7. Testing, Docker & CI/CD
Docker & Reproducible Environments
Package applications consistently and understand image security, runtime configuration and process boundaries.
Lesson overview
Containers improve reproducibility but still need secure runtime design. Use small images, multi-stage builds, non-root users where possible, runtime secrets and disposable containers.
Learning path
Theory → Example → Code → Practice → Quiz → Challenge → Completion
Step 1
Theory
Containers improve reproducibility but still need secure runtime design. Use small images, multi-stage builds, non-root users where possible, runtime secrets and disposable containers.
Step 2
Example
Build TypeScript in one stage and copy only production artifacts into a smaller runtime image. Persistent data belongs in managed storage.
Step 3
Code
dockerfile
FROM node:22-alpine AS build
WORKDIR /app
COPY package*.json ./
RUN npm ci
COPY . .
RUN npm run build
Step 4
Practice
Review your current application and apply Docker & Reproducible Environments. Document the current behavior, one production risk, the change you would make, and how you would verify it.
Step 5
Quiz
1. What is the central production concern in "Docker & Reproducible Environments"?
Step 6
Challenge
Design a production-ready implementation for Docker & Reproducible Environments. Include failure handling, security considerations, observability, testing and a rollback or recovery path where applicable.
Complete every stage
Work through every step in order, then the lesson will be marked complete.
Each chapter and subtopic has its own public URL under /full-stack-to-production.