Exam essentials

Container runtimes

Container runtimes are a class of infrastructure application that specialises in low-level container operations such as creating, starting, stopping, and deleting containers. They tend to operate in the background and are managed by higher-level tools like Kubernetes. For example, you or your team might deploy applications to Kubernetes on a daily basis. However, you won’t run the commands to actually start and stop containers – Kubernetes looks after all of that for you behind the scenes. Docker is the best-known container runtime, but others include containerd and CRI-O.

Containerisation

Containerisation is the process of building an application and its dependencies into a container image. For example, when a developer has written an application and packaged it as a container image you can say the developer has “containerised the app”.

The Open Containers Initiative (OCI)

The OCI is an open organisation...