□ TL DR: This is a collection of Docker advice that is not related directly to Node.js - the Node implementation is not much different than any other language: ✓ Prefer COPY over ADD command □ Otherwise: Dying immediately means not responding to thousands of disappointed users ✍□ Code Example - Placing Node.js as the root process allows passing signals to the code FROM node:12-slim # Build logic comes here CMD #This line above will make Node.js the root process (PID1) ✍□ Code Example - Using Tiny process manager to forward signals to Node FROM node:12-slim # Build logic comes here ENV TINI_VERSION v0.19.0 ADD $_b trivy image □ More examples and further explanations Achieving this demands some thoughtful code to orchestrate several moving parts: The load balancer, keep-alive connections, the HTTP server and other resources In Dockerized runtimes shutting down containers is not a rare event, rather a frequent occurrence that happen as part of routine work. This should be done while responding to ongoing requests. □ TL DR: Handle the process SIGTERM event and clean-up all existing connection and resources. RUN npm install -production CMD □ More examples and further explanations. RUN npm install & npm run build FROM node:slim-14.4.0 USER node EXPOSE 8080 COPY -from=build /home/node/app/dist /home/node/app/package.json /home/node/app/package-lock.json. ✍□ Code Example - Dockerfile for multi-stage builds FROM node:14.4.0 AS build COPY. □ Otherwise: Larger images will take longer to build and ship, build-only tools might contain vulnerabilities and secrets only meant for the build phase might be leaked. Multi-stage builds are an easy way to get rid of overweight and security threats With multi-stage builds these resources can be used during build while the runtime environment contains only what’s necessary. A lot of build-time dependencies and files are not needed for running your application. □ TL DR: Use multi-stage build to copy only necessary production artifacts. Get weekly best practices via our Twitter feed ✅ 1 Use multi-stage builds for leaner and more secure Docker images
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