If a systemd service fails to start, begin with systemctl status name.service, then inspect its journal with journalctl -u name.service -b. The first command shows the unit state, process result and recent messages; the second gives you the service’s records from the current boot. Those messages—not the generic failure from systemctl start—usually point to the next diagnostic step.
1. Check the service status
Replace name.service with the actual unit name, such as nginx.service, and run:
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systemctl status name.serviceThe status output is the quickest place to see whether the unit is loaded, active or failed, where its unit file was loaded from, and the process outcome. It also includes recent log lines that may expose the immediate error. A failed systemctl start often returns only a generic message telling you to check the service status or system journal. systemd’s debugging guide notes that service stdout and stderr are normally directed to the systemd journal, so application output may not appear in the terminal where you ran systemctl start.
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2. Find the service’s journal messages
To see journal entries for that unit from the current boot, run:
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journalctl -u name.service -bThe -u option filters by unit, while -b selects the current boot. These options are documented in the journalctl manual for systemd 255. If the failure occurred during the previous boot, use -b -1 instead. You can also inspect the relevant boot’s logs without -u if you need context from other system components around the same time.
System and user services use different journal modes. For a user service, select the user journal with --user and filter for its unit; for a system service, use the system journal, which is the default. Journal access may be restricted by permissions, and whether older boots are available depends on the host’s journal persistence configuration.
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3. Interpret the message before changing anything
Separate errors from systemd—the manager—from errors emitted by the application. A process exit status records how the process ended; by itself, it does not identify the repair. Look for the accompanying message and connect it to the unit or application configuration.
- Command or executable problem: Check whether the command named by
ExecStartexists and is executable by the service. - Application configuration problem: Read the application’s own error and verify the referenced configuration file and its syntax. The systemd debugging guide illustrates a service process exiting with an
ExecStartstatus alongside the application message “Failed to parse config.” - Dependency or permission problem: Look for messages identifying a missing dependency, denied access, or an unreadable file, then check the relevant unit settings, ownership and permissions.
- Unit directive problem: If systemd cannot load or interpret the unit, focus on the manager’s unit-loading message and the directive it identifies rather than the application’s runtime behavior.
These are possibilities, not diagnoses: follow the actual status and journal messages. Avoid changing several settings at once, since that can obscure which change resolved the failure.
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4. Reload systemd after editing a unit file
If you changed the service’s unit file, tell systemd to refresh its view before retrying:
sudo systemctl daemon-reloadThen start the service again and inspect the new status and journal entries:
sudo systemctl start name.service
systemctl status name.service
journalctl -u name.service -bdaemon-reload is for changes to unit files; it does not fix an application error or validate the application’s own configuration. If you changed only an application configuration file, follow that application’s requirements for applying the change.
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A single service failure does not normally call for booting into a recovery target. If the wider system is impaired and ordinary boot or login is not usable, systemd’s debugging documentation describes rescue.target and emergency.target as recovery paths. Emergency mode may leave the root filesystem mounted read-only; editing files there can require remounting / read-write. Use these modes for machine-level recovery, not as a routine service troubleshooting step.
6. Share useful evidence if the failure persists
If you need help from an administrator or distribution community, provide the exact service status and the relevant journal entries, along with the Linux distribution and systemd version. Include enough surrounding log context to show what happened before the failure, and review logs for passwords, tokens, personal data or other sensitive values before posting them publicly. For a suspected systemd or distribution bug, the systemd project recommends reporting distribution issues to the distribution’s tracker first and supplying complete logs and system context rather than isolated snippets.
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