How to add Linux service to autostartup

If you wish that your service would start during Linux boot, you have to execute following commands:

sudo update-rc.d <service-name> defaults

This should add the service to the automatic startup system. But if you get:

System start/stop links for /etc/init.d/<service-name> already exist.

Execute the command:

sudo update-rc.d <service-name> enable