The Open Container Initiative image format
As we described in Chapter 1, Introduction to Container Technology, back in 2013, Docker was introduced in the container landscape and became very popular rapidly.
At a high level, the Docker team introduced the concept of container images and container registries, which was a game-changer. Another important step was being able to extract containerd projects from Docker and donate them to the Cloud Native Computing Foundation (CNCF). This motivated the open source community to start working seriously on container engines that could be injected into an orchestration layer, such as Kubernetes.
Similarly, in 2015, Docker, with the help of many other companies (Red Hat, AWS, Google, Microsoft, IBM, and others), started the Open Container Initiative (OCI) under the Linux Foundation umbrella.
These contributors developed the Runtime Specification (runtime-spec) and the Image Specification (image-spec) to describe how the API and the architecture...
