Build a Container Image from Scratch

There’s also a talk based on this article if you prefer video based content. You can find it here. For a developer, a Container image is essentially a collection of configurations required to run a container. But what really is a container image? You might know what a container image is, how it is made up of layers and that it’s a collection of tar archives. There are questions that still went unanswered, questions such as what makes up a layer, how are layers combined to form a complete filesystem or multi-platform images, etc. In this article, we’ll build a container image from scratch and try to answer all these questions to understand container image internals. OCI Image Little bit of history before we proceed. Up until roughly 10 years back, docker-format was the only format being used and with the emergence of all the tooling around containers, there was a need for standardisation. Around 2015, the Open Containers Initiative was established–no a Linux Foundation project–with t ... Read full article.