Multi-stage Docker builds to make building easy!
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This document describes using Docker multi-stage builds to build and deploy a typical web application with a React frontend and Go backend. It outlines building each part (frontend and backend) in separate Docker images with the appropriate tools, then copying the artifacts to a final Nginx image for production deployment. This allows building each part in isolation without installing unnecessary tools in the final image, resulting in smaller Docker images for the application.
Multi-stage Docker builds to make building easy!
- 1. TO MAKE BUILDING EASY! Milindu Kumarage Software Engineer Multi-stage Docker builds
- 2. A common man app Let’s talk about a typical web application
- 3. Back-end Implementation • Golang • Needs Golang to compile Front-end Implementation • ReactJS • Needs Yarn and NodeJS to transpile A typical web app A common man app
- 4. Serving static files Static files, the transpiled html,JS,CSS, images, etc will be served by NGINX NGINX Server in the front A common man app Proxying API Calls API calls will be proxied to the Go app
- 5. A common problem How we CI/CD this app?
- 6. • Install NodeJs, Yarn, Golang, etc on CI/CD? • Use some docker magic? A common problem
- 7. A common solution Let’s use some Docker stuff…
- 8. One Docker to rule them all? • Get one Docker, say NodeJS docker. • Then install Golang and Nginx on it? Bit from that, bit from this? • Use NodeJS docker and build the React app, get the build artifacts out • Use Golang docker and build the API, get the build artifacts out • Then copy to Nginx docker? What approach we can use? A common solution
- 9. Docker Version 17.05+ Introducing Docker Multi-stage builds A common solution
- 10. It is like having multiple Dockers but in one! • You can define several stages, using different Docker base images. • You can copy files from one stage to the next stage A common solution Docker Multi-stage builds
- 11. FROM node:9 AS frontend WORKDIR /app/web ADD web . RUN yarn && yarn build FROM golang:alpine AS backend RUN apk add git WORKDIR /go/src/github.com/agentmilindu/web-api ADD src . RUN go get github.com/joho/godotenv github.com/labstack/echo github.com/dgrijalva/jwt-go RUN go install github.com/agentmilindu/web-api FROM nginx:alpine COPY nginx.conf /etc/nginx/conf.d/default.conf COPY --from=frontend /app/web/build /usr/share/nginx/html COPY --from=backend /go/bin/web-api /opt/app/api CMD /opt/app/api
- 12. Your final docker image will have only the needed files No NodeJS, No Yarn, No Golang, Just NGINX, front-end html, JS, CSS, etc and compiled Go app. Small Docker images! A common solution
- 13. Let’s get our hands dirty! Let’s create a multi-stage Docker github.com/agentmilindu/A-typical-web-app
- 14. Thank you