src/health/guides/systemdunits/systemd_device_unit_failed_state.md
This alert is triggered when a systemd device unit enters a failed state. If you receive this alert, it means that a device managed by systemd on your Linux system has encountered an issue and is currently in a non-operational state.
Systemd is a system and service manager for Linux operating systems. A device unit in systemd is a unit that encapsulates a device in the system's device tree (e.g., /sys directory). The device units are used to automatically discover and manage devices present on the system.
A failed state implies that the device has encountered an issue and is currently non-operational. The problem could be related to hardware, driver, or configuration issues.
Identify the failed device unit:
Check the systemd status for failed units using the following command:
systemctl --failed --type=device
This will show you the list of device units that are currently in a failed state.
Check logs for errors:
Use the journalctl command to check the logs for any error messages related to the failed device unit. For instance, if the failed unit is example.device, you can execute:
journalctl -xe -u example.device
This will show you the logs with any error messages that will help you identify the root cause of the failure.
Fix the issue:
Depending on the results from the previous steps, you might need to:
Restart the device unit:
Once the issue has been fixed, restart the device unit using systemctl:
sudo systemctl restart example.device
Replace example.device with the specific device unit name.
Validate the fix:
Check if the device unit is now operational by executing the following command:
systemctl status example.device
This should show you that the device unit is now active and running properly.