How are docker images built? A look into the Linux overlay file-systems and the OCI specification

This blog post provides a detailed explanation of how Docker images are built, focusing on the Linux overlay file systems and the OCI (Open Container Initiative) specification. The author starts by explaining the concept of containerization and the benefits it provides. They then dive into the technical details of overlay file systems, which allow Docker to efficiently store and manage multiple layers of a container image. The post also covers the OCI specification, which standardizes container formats and runtime environments. Overall, this article provides insights into the inner workings of Docker image construction and the underlying technologies that make it possible.