Docker Tutorial

The “works on my machine” problem Software behaves differently across laptops, CI servers and production because each machine has its own operating-system libraries, language ...

Install Docker On Windows and macOS, install Docker Desktop from docker.com – it bundles the engine, CLI and a dashboard. On Linux, install Docker Engine from your distribution’s ...

What a Dockerfile is A Dockerfile is a plain-text recipe that tells Docker how to build an image, one instruction per line. Each instruction creates a new read-only layer ; layers ...

Containers are ephemeral When you remove a container, everything written inside it disappears. That is fine for stateless apps, but a database needs its files to survive restarts. ...

Why Compose Real applications are several containers: a web app, a database, maybe a cache. Starting each with a long docker run command and wiring networks by hand is tedious and ...

Smaller images with multi-stage builds Build tools (compilers, dev dependencies) do not belong in the final image. A multi-stage build compiles in one stage and copies only the ...