How to View Logs in Azure App Service Easily

To view logs in Azure App Service, use the Log Stream feature in the Azure Portal for real-time logs or enable Application Logging to save logs to storage. You can also use Azure CLI commands like az webapp log tail to stream logs directly to your terminal.

Syntax

Here are common ways to view logs in Azure App Service:

• Azure Portal Log Stream: Navigate to your App Service > Log stream to see live logs.
• Enable Application Logging: Turn on logging in App Service logs settings to save logs to file system or blob storage.
• Azure CLI Command: Use az webapp log tail --name <app_name> --resource-group <resource_group> to stream logs in terminal.

bash

az webapp log tail --name <app_name> --resource-group <resource_group>

Example

This example shows how to stream logs from an Azure App Service using Azure CLI.

bash

az webapp log tail --name myappservice --resource-group myresourcegroup

Output

2024-06-01T12:00:00.000Z INFO  Starting log stream...
2024-06-01T12:00:01.000Z INFO  HTTP GET /api/values responded 200
2024-06-01T12:00:05.000Z ERROR Exception occurred in processing request

Common Pitfalls

• Not enabling logging in App Service settings before trying to view logs.
• Using az webapp log tail without specifying the correct app name or resource group.
• Expecting logs immediately after enabling logging; sometimes it takes a few minutes to start capturing logs.
• Confusing Log stream with saved logs; stream shows live logs but does not save them.

bash

Wrong:
az webapp log tail --name wrongapp --resource-group wronggroup

Right:
az webapp log tail --name myappservice --resource-group myresourcegroup

Quick Reference

Method	Description	How to Access
Log Stream	View live logs in real-time	Azure Portal > App Service > Log stream
Application Logging	Save logs to file system or blob storage	Azure Portal > App Service > App Service logs
Azure CLI	Stream logs in terminal	az webapp log tail --name --resource-group

Key Takeaways

Enable logging in App Service settings before viewing logs.

Use Azure Portal Log Stream for real-time log viewing.

Use Azure CLI command 'az webapp log tail' to stream logs in terminal.

Logs may take a few minutes to appear after enabling logging.

Ensure correct app name and resource group when using CLI commands.