basic service management with `systemd` (part 2)

Basic service management with `systemd` (part 2)

`Upstart` will be deprecated in favor of `Systemd`. With `Systemd` to manage the services we can do the following:

`systemctl enable SERVICE.service` - Turns the service on, on the next reboot or on the next start event. It persists after reboot.

`systemctl disable SERVICE.service` - Turns the service off on the next reboot or on the next stop event. It persists after reboot.

`systemctl is-enabled SERVICE.service` - Check if a service is currently configured to start or not on the next reboot.

`systemctl is-active SERVICE.service` - Check if a service is currently active.

`systemctl show SERVICE.service` - Show all the information about the service.