Docker Tutorial: Build a Container Filesystem From Scratch (chroot, RootFS & Namespaces)
Most engineers run containers every day but never ask: where does the filesystem actually come from?
In this video, you'll build a container filesystem from scratch using raw Linux commands no Docker, no container runtime. Just the Linux kernel doing its thing.
You'll learn:
🗂️ How Linux Processes See the Filesystem
→ Every process starts at / — the root of the entire Linux file tree
→ Changing what / points to changes everything a process can see
🔧 Build a Custom RootFS From Scratch
→ Create the directory structure (bin, lib64, etc, proc, usr)
→ Copy binaries + shared libraries using ldd and awk
→ The exact same structure Docker uses inside every container
🔒 chroot: The Filesystem Isolation Primitive
→ How chroot locks a process into a specific root directory
→ Why chroot alone isn't enough — and what's still shared
📦 Combine chroot + Namespaces: A Real Container
→ Use unshare to create PID, Mount, UTS & Net namespaces
→ Add chroot — now you have filesystem AND process isolation
→ Your process sees PID 1, its own hostname, its own filesystem
🐳 How Docker & Kubernetes Automate This
→ Docker doesn't do magic — it automates every step you just did
→ Inspect a real nginx container image with Podman
→ Extract the image layers — it's the same filesystem you built manually
📌 This is part of the Kernel Primitives for Containers series, where we
build containers from scratch using raw Linux internals, one kernel
primitive at a time.
📌 Watch the full series → • Linux Kernel Primitives for Containers
▬▬▬▬▬▬▬ Timestamps ▬▬▬▬▬▬▬
00:00 - Intro: The Missing Piece After Namespaces
00:33 - How Linux Processes See the Filesystem
02:05 - Building a Custom RootFS From Scratch
09:54 - How Container Runtimes Use RootFS
10:45 - Combining chroot + Namespaces: A Real Container
13:44 - How Docker & Kubernetes Automate This
14:25 - Inspecting a Real Docker Image Filesystem
16:31 - Outro & Next: OverlayFS Deep Dive
Watch Related Playlists:
Kubernetes Gateway API: • Kubernetes Gateway API Zero to Hero (With ...
Kubernetes: • Kubernetes Basics to Advance
Github Actions: • GitHub Actions: Basics to Advanced
Ansible: • Ansible Automation: From Beginner to Advan...
AWX: • AWX Tutorials: Beginner to Advanced Guide
AI: • AI
▬▬▬▬▬▬ Connect with me ▬▬▬▬▬▬
LinkedIn: / kumar-nikhil811
Website: https://techinik.com
Medium: / kumarnikhil811
#linux #docker #containers #chroot #rootfs #kubernetes #devops #linuxkernel #containerization #k8s #dockertutorials #linuxtutorials
Auf dieser Seite können Sie das Online-Video Docker Tutorial: Build a Container Filesystem From Scratch (chroot, RootFS & Namespaces) mit der Dauer stunde minuten sekunde in guter Qualität ansehen, das der Benutzer Techi Nik 04 April 2026 hochgeladen hat, den Link mit Freunden und Bekannten teilen, dieses Video wurde auf Youtube bereits 873 Mal angesehen und es wurde von 32 den Zuschauern gefallen. Viel Spaß beim Betrachtenden Zuschauern gefallen!
