Docker Masterclass

Running 10 docker run commands manually with complex flags is tedious and error-prone. Docker Compose allows you to define and run your entire multi-container infrastructure declaratively in a single YAML file.

By default, all files created inside a container are stored on a writable container layer. When that container is deleted, the data is destroyed. Docker Volumes solve this by storing data outside the container filesystem.

How do two containers on the same host talk to each other without exposing ports to the public internet? Docker uses Linux virtual network interfaces (veth pairs) connected to a software bridge.

Shipping a 1GB Docker image containing compilers, debuggers, and build tools to production is a security nightmare. Multi-Stage Builds allow you to separate the build environment from the tiny runtime container.

Containers do not exist as physical entities inside the Linux kernel. A “container” is simply a standard Linux process isolated via Namespaces, throttled by cgroups, and mounted on an Overlay2 union filesystem.

A complete hands-on guide to containerization fundamentals and multi-container orchestration.