systemctl cheat sheet (Ubuntu)
systemd unit (service) control.
Status & list
systemctl status nginx.service
systemctl list-units --type=service --state=running
systemctl --failed
Start / stop / restart
sudo systemctl start nginx.service
sudo systemctl stop nginx.service
sudo systemctl restart nginx.service
sudo systemctl reload nginx.service
Enable / disable
sudo systemctl enable nginx.service
sudo systemctl disable nginx.service
sudo systemctl daemon-reload