Скачать или смотреть How to Execute a PowerShell Script and Launch .exe in Dockerfile Entrypoint

Learn how to correctly execute a `PowerShell` script and run an executable in your Dockerfile entrypoint for Windows containers.
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This video is based on the question https://stackoverflow.com/q/67686268/ asked by the user 'Denis Steinman' ( https://stackoverflow.com/u/3253896/ ) and on the answer https://stackoverflow.com/a/67687515/ provided by the user 'Karolina Ochlik' ( https://stackoverflow.com/u/5720797/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Execute a PowerShell Script and Launch .exe in Dockerfile Entrypoint

When working with Docker for Windows, you might encounter situations where you need to execute a PowerShell script before starting an application like nginx.exe. If you're new to PowerShell and Docker, doing this correctly can be challenging. In this guide, we will explore how to properly set up your Dockerfile to achieve this goal.

The Problem: Running PowerShell and nginx.exe in a Docker Container

In your scenario, you want to accomplish two main tasks:

Execute a PowerShell script (C:\nginx\Configure-Nginx.ps1) before the main application starts.

Launch nginx.exe within your Windows container.

You initially set your Dockerfile's entrypoint like this:

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

While this seems logical at first glance, it doesn't work as intended. Let's break down how to resolve it.

The Solution: Properly Configuring the Dockerfile

To ensure that your PowerShell script executes before starting the nginx.exe, you need to separate these commands into two steps. Here’s how you can do it:

Step 1: Using CMD to Run the PowerShell Script

Instead of combining the PowerShell command with the entrypoint command, you should use the CMD directive to run the script. Here’s the proper configuration:

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

This line tells Docker to execute the Configure-Nginx.ps1 script using PowerShell in the command prompt.

Step 2: Setting the ENTRYPOINT for nginx.exe

The ENTRYPOINT directive should strictly command Docker to launch the nginx.exe after executing the previous command. Set it up like this:

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

This way, Docker knows that the base command you want to run within the container is nginx.exe, which will run in the context of PowerShell.

Complete Example Dockerfile

Combining both steps, here’s how the complete Dockerfile should look:

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

Conclusion

Running scripts and applications within a Docker container for Windows can be tricky when you're starting out. By separating your script execution from your main application launch, you can ensure both run smoothly. Remember to always run your PowerShell commands with -c parameter for command execution and to appropriately configure your Dockerfile.

With this structured approach, you should be able to effectively execute your PowerShell script and launch nginx.exe in your Docker container. Happy coding!