Скачать или смотреть Resolving the Dockerfile "No Such File or Directory" Error for Your Go Application

Learn how to fix the common Dockerfile error where your Go application cannot find necessary files when running in a container. This guide breaks down the solution step-by-step.
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This video is based on the question https://stackoverflow.com/q/68101331/ asked by the user 'uPong26' ( https://stackoverflow.com/u/16298783/ ) and on the answer https://stackoverflow.com/a/68106478/ provided by the user 'jmaitrehenry' ( https://stackoverflow.com/u/772027/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the Dockerfile "No Such File or Directory" Error for Your Go Application

When working with Docker, it can be frustrating to encounter errors, especially when you're trying to deploy your Go application into a production environment. One such common error is the "no such file or directory" error. In this guide, we’ll explore what causes this error and how you can effectively resolve it in your Dockerfile.

The Problem: Understanding the Error

You are trying to run your Dockerized Go application, and you encounter an error message that looks something like this:

[[See Video to Reveal this Text or Code Snippet]]

This error indicates that your application is attempting to access a file that doesn't exist in the container’s file system. Specifically, it is looking for views/public/index.html, which is supposed to be part of your app's structure.

Analyzing the Dockerfile

To understand where things went wrong, let’s take a closer look at your Dockerfile:

[[See Video to Reveal this Text or Code Snippet]]

Here’s a breakdown of the key sections:

Builder Stage: This phase compiles your Go application and sets up the necessary files. The working directory is set to where your code resides, and all files are copied over.

Final Stage: You switch to a scratch image to create a minimal container. However, it seems you're missing crucial directories that store static assets and views.

The Solution: Fixing the Dockerfile

To resolve the "no such file" error, you need to ensure that both the views and static directories are copied to the final image before you switch users. Here’s how to do that:

Step 1: Modify the COPY Commands

You need to add the following lines before your USER appuser line:

[[See Video to Reveal this Text or Code Snippet]]

Complete Dockerfile with Fixes

Here’s how your updated Dockerfile would look like:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By adding these lines to your Dockerfile, you ensure that all necessary files and directories are included in your container, resolving the "no such file or directory" error when your application attempts to serve HTML files in production.

Feel free to reach out if you have any further questions or run into other issues. Happy Dockerizing!