Dockerfile

Summary

A text file of instructions describing how to build a Docker image for your app — base image, dependencies, files to copy, and the command to run.

How to Learn This

1Write a Dockerfile for a Node.js app from scratch.
2Learn common instructions: `FROM`, `WORKDIR`, `COPY`, `RUN`, `CMD`.
3Optimize layer caching by copying `package.json` and installing dependencies before copying the rest of your code.

Docker Basics

Docker Images & Containers

More topics in Docker & Containers

Stuck on this topic? Ask an Insider

Get 1:1 guidance from people who've walked this exact path — free on the InsideEdge app.