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DevOps and Docker Talk: Cloud Native Interviews and Tooling
Dockerfiles have versions?
Dec 29, 2023
In this podcast, Beth Fisher, the producer, and Bret Fisher, the host, discuss the evolution of Dockerfiles and the importance of versioning. They explain the benefits of using the latest Dockerfile parser and Docker front ends, highlight the challenges of Docker engine versions, and explore new features in Docker file front ends. They also talk about the significance of the syntax line, Dockerfile versions, and efficient image updates with the 'ad' command.
16:06
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Quick takeaways
- Including 'syntax = Docker/dockerfile:1' at the top of your Dockerfile ensures access to the latest features of Dockerfile front end version and Build Kit.
- The latest Dockerfile front end version provides features like 'run --mount' option, 'here docs', 'copy --link', 'add --link', and simplified downloading and unpacking of files with 'add' command.
Deep dives
The Evolution of Dockerfile and Build Kit
The podcast discusses the evolution of Dockerfile and the introduction of Build Kit. Since 2018, Docker has shipped Docker engine with Build Kit, which is a separate utility with its own repository. Many tools, even those that are not officially Build Kit-based, use Build Kit in the background. Dockerfile has been regularly updated with new features and expanded existing ones. To ensure access to the latest features, it is recommended to include the line 'syntax = Docker/dockerfile:1' at the top of your Dockerfile. This will prompt Build Kit to use the latest front end version and parse your Dockerfile accordingly.
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