Building a Docker Container from Scratch: Unveiling the Secrets of Mount Namespaces
2025-09-17
This article provides a clear and concise explanation of how to build a simple Docker-like container using only stock Linux tools: unshare, mount, and pivot_root. It focuses on the crucial role of the mount namespace in container isolation, and the complementary roles of other namespaces (PID, cgroup, UTS, network). Through step-by-step practical exercises, readers will understand how mount namespaces isolate mount tables and how mount propagation affects interactions between namespaces. Ultimately, readers will be able to create fully featured, Docker-style containers using only standard Linux commands.
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Linux Namespaces