How does container networking is implemented under the hood? Setting up Docker-like container networking from scratch. Bonus: podman rootless container networking explained.

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How to virtualize network resources to make containers think each of them has a dedicated network stack. How to turn containers into friendly neighbors, prevent them from interfering, and teach to communicate well? How to reach containers running on a machine from the outside world (aka port publishing)? While answering these questions, we'll setup a container networking from scratch.

How Container Networking Works: Practical Explanation

Isolating containers with network namespaces

Connecting containers to host with virtual Ethernet devices (veth)

Interconnecting containers with virtual network switch (bridge)

Reaching out to the outside world (IP routing and masquerading)

Letting the outside world reach out to containers (port publishing)

Bonus: rootless containers and networking