Resolving Permission Denied Error While Running Docker Containers in AWS CodeBuild

Learn how to troubleshoot and fix permission issues when running Docker containers in AWS CodeBuild, particularly with Flyway migrations.
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This video is based on the question https://stackoverflow.com/q/64716075/ asked by the user 'Grant Fritchey' ( https://stackoverflow.com/u/793896/ ) and on the answer https://stackoverflow.com/a/71698721/ provided by the user 'David Atkinson' ( https://stackoverflow.com/u/167364/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Navigating the Permission Denied Issue in AWS CodeBuild with Docker

If you've stumbled upon the dreaded permission error while trying to run your Docker containers in AWS CodeBuild, you're not alone. Many developers encounter the Permission denied message, particularly when dealing with file outputs from applications like Flyway. This guide dives into the root cause of this issue and provides you with a step-by-step solution to resolve it.

Understanding the Problem

When executing the command below in AWS CodeBuild:

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

You may encounter an error resembling:

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

This error indicates that the Docker container running within AWS CodeBuild does not have the appropriate permissions to write to the specified file path. Although the same command might execute smoothly on your local machine (perhaps after adjusting file paths), the environment differences in AWS CodeBuild can lead to permissions issues.

Fixing the Permission Error

Step 1: Analyzing Permissions

The core of the problem lies in the container's lack of write access to the host directory mapped via -v flag. By default, when CodeBuild runs your container, it may restrict certain permissions to prevent unauthorized access to the host file system.

Step 2: Save Artifacts within the Container

One effective workaround is to adjust the way you're capturing outputs from the Docker container. Instead of directly writing the output to the host file system, let’s save it inside the container first:

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

Step 3: Breaking Down the Commands

Create the Container:

The docker create command builds the container and specifies where to put your migrations.

Ensure that you set the host path correctly in <flywaymigrationspathonhost>, so changes can be tracked after your migration task ends.

Start the Container:

docker start -a ${container} starts the container and attaches the output stream to your terminal. This will let you observe any logs or errors during migration.

Copy Files from the Container:

The docker cp ${container}:/flyway/reports/changes.sql <hostpath> command lets you copy the necessary file from the container back to the host path you want.

Conclusion

By following these straightforward steps, you can avoid the Permission denied issue and successfully manage your Flyway migrations within AWS CodeBuild. Completing these adjustments not only resolves the immediate problem but also increases your understanding of how Docker and AWS interact in a build environment.

Happy coding and may your Docker containers run smoothly in the cloud!

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