Building a Container Image from Scratch: A Deep Dive into OCI
2025-03-20
This article provides a clear and concise explanation of container image internals. By building a simple "hello world" image from scratch, the author details the four core components of an OCI image: layers, config, manifest, and index. The article explains how layers are created, how they combine to form a complete filesystem, and how content-addressability ensures data integrity and efficiency. The process of building with both a scratch and an alpine base image is compared, culminating in the successful running of the built container image.