Docker Basics for Frontend and Web Development

Docker Basics for Web Development

Docker packages your app and its dependencies in a container – the runnable image works the same everywhere. For web dev that means: same Node version, same env vars, and a simple docker compose up instead of “install Node 20, then MongoDB, etc.”.

Key concepts

Image – template (e.g. node:20-alpine). Contains OS and software.
Container – running instance from an image. Isolated process.
Dockerfile – recipe to build an image: base image, COPY files, RUN commands, CMD to start.
docker-compose.yml – describes one or more containers (app, DB, Redis) and how they connect.

Typical Dockerfile for Next.js

Node base image, copy package.json, install, copy code, build, expose 3000, CMD start. In production multi-stage builds are common – one stage for build, another for run – for a smaller final image.

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Frequently asked questions

Why use Docker for frontend?

Same environment for everyone and for production, easy project start (docker compose up), isolated dependencies. Especially useful when you have backend/DB in the same project.

How do I run Next.js in Docker?

Dockerfile with Node image, COPY code, npm install, npm run build, CMD npm start. Or use the official Next.js Docker image and supply your app.

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