bash
sudo systemctl start nginxNotes
Starts the service right away but does not enable it on boot.
Linux systemd Services Cheat Sheet
Core systemctl commands, unit inspection, service lifecycle management, dependencies, and operational workflows.
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Service Lifecycle
Start, stop, restart, reload, and inspect services.
bash
sudo systemctl stop nginxNotes
Stops the active unit.
bash
sudo systemctl restart nginxNotes
Useful after config or code changes.
bash
sudo systemctl reload nginxNotes
Only works for services that implement reload.
bash
sudo systemctl reload-or-restart nginxNotes
Safe operational convenience command.
bash
systemctl status nginxNotes
Displays high-level service health and recent logs.
bash
systemctl is-active nginxNotes
Useful in scripts and health checks.
bash
systemctl is-failed nginxNotes
Good for automation and troubleshooting.
Enable, Disable, Mask
Control startup behavior and boot-time activation.
bash
sudo systemctl enable nginxNotes
Creates the appropriate symlinks so the service starts at boot.
bash
sudo systemctl disable nginxNotes
Prevents the service from starting automatically.
bash
sudo systemctl enable --now nginxNotes
Common operational shortcut.
bash
sudo systemctl disable --now nginxNotes
Useful during maintenance or decommissioning.
bash
sudo systemctl mask nginxNotes
Strongest disable. Even manual starts are blocked.
bash
sudo systemctl unmask nginxNotes
Required before the service can start again.
bash
systemctl is-enabled nginxNotes
Returns enabled, disabled, masked, or other states.
List and Inspect Units
Discover loaded units, failed units, and service metadata.
bash
systemctl list-unitsNotes
General entry point for discovering what's running.
bash
systemctl list-units --type=serviceNotes
Useful for service inventory and troubleshooting.
List all service unit files
Show loaded and unloaded service files.
bashANYsystemctlunit-filesservice
bash
systemctl list-unit-files --type=serviceNotes
Displays enablement states for installed service definitions.
bash
systemctl --failedNotes
One of the fastest ways to spot broken units.
bash
systemctl show nginxNotes
Machine-friendly property view for scripts or deep inspection.
bash
systemctl show nginx -p ActiveState -p SubStateNotes
Helpful in shell scripts and monitoring checks.
Print unit file and drop-ins
Show the unit definition actually used by systemd.
bashANYsystemctlcatdrop-ins
bash
systemctl cat nginxNotes
Shows vendor unit plus override snippets.
bash
systemctl status sshdNotes
The status output often includes docs references and last log messages.
Dependencies and Targets
Understand ordering, wants, requires, and targets.
bash
systemctl list-dependencies nginxNotes
Useful to understand related services and startup order.
bash
systemctl list-dependencies --reverse network-online.targetNotes
Good for impact analysis.
bash
systemctl get-defaultNotes
Often graphical.target or multi-user.target.
bash
sudo systemctl set-default multi-user.targetNotes
Persists the default startup target.
bash
sudo systemctl isolate rescue.targetNotes
Can stop unrelated units to reach the target state.
Daemon Operations
Reload manager state and reset failures.
Reload systemd manager config
Reload unit files after changes.
bashANYsystemctldaemon-reloadunit-files
bash
sudo systemctl daemon-reloadNotes
Run this after editing or creating unit files.
bash
sudo systemctl daemon-reexecNotes
Advanced maintenance action; not needed for normal unit edits.
bash
sudo systemctl reset-failedNotes
Useful after fixing a broken service.
bash
sudo systemctl daemon-reload && sudo systemctl restart myappNotes
Typical operator sequence after editing a custom unit.
Shutdown and Reboot
Reboot, halt, poweroff, rescue, and emergency mode.
bash
sudo systemctl rebootNotes
Preferred systemd-based reboot command.
bash
sudo systemctl poweroffNotes
Stops services cleanly before poweroff.
bash
sudo systemctl haltNotes
Less common than poweroff or reboot.
bash
sudo systemctl rescueNotes
Useful for maintenance with minimal services.
bash
sudo systemctl emergencyNotes
Most minimal recovery environment.
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