Start/Stop/Set On-Boot a service

For CentOS/RedHat:

sudo systemctl enable servicename
sudo systemctl start servicename

For Ubuntu

enable or disable: systemctl enable/disable apache2

sudo systemctl [action] [service name]

To start a service:

sudo systemctl stop ufw

To stop a service:

sudo systemctl start ufw

To restart a service:

sudo systemctl restart ufw