Differentiating Docker ADD and COPY Instructions

Explore the disparities between ADD and COPY commands in Dockerfiles and learn when to utilize each for enhanced security, functionality, and build context understanding.

Published 4 months ago by @Docker on www.docker.com

Abstract

The article delves into the distinctions between the ADD and COPY instructions in Dockerfiles. It emphasizes using COPY over ADD for security and simplicity. COPY copies files from the host to the Docker image, while ADD offers extended functionality like downloading URLs and extracting archives, with the caveat of potential security risks. When to use each command is detailed based on scenarios. Additionally, the article covers using remote contexts, such as Git repositories or remote URLs, in Docker builds and how ADD and COPY behave in those contexts.

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Discussion

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Relevance

Understanding the differences between ADD and COPY in Dockerfiles is crucial for optimizing security and functionality in your Docker images. Knowing when to use each instruction can enhance the efficiency and safety of your Docker build process.

Applicability

To apply this knowledge, ensure you predominantly use COPY for basic file copying to maintain security and simplicity. Only resort to ADD when specific advanced functionalities are needed, understanding the potential security risks involved. Evaluate your use case to determine the appropriate instruction to employ.

Risks

The main risk lies in using the ADD command, which introduces potential security vulnerabilities when downloading files from external URLs or automatically extracting archives. Misunderstanding how ADD operates may lead to unintended consequences and compromise the security of your Docker images.

Conclusion

In the future, Docker practices are likely to evolve with a focus on enhancing security measures while still providing flexibility in file handling. Keeping abreast of updates in Docker best practices and security protocols will be essential to ensuring the safety and efficiency of your Docker images in upcoming projects.

References

Further Informations and Sources related to this analysis. See also my Ethical Aggregation policy.

Docker Best Practices: Understanding the Differences Between ADD and COPY Instructions in Dockerfiles | Docker
What are Docker ADD/COPY instructions and when should you use them? We explain the differences between the ADD and COPY instructions in Dockerfiles, including when to use each based on security, functionality, and build context.

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