Build Your Own Container Runtime in Go: From Zero to a Running Isolated Process
The article details the creation of a minimal container runtime in Go called gocount, demonstrating how containers leverage Linux kernel features rather than virtual machines. It explains how namespaces, cgroups v2, and pivot_root enable process isolation, resource limits, and filesystem independence. The project provides hands-on understanding of core container technologies like those used in Docker and Podman.
- ▪The container runtime gocount isolates processes using Linux namespaces for PID, hostname, mount, and network separation.
- ▪cgroup v2 is used to enforce memory and CPU limits by writing limits and process IDs into the cgroup filesystem.
- ▪pivot_root is implemented to securely change the root filesystem, preventing escape to the host filesystem.
- ▪The runtime boots an Alpine Linux shell with its own filesystem, network, and resource constraints using only Go and Linux kernel features.
- ▪Root access and kernel 5.10+ are required due to dependencies on Linux-specific features like cgroup v2 and namespace isolation.
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try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3912705) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Shubham Nainwal Posted on May 17 Build Your Own Container Runtime in Go: From Zero to a Running Isolated Process #containers #docker #go #cli I built gocount as a way to actually understand what Docker does under the hood. By the end of this post you'll have a working container runtime that boots an Alpine Linux shell in its own filesystem, PID tree, hostname, and network, with enforced memory and CPU limits, using nothing but Go and Linux kernel features.
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