Kickass Development Environments with Docker (Glasgow PHP, March 2016)

Docker, the hottest technology around at the moment. It swept the Ops world by storm in 2014, became mainstream in 2015, and now it’s set to dominate the developer world, in 2016.

Docker is a tool that allows you to package your application up into a single-runnable distributable binary - akin to the phar, but in Hulk mode. Docker allows you, a developer, to specify the exact environment your application needs to run, across development; test; staging; and production.

In this talk I will cover the creation of this utopian distributable and show you how to can compose your entire production infrastructure locally with only a small YAML file and without installing a single thing.

Lets say hello, to Docker.

Transcript

1. Kickass Development Environments with Docker
2. david@rawkode.com @rawkode github.com/rawkode ~ Software Consultant Docker Glasgow Organiser • PHP ~ Go ~ Java ~ Obj-C • CQRS & Event Sourcing • DevOps / CI / CD / Docker • Domain-Driven Design • Framework agnostic code • TDD / BDD
3. What is Docker?
4. What is Docker? Docker allows you to package an application with all of its dependencies into a standardized unit for software development. docker.com
5. What’s the goal? A single, runnable, distributable executable
6. The Docker Family • Docker • Docker Engine • Docker Registry • Docker Compose • Docker Machine • Docker Swarm
7. Docker Image
8. Official Images http://hub.docker.com • php (5.5, 5.6, 7.0) • redis • memcached • elasticsearch • mysql • postgres • mongo • node • rabbitmq • …
9. FROM php:7.0
10. ADD ./ /var/www COPY ./ /var/www Warning: Be careful with ADD
11. WORKDIR /var/www
12. ENTRYPOINT [ “php” ]
13. CMD [ “-v” ]
14. Docker Container
15. Demo
17. Do I have to rebuild my container when I update my code?
18. Docker Volumes
19. … -v `pwd`:/var/www
20. … -v /var/log/apache2
21. … --volumes-from=app
23. Demo
24. I’m on OSX and it’s really really slow!
25. VirtualBoxFs
26. VirtualBox Fileshare is slow ...
27. rsync! https://github.com/rawkode/ docker-developer-utils docker-machine create -d virtualbox \ --virtualbox-no-share \ development
29. Demo
30. That’s great, but what about the database, cache, elasticsearch, etc
31. Project Dependencies
32. Project Dependencies
33. docker run memcached docker run postgres docker run elasticsearch
34. docker run -e APP_ENV=development -v .: /var/www -p 0.0.0.0:10000:80 -- link elasticsearch:elasticsearch -- link postgres:postgres --link memcached:memcached edpug:1
35. Docker Compose
36. application: … links: - redis:redis - postgres:postgres redis: image: redis
37. Docker Compose Demo Let’s setup a project with: • PHP 7 • Elasticsearch • PostgreSQL • memcached … and let’s do it in under one minute* … * docker pull commands done on the train and this text will be too small to read on a projector
39. Docker Tips
40. volumes-from: - cache_and_logs cache_and_logs: - image: busybox - volumes: - /var/www/app/cache - /var/www/app/logs Data Containers Containerised logs and cache!
41. Base Image ONBUILD FTW # Dockerfile ONBUILD COPY . /var/www # docker-compose.yml application: image: base-image volumes: - .:/var/www
42. Arbitrary Commands See docker-developer-tools docker-compose-run-command \ php -v
43. Base Image NIGHTLY BUILDS cron / curl / wget / whatever! FROM your-company:base:latest FROM your-company:base:dev FROM your-company:base:prod
44. Image Size Keep it Lean! RUN DEBIAN_FRONTEND=noninteractive \ apt-get update \ && apt-get install -y \ --no-install-recommends apache2 \ && rm -rf /var/lib/apt/lists/*
45. Image Size GOTCHAS ADD . /var/www RUN chown www-data -R /var/www THIS WILL COST YOU TWICE THE MiBs! Do it at entrypoint, if really needed
46. Image Size If in doubt, check! docker history myimage
47. composer install --ignore-platform-reqs • IDE AutoComplete • Cached to ~/.composer • Not passing keys or tokens to Docker container for satis / private repositories Composer Keep it local
48. Abuse Docker testing-database-pdo: extends: service: testing-php-5.5 environment: - DATABASE_USER=root - DATABASE_PASS=testing - DATABASE_NAME=testing testing-database-mysql: extends: service: testing-database-pdo links: - mysql:mysql environment: - DATABASE_DRIVER=pdo_mysql - DATABASE_HOST=mysql - DATABASE_PORT=3306
49. Questions? Free advice, tweet: @rawkode Not so free, but super-awesome, training for you and/or team? david@rawkode.com Send constructive (ish) feedback to: https://joind.in/talk/5a44f Come chat on: http://slack.scotlandphp.co.uk