systemd Basics

Start service
sudo systemctl start nginx

Stop service
sudo systemctl stop nginx

Restart service
sudo systemctl restart nginx

Reload configuration
sudo systemctl reload nginx

Service status
systemctl status nginx

Enable on boot
sudo systemctl enable nginx

Disable on boot
sudo systemctl disable nginx

Check if enabled
systemctl is-enabled nginx

Check if active
systemctl is-active nginx

List all services
systemctl list-units --type=service

List running services
systemctl list-units --type=service --state=running

List failed services
systemctl list-units --state=failed

View service logs
journalctl -u nginx

Follow logs
journalctl -u nginx -f

Show last N lines
journalctl -u nginx -n 50

Since time
journalctl --since today