Скачать или смотреть Fixing the Varnish Container Restart Loop in Docker on Windows

Learn how to resolve the `Varnish` restart loop error in `Docker` on `Windows` caused by incorrect line endings in your script file.
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This video is based on the question https://stackoverflow.com/q/64670731/ asked by the user 'Álvaro Meireles' ( https://stackoverflow.com/u/11876762/ ) and on the answer https://stackoverflow.com/a/64670798/ provided by the user 'SiHa' ( https://stackoverflow.com/u/3714940/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting Varnish on Docker with Windows: Fixing Restart Loop Issues

Docker is widely recognized for simplifying application deployment by containerizing services, but issues can arise, especially when working on Windows. One common issue developers face when running a Varnish container is the frustrating restart loop. If you're encountering a similar problem, read on to discover how to diagnose and resolve this issue quickly.

The Problem: Restart Loop in Varnish Container

Imagine you are setting up Varnish within a Docker environment on your Windows machine. Everything seems straightforward until you execute your Docker compose command, only to find your Varnish container is caught in a restart loop. In your logs, you see an error message such as:

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

This cryptic message may lead to confusion, but don’t worry; it’s a fixable issue. The key to resolving the issue lies in understanding its origin.

Understanding the Error

The error you're encountering, particularly the ^M character, is indicative of a problem with line endings in your script file. Here's a breakdown of why this happens:

Line Endings: Windows uses a carriage return combined with a line feed (CRLF) to denote the end of a line, while Linux only uses a line feed (LF). If your start.sh file was edited in a Windows environment, it's likely that it contains CRLF line endings, which Linux-based Docker containers cannot interpret correctly.

Interpreting the Script: When the container tries to execute the start.sh script, it looks for /bin/bash. However, due to the ^M character, it becomes /bin/bash^M, which leads to the bad interpreter error.

The Solution: Fixing the Line Endings

Step 1: Edit the Script with a Proper Text Editor

To address the incorrect line endings, follow these steps:

Use a Code Editor: Switch to a code editor that allows you to control line endings, such as:

Notepad+ + : Open your start.sh file, go to Edit EOL Conversion Unix (LF) to convert line endings.

Visual Studio Code (VSCode): Open the file, look for the line-ending setting at the bottom-right corner, and change it to LF. Save the file.

Step 2: Use Command Line Tools

If you have access to a Linux terminal, you can also use the dos2unix command to fix the script easily:

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

Step 3: Verify Git Configuration (if applicable)

If you are using Git on Windows, you might want to check your configuration to prevent the line ending issue from cropping up again in the future. You can set the following Git configuration:

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

This setting tells Git not to convert line endings automatically, which should help maintain consistency moving forward.

Conclusion

By following these steps to correct the line endings in your start.sh script, you should be able to eliminate the error and get your Varnish container up and running smoothly. Remember, the ^M character is a common pitfall when transitioning between Windows and Linux environments, but with a bit of diligence, you can avoid it. Happy coding!