Docker and Dockerfiles provide repeatable processes across the application development cycle, providing a distinctive facility for both developers and DevOps engineers-production-ready deployments, infused with the confidence of tested images and the ease of automation. This provides a high level of empowerment to those needing it most, and results in the continuous delivery of tested and production-ready image building that we can fully automate, extended as far out as, and across, our clouds.

In this chapter, we learned that a mission-critical task in a production-ready application containerization is image building. The building of base and layered images and avoiding areas for troubleshooting are the primary topics we covered. In building our base images, we saw that the Docker Registry provides ample and validated images that we can freely use for repeatable processes. We also canvassed building images manually, from scratch. Moving forward, we explored building layered images...