How Docker Networking Works: Built From Scratch

When you run docker run, your container instantly gets an IP address, talks to other containers, and connects to the internet. It feels like magic—but there is no magic. There is only the Linux kernel.

In this deep dive, we strip away the abstractions of Docker and Kubernetes to see what container networking really is. We will build Docker's default bridge network entirely from scratch using only raw network namespaces and three core Linux kernel primitives: veth pairs, Linux bridges, and iptables NAT.

Whether you're debugging a broken Kubernetes pod, troubleshooting a CNI plugin, or trying to understand network policies, mastering these underlying mechanisms is essential for any modern DevOps, SRE, or Platform Engineer.

Видео How Docker Networking Works: Built From Scratch канала MattOps | DevOps & SRE