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12 FACTOR APP WITH DOCKER
This document discusses how Docker can help developers implement the 12-factor app methodology for building cloud-native applications. It outlines the 12 principles of a 12-factor app and how Docker addresses each principle, such as ensuring portability and scalability across environments through containerization. The document then provides a step-by-step guide for implementing a 12-factor app with Docker, covering aspects like codebase management, dependencies, configuration, processes, networking, logs, and continuous deployment.
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12 FACTOR APP WITH DOCKER
- 1. 12-Factor App withDocker Ophélie Mauger Consultante DevOps - Alter Way
- 2. Why twelve-factor app? ● Maximum portability between environments ● Suitable for deployment on modern cloud platforms ● Scale up ● Minimize time and costs with automation ● Continuous deployment
- 3. Why docker canhelp ? ● Maximum portability between environments ● Suitable for deployment on modern cloud platforms ● Scale up ● Minimize time and costs with automation ● Continuous deployment
- 4. 12 factor Appwith docker step by step codebase dependencies config backing services build, release, run processes port binding concurrency disposability dev/prod parity Logs Admin processes
- 5. I. CodeBase One codebasetracked in revision control
- 6. II. Dependencies Explicitly declare& isolate dependencies
- 7. |||. Config Store configin the environment ● Linux environment variables ● docker-compose can define env variables via env files
- 8. IV. Backing services Treatbacking services as attached ressources ● Linux environment variables ● docker-compose can define env variables via env files ● docker allows you to link services together
- 9. V. Build, Release,Run Strictly separate build and run stages ● docker build --pull -t sampleapi:1.0 . ● docker push sampleapi:1.0 ● docker run sampleapi:1.0
- 10. VI. Processes Execute theapp as one or more stateless processes ● docker enforces stateless processes ● Use volumes to persist data
- 11. Export services viaport binding VII. Port Binding Docker Host service network container http container php-fpm container mysql port binding
- 12. VIII. Concurrency Scale outvia the process model Docker Cluster docker host docker host docker host http php worker worker worker worker http php worker worker worker worker http php worker worker worker worker Workload divercity scale
- 13. IX. Disposability Maximize robustnesswith fast startup and graceful shutdown ● Container restart policies ● Orchestration with docker swarm ● Reverse proxy and load balancing with services containers
- 14. X. Dev/Prod parity Keepdevelopment, staging, and production as similar as possible ● “build once, run anywhere” ● Same app images across DevOps stages
- 15. XI. Logs Treat logsas event streams Dev environment Logs in container stdout >docker logs -f … >docker-compose logs -f Ops environment Log driver : fluentd container fluentd
- 16. XII. Admin processes RunAdmin/management tasks as one of processes docker exec ….
- 17. And what about continuousdeployment ?
- 18. Continuous Delivery withDocker Build stage : ● docker build --pull -t myregistry/myimage:$version ● docker push myregistry/myimage:$version
- 19. Continuous Deployment withdocker Deploy stage : ● Connect to the swarm (export DOCKER_HOST, ...) ● docker-compose pull ● docker-compose up -d
- 20. Conclusion If you planto do a twelve-factor app use docker to make it