Docker: Multi-stage multi-environment Abdala Cerqueira

Dockerfile

FROM COPY --from= docker build --target

Problems

Problem 1 ● Keep different Dockerfiles per environment ● ! dev tools and dependencies on production

Problem 2 ● Big, huge, immense images ● One or two commands may leave images out of control

Dependencies

Checklist ● Have only one Dockerfile ● Use the same Dockerfile for all environments (dev, test, prod) ● Create small images ● Manage less dependencies

Official PHP image ● One Dockerfile ● All environments ● Small images ● Less dependencies Time: ~39s Size: 430MB Security problems

Multi-stage

Official PHP image multi-stage ● One Dockerfile ● All environments ● Small images ● Less dependencies Time: ~40s Size: 393MB Not that small, hidden dependencies

Alpine image ● One Dockerfile ● All environments ● Small images ● Less dependencies Time: ~11s Size: 59.4MB Still have unwanted dependencies

Alpine image multi-stage ● One Dockerfile ● All environments ● Small images ● Less dependencies Time: ~16s Size: 35.8MB This is ART <3

Comparison table Image Time Size alpine:3.8 - 4.41 MB php:7.2-apache - 377 MB laravel-apache 39s 430 MB laravel-apache-multi 40s 393 MB laravel-alpine 11s 59.4 MB laravel-alpine-multi 16s 35.8 MB

Conclusion ● Care about dependencies ● Try different techniques

Thanks!