: Some changes to the Apache configuration may require a full restart of the Apache service in order to take effect. In such cases, the graceful option will not work and you will need to restart the Apache service using the following command:
sudo service apache2 restart(Valium)