systemd — manage Linux services

## Service control
`sudo systemctl start name` — start
`sudo systemctl stop name` — stop
`sudo systemctl restart name` — stop + start
`sudo systemctl reload name` — reload config without restart (if supported)

## Boot behavior
`sudo systemctl enable name` — start on boot
`sudo systemctl disable name` — don't start on boot
`sudo systemctl is-enabled name` — check boot state

## Status + diagnostics
`systemctl status name` — current state + recent log
`systemctl list-units --type=service` — all services
`systemctl list-units --type=service --failed` — failed only
`systemctl cat name` — show the unit file

## Logs
`journalctl -u name` — all logs for this unit
`journalctl -u name -f` — follow (tail -f equivalent)
`journalctl -u name --since "10 min ago"` — recent slice

## Reload + edit
`sudo systemctl daemon-reload` — reload after editing a unit file
`sudo systemctl edit name` — edit override file (recommended over editing /lib/systemd/system/)