This tool is used for managing services (units).
Service/Daemon is an on-going process that provides a service, usually designed to interact with something outside of it. Ex. web server, monitoring tool, database...
Manages services.
systemctl <command> <service> - Format.
status - Shows the status and last lines of log.
start - Starts a service.
stop - Stops a service.
enable - Enable start on BOOT.
disable - Disable start on BOOT.
reload - Re-read the configuration files.
restart - Restart the service and re-read config files.
Manages logs.
journalctl -u SERVICE - Log from a service.
journalctl --since "10 min ago" - Log from last 10 minutes.