Docker Tutorials & Guides

Docker packages an application and its dependencies into a portable container image that runs the same on a laptop, a CI runner, or a production server. These guides walk through writing Dockerfiles, building and tagging images, running containers, and pushing to a registry — then move into the practices that matter at scale: multi-stage builds, small and secure base images, layer caching, and healthchecks.

A container is not a virtual machine — it's an isolated process using Linux kernel features (namespaces and cgroups) that shares the host kernel. Understanding that model is what makes the difference between images that are fast and lean and ones that are bloated and slow.