This is a brief follow up to my article on Docker networking: Network Namespaces, Docker Bridge and DNS Docker uses OverlayFS to manage the file system of its containers. When a container is run, Docker creates a new layer for the container’s file system on top of the base image. This allows the container to have its own file system that is isolated from the host system and other containers.

Ever wondered how docker compose lets you communicate between services? This article takes a high level look at network namespaces, Dockers internal DNS and Docker bridge. Network namespaces are a powerful feature in Linux that allows for the isolation of network stacks, creating multiple virtual networks on a single host. This concept is particularly useful for scenarios such as containerization, where each container needs its own independent network stack. In this article we’ll take a look at how docker / docker compose utilize this technology to grant containers network isolation and also take a look at how docker handles cross-container networking.