Скачать или смотреть Fixing kubectl logs to Restore Your Logs While Remote Debugging with dlv

Discover how to get your logs back when using `kubectl logs` and remote debugging with dlv in your Go application. Learn the importance of the `--continue` flag and how it works.
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This video is based on the question https://stackoverflow.com/q/74257073/ asked by the user 'Rajeshwar' ( https://stackoverflow.com/u/1305891/ ) and on the answer https://stackoverflow.com/a/74343678/ provided by the user 'chresse' ( https://stackoverflow.com/u/1560953/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the Problem of Missing Logs in Kubernetes while Debugging with dlv

If you are working with a Go application deployed on Kubernetes, you may have encountered a frustrating issue where your logs become inaccessible when enabling remote debugging with dlv. Instead of the usual output from your logs, you may only see messages like API server listening at: [::]:40000. In this guide, we will explore why this happens and how to restore your ability to access logs while using dlv for remote debugging.

Understanding the Situation

When running a Go application, you typically expect to retrieve logs easily using the command:

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The logs usually provide critical information or tell you what is happening in your application. However, introducing dlv for remote debugging can significantly change your logging experience.

What is dlv?
dlv (Delve) is a debugger for the Go programming language. It allows developers to debug their applications by providing tools to pause, inspect, and modify application execution.

The Issue with Logs
When you start dlv without specific configurations, it halts your application and waits for a remote connection. As a result, you may miss essential log outputs that would otherwise appear.

Solution: Using the --continue Flag

The primary solution to recover your logs while using dlv involves adding the --continue flag to your debugging command. This flag allows the application to start executing immediately rather than waiting for a remote connection.

Step-by-Step Instructions

Setup Your dlv Command
Start Delve with the --listen option and the --continue flag. Here’s how to do it:

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In this command:

--listen=:2345: This tells dlv to listen for incoming connections on port 2345.

--headless: This runs Delve in headless mode, suitable for remote debugging.

exec your/app: This executes your application with debugging enabled.

--continue: This ensures that your application runs immediately, allowing it to log output as expected.

Understanding the Execution Flow
With the --continue flag, your application starts running immediately, producing the usual log output. Without this flag, Delve would pause execution, leading to the limited logs you observed.

Additional Considerations

Make sure that your Docker container and Kubernetes pod are appropriately configured to expose the necessary ports (like 40000 for your app and 2345 for the debugger).

Familiarize yourself with more options for Delve by checking the help command:

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This command provides further details on available flags and configuration options.

Conclusion

When remote debugging your Go applications using dlv, missing logs can be a significant hurdle. However, by utilizing the --continue flag, you can easily restore your logs and facilitate a smoother development experience. Remember to be cautious when exposing debugging ports and ensure your setup meets security standards to prevent unauthorized access.



By following the steps outlined above, you can effectively maintain logging capabilities while also leveraging powerful debugging tools. Happy coding and debugging!