How to start and stop Apache 2 in Ubuntu Linux
How to start Apache 2:
sudo service apache2 start
How to stop Apache 2:
sudo service apache2 stop
How to restart Apache 2:
sudo service apache2 restart
How to reload Apache 2:
sudo service apache2 reload
Reloading is useful if you change a virtualhost file, since it will not actually stop Apache. Therefore, your websites will not go offline (even for a few seconds).