This example is for Ubuntu. Run sudo apachectl -S to check which conf file you are using. The result is something like: Then update the file /etc/apache2/sites-enabled/000-default.conf. Change the default file in that file. You need to change another file /etc/apache2/ports.conf. to update it to the right port. Restart apache sudo service apache2 restart Then check the status: sudo apachectl -S Done.