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diff --git a/health/guides/systemdunits/systemd_device_unit_failed_state.md b/health/guides/systemdunits/systemd_device_unit_failed_state.md new file mode 100644 index 000000000..8a7fc39d9 --- /dev/null +++ b/health/guides/systemdunits/systemd_device_unit_failed_state.md @@ -0,0 +1,65 @@ +### Understand the alert + +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. + +### What is a systemd device unit? + +`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. + +### What does a failed state mean? + +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. + +### Troubleshoot the alert + +1. 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. + +2. 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. + +3. Fix the issue: + + Depending on the results from the previous steps, you might need to: + + - Check the hardware connections and make sure they are properly connected. + - Update or reinstall the device driver. + - Check and correct device configurations if needed. + +4. 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. + +5. 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. + +### Useful resources + +1. [Systemd Device Units](https://www.freedesktop.org/software/systemd/man/systemd.device.html) |