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App Service diagnostics and logging in Azure - Cheat Sheet & Quick Revision

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Recall & Review
beginner
What is Azure App Service diagnostics used for?
Azure App Service diagnostics helps identify and troubleshoot issues in your web apps by collecting logs, metrics, and error details.
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beginner
Name two types of logs you can enable in Azure App Service.
You can enable Application Logging (for app-generated logs) and Web Server Logging (for HTTP request logs).
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intermediate
How do you enable Application Logging in Azure App Service?
In the Azure portal, go to your App Service > Monitoring > App Service logs, then turn on Application Logging (Filesystem or Blob Storage).
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intermediate
What is the purpose of the 'Diagnose and solve problems' blade in Azure App Service?
It provides guided troubleshooting tools and insights to quickly find and fix common issues affecting your app's health and performance.
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intermediate
Where can you find the HTTP request logs after enabling Web Server Logging?
HTTP request logs are saved to the file system or Azure Blob Storage, depending on your configuration, and can be accessed via FTP or Azure Storage Explorer.
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Which Azure App Service log type captures detailed app errors and trace messages?
AWeb Server Logging
BApplication Logging
CDetailed Error Messages
DFailed Request Tracing
Where can you enable App Service diagnostics in the Azure portal?
AUnder Diagnose and solve problems
BUnder Monitoring > App Service logs
CUnder Settings > Configuration
DUnder Deployment Center
What is the default retention period for logs stored on the file system in Azure App Service?
A7 days
B30 days
C1 day
DUnlimited
Which tool can you use to download logs from Azure Blob Storage?
AAzure DevOps
BVisual Studio Code
CAzure Storage Explorer
DAzure CLI
What does enabling 'Failed Request Tracing' help you diagnose?
ADatabase connection issues
BApp startup failures
CDeployment errors
DSlow HTTP requests and errors
Explain how to enable and access Application Logging in Azure App Service.
Think about the portal path and storage options.
You got /5 concepts.
    Describe the purpose and benefits of the 'Diagnose and solve problems' feature in Azure App Service.
    It’s like a helper tool for app problems.
    You got /4 concepts.

      Practice

      (1/5)
      1. What is the main purpose of enabling diagnostics and logging in Azure App Service?
      easy
      A. To increase the app's performance automatically
      B. To monitor and troubleshoot the app's behavior and errors
      C. To deploy new versions of the app faster
      D. To secure the app from unauthorized access

      Solution

      1. Step 1: Understand diagnostics and logging purpose

        Diagnostics and logging help capture app events and errors for monitoring.

      2. Step 2: Identify the main goal

        The main goal is to see what happens inside the app to fix issues.

      3. Final Answer:

        To monitor and troubleshoot the app's behavior and errors -> Option B

      4. Quick Check:

        Diagnostics = Monitor & troubleshoot [OK]
      Hint: Think: Why watch app logs? To find and fix problems [OK]
      Common Mistakes:
      • Confusing logging with performance tuning
      • Thinking logging deploys app updates
      • Assuming logging secures the app
      2. Which Azure CLI command correctly enables application logging for an App Service named myapp with file system logging?
      easy
      A. az webapp log config --name myapp --resource-group mygroup --application-logging filesystem --level Information
      B. az webapp log enable --name myapp --resource-group mygroup --application-logging filesystem
      C. az appservice log config --app myapp --group mygroup --enable-logging filesystem
      D. az webapp logging config --app myapp --resource-group mygroup --log-type filesystem

      Solution

      1. Step 1: Identify correct Azure CLI syntax for logging

        The correct command uses az webapp log config with parameters for name, resource group, logging type, and level.

      2. Step 2: Match command to options

        az webapp log config --name myapp --resource-group mygroup --application-logging filesystem --level Information matches the correct syntax and parameters exactly.

      3. Final Answer:

        az webapp log config --name myapp --resource-group mygroup --application-logging filesystem --level Information -> Option A

      4. Quick Check:

        Correct CLI syntax = az webapp log config --name myapp --resource-group mygroup --application-logging filesystem --level Information [OK]
      Hint: Use 'az webapp log config' with --application-logging and --level [OK]
      Common Mistakes:
      • Using wrong command like 'az webapp log enable'
      • Mixing parameter names like --app instead of --name
      • Omitting the logging level parameter
      3. Given the command az webapp log tail --name myapp --resource-group mygroup, what will be the output?
      medium
      A. It streams the live application logs from the App Service named myapp
      B. It shows the last 10 deployment logs for myapp
      C. It enables logging for the app myapp
      D. It downloads the log files to local machine

      Solution

      1. Step 1: Understand the purpose of 'az webapp log tail'

        This command streams live logs from the running app in real time.

      2. Step 2: Compare options to command behavior

        It streams the live application logs from the App Service named myapp correctly describes live log streaming, others describe different actions.

      3. Final Answer:

        It streams the live application logs from the App Service named myapp -> Option A

      4. Quick Check:

        Log tail = live streaming logs [OK]
      Hint: Remember 'log tail' means live log streaming [OK]
      Common Mistakes:
      • Thinking it shows deployment logs only
      • Confusing enabling logs with streaming logs
      • Assuming it downloads logs instead of streaming
      4. You ran az webapp log config --name myapp --resource-group mygroup --application-logging filesystem --level Error but logs are not appearing. What is a likely cause?
      medium
      A. The app is not generating any error logs to capture
      B. The command syntax is incorrect and did not apply settings
      C. The resource group name is invalid
      D. You forgot to enable web server logging separately

      Solution

      1. Step 1: Check if web server logging is required

        Application logging and web server logging are separate; enabling one does not enable the other.

      2. Step 2: Identify missing step

        If web server logs are needed, they must be enabled explicitly; otherwise logs may not appear.

      3. Final Answer:

        You forgot to enable web server logging separately -> Option D

      4. Quick Check:

        Separate enable for web server logs needed [OK]
      Hint: Enable both app and web server logging to see all logs [OK]
      Common Mistakes:
      • Assuming application logging alone shows all logs
      • Ignoring separate logging types in Azure App Service
      • Blaming command syntax without checking logs generated
      5. You want to diagnose a performance issue in your Azure App Service. Which combination of logging and diagnostic features should you enable to get detailed error messages, HTTP request logs, and live monitoring?
      hard
      A. Enable only detailed error messages without any logging
      B. Enable only application logging to blob storage and disable web server logging
      C. Enable application logging (filesystem), web server logging, and use az webapp log tail for live streaming
      D. Use az webapp log download without enabling any logging

      Solution

      1. Step 1: Identify needed logs for performance diagnosis

        Detailed error messages, HTTP request logs, and live monitoring require application logging, web server logging, and live log streaming.

      2. Step 2: Match features to options

        Enable application logging (filesystem), web server logging, and use az webapp log tail for live streaming enables all needed logs and live streaming for real-time diagnosis.

      3. Final Answer:

        Enable application logging (filesystem), web server logging, and use az webapp log tail for live streaming -> Option C

      4. Quick Check:

        Combine logs + live tail for full diagnosis [OK]
      Hint: Combine app + web server logs with live tail for best insight [OK]
      Common Mistakes:
      • Relying on only one type of logging
      • Not using live log streaming for real-time issues
      • Downloading logs without enabling logging first
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