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Troubleshoot IoT Edge devices from the Azure portal

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Applies to: IoT Edge 1.5 checkmark IoT Edge 1.5 IoT Edge 1.4 checkmark IoT Edge 1.4

Important

IoT Edge 1.5 LTS and IoT Edge 1.4 LTS are supported releases. IoT Edge 1.4 LTS is end of life on November 12, 2024. If you are on an earlier release, see Update IoT Edge.

IoT Edge provides a streamlined way of monitoring and troubleshooting modules in the Azure portal. The troubleshooting page is a wrapper for the IoT Edge agent's direct methods so that you can easily retrieve logs from deployed modules and remotely restart them. This article shows you how to access and filter device and module logs in the Azure portal.

Access the troubleshooting page

You can access the troubleshooting page in the portal through either the IoT Edge device details page or the IoT Edge module details page.

  1. Sign in to the Azure portal and navigate to your IoT hub.

  2. In the left pane, select Devices under the Device management menu.

  3. Select the IoT Edge device that you want to monitor from the list of devices.

  4. On this device details page, you can either select Troubleshoot from the menu.

    Screenshot of the location of the Troubleshoot tab on the Azure portal, device details page.

    Or, select the runtime status of a particular module that you want to inspect.

    Screenshot of the location of the Runtime status column on the Azure portal, device details page.

  5. From the device details page, you can also select the name of a module to open the module details page. From there, you can select Troubleshoot from the menu.

    Screenshot of the location of the Troubleshoot tab on the Azure portal, module details page.

View module logs in the portal

On the Troubleshoot page of your device, you can view and download logs from any of the running modules on your IoT Edge device.

This page has a maximum limit of 1,500 log lines, and any logs longer are truncated. If the logs are too large, the attempt to get module logs fails. In that case, try to change the time range filter to retrieve less data or consider using direct methods to Retrieve logs from IoT Edge deployments to gather larger log files.

Use the dropdown menu to choose which module to inspect.

Screenshot showing how to choose a module from the dropdown menu that you want to inspect.

By default, this page displays the last 15 minutes of logs. Select the Time range filter to see different logs. Use the slider to select a time window within the last 60 minutes, or check Enter time instead to choose a specific datetime window.

Screenshot showing how to choose a time or time range from the time range popup filter.

Once you have the logs and set your time filter from the module you want to troubleshoot, you can use the Find filter to retrieve specific lines from the logs. You can filter for either warnings or errors, or provide a specific term or phrase to search for.

Screenshot showing how to use a dotnet regex pattern to search the logs, using the Find filter.

The Find feature supports plaintext searches or .NET regular expressions for more complex searches.

You can download the module logs as a text file. The downloaded log file reflects any active filters you applied to the logs.

Tip

The CPU utilization on a device spikes temporarily as it gathers logs in response to a request from the portal. This behavior is expected, and the utilization should stabilize after the task is complete.

Restart modules

The Troubleshoot page includes a feature to restart a module. Selecting this option sends a command to the IoT Edge agent to restart the selected module. Restarting a module won't affect your ability to retrieve logs from before the restart.

Screenshot that shows how to restart a module from the Troubleshoot page.

Next steps

Find more tips for Troubleshooting your IoT Edge device or learn about Common issues and resolutions.

If you have more questions, create a Support request for help.