Troubleshooting and Debugging - distribution/distribution

Troubleshooting and Debugging for the Distribution project (https://github.com/distribution/distribution/) involves identifying and resolving common issues using various tools and techniques. This document will cover possible options and provide examples for each option, quoting the source of information to build confidence.

Key Technologies and Dependencies:

• Go Programming Language
• HTTP
• Docker
• containerd
• Google Cloud Storage
• Azure SDK for Go
• Logrus Logstash hook
• Go bindings for systemd
• Go event handling library and Go metrics library

Troubleshooting Process:

1. Gather Information:

• Collect system information, configuration, and diagnostic data using tools like sosreport (https://developers.redhat.com/blog/2018/11/12/improved-support-information-for-rhel-on-azure-sosreport-plugin-updated/).
• Observe the problem and gather as much information as possible.
• Use on-line resources to search for similar bugs.

2. Analyze the Problem:

• Identify the problem by asking questions about what you see and what you do not see (https://opensource.com/business/15/10/troubleshooting-process-linux-problems/).
• Determine if the problem is caused by hardware, Linux, application software, or lack of user knowledge or training.
• Look for error messages and log entries pertaining to the problem.

3. Debugging:

• Use dynamic instrumentation tools, such as SystemTap, to trace and instrument the software (https://developers.redhat.com/blog/2018/05/11/use-the-dynamic-tracing-tools-luke/).
• Debug distroless images using different strategies (https://edu.chainguard.dev/chainguard/chainguard-images/debugging-distroless-images).

4. Fixing the Problem:

• Use the source code to understand how the code works and find a solution.
• Implement the fix and test it thoroughly.

5. Verification:

• Verify that the problem has been resolved and that no new issues have been introduced.

Tools and Techniques:

• SystemTap: A dynamic tracing tool that traces and instruments the software (https://developers.redhat.com/blog/2018/05/11/use-the-dynamic-tracing-tools-luke/).
• sosreport: A tool that collects accurate current details of system information, configuration, and diagnostic information (https://developers.redhat.com/blog/2018/11/12/improved-support-information-for-rhel-on-azure-sosreport-plugin-updated/).
• Debugging distroless images (https://edu.chainguard.dev/chainguard/chainguard-images/debugging-distroless-images).

Additional Resources:

• Troubleshooting a Picture is Worth 1,000 Traces (https://www.youtube.com/watch?v=rMSqgSFuBi0).
• AWS re:Invent 2022 - Building observable applications with OpenTelemetry (https://www.youtube.com/watch?v=efk8XFJrW2c).
• AWS re:Invent 2022 - What’s new in Amazon OpenSearch Service (https://www.youtube.com/watch?v=yFmkE7tIslA).

By following this troubleshooting and debugging process, you can identify and resolve common issues in the Distribution project. Remember to always gather as much information as possible, analyze the problem, debug, fix, and verify the solution. Use the tools and techniques mentioned above and consult the additional resources for further guidance.