Kickass Development Environments with Docker (PHP Hampshire, July 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 PHP Hampshire July 2016
2. david@rawkode.com @rawkode github.com/rawkode ~ Software Consultant Docker Glasgow Organiser Scotland PHP Organiser Running Docker since 0.4 (June 2013) • PHP / Go / Elixir • DevOps / CI / CD / Docker • CQRS & Event Sourcing • Domain-Driven Design • TDD / BDD
3. let’s travel through time ...
4. Development Environments circa 2000 $ tree awesome-million-pound-project └── src ├── game.php ├── game.php.bk-david ├── game.php.bk-deano ├── main.php ├── main.php.maybe-fixed ├── main.php.bk-1999-12-02 ├── main.php.bk-1999-12-02.2 ├── player.php ├── player.php.orig └── .swp.player.php
5. Production Environments circa 2000 $ tree awesome-million-pound-project └── src ├── game.php ├── game.php.bk-david ├── game.php.bk-deano ├── main.php ├── main.php.maybe-fixed ├── main.php.bk-1999-12-02 ├── main.php.bk-1999-12-02.2 ├── player.php ├── player.php.orig └── .swp.player.php
6. things got better ...
7. but not for another six years ...
9. Dev/Prod parity becomes a twinkle in our eye
11. DSL Hell
13. Vagrant Problems • You’re creating and managing VMs for each project / service • Those VM’s are mutable / prone to error by user changes • They’re built JIT (most cases) • How long goes your vagrant up take?
14. Let’s check out another option
15. What is Docker?
16. What is Docker? Docker allows you to package an application with all of its dependencies into a standardized unit for software development. docker.com
17. What’s the goal? A single, runnable, distributable executable
18. The Docker Family • Docker • Docker Engine • Docker Registry • Docker Compose • Docker Machine • Docker Swarm
19. Docker Image
20. Layering
21. COPY ON WRITE
22. Official Images http://hub.docker.com • php (5.5, 5.6, 7.0) • redis • memcached • elasticsearch • mysql • postgres • mongo • node • rabbitmq • …
23. FROM php:7.0
24. ADD ./ /var/www COPY ./ /var/www Warning: Be careful with ADD
25. WORKDIR /var/www
26. ENTRYPOINT [ “php” ]
27. CMD [ “-v” ]
28. Docker Container
29. Docker Build Demo
31. Do I have to rebuild my container when I update my code?
32. Docker Volumes
33. … -v `pwd`:/var/www
34. … -v /var/log/apache2
35. … --volumes-from=app
36. Docker Volumes Demo
37. I’m on OSX / Windows, and it’s really really slow!
38. Docker on OSX / Windows isn’t native
39. VirtualBoxFs
40. VirtualBox Fileshare is slow ...
41. rsync! github.com /rawkode /docker-developer-utils docker-machine create -d virtualbox \ --virtualbox-no-share \ Development docker-machine-rsync
42. Note: Docker for Windows / Mac Beta is now public availability beta.docker.com
43. That’s great, but what about the database, cache, elasticsearch, etc
44. Project Dependencies
45. Project Dependencies
46. docker run memcached docker run postgres docker run elasticsearch
47. 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 \ app:1
48. Docker Compose
49. version: ‘2’ services: application: image: php-7.0-apache redis: image: redis:version
50. Docker Compose Demo Let’s setup a project with: • PHP 7 • Elasticsearch • PostgreSQL • memcached
51. Boilr! https://github.com/tmrts/boilr
52. Boilr & Docker Compose & PHP https://github.com/rawkode/boilr-docker-compose-php
53. Boilr Demo Let’s setup a project with: • PHP 7 • Elasticsearch • PostgreSQL • memcached
54. Docker Tips
55. 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
56. docker-compose down -v • Stops and removes all containers and networks in the project • -v means delete the volumes as well Down Means Destroy docker-compose down -v
57. FROM alpine:3.3 Alpine Linux ~ 5 MiB (with solid package management!)
58. Base Image ONBUILD FTW # Dockerfile ONBUILD COPY . /var/www # docker-compose.yml application: image: base-image volumes: - .:/var/www # CI build FROM base-image
59. Base Image NIGHTLY BUILDS cron / curl / wget / whatever! # There’s no cascading builds # in Docker. Automate it. FROM your-company:base:latest FROM your-company:base:dev FROM your-company:base:prod
60. Arbitrary Commands github.com /rawkode /docker-developer-utils docker-compose-run-command \ php -v
61. 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/*
62. 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
63. Image Size If in doubt, check! docker history myimage
64. volumes: cache: driver: local logs: driver: local app: - volumes: - cache:/var/www/app/cache - logs:/var/www/app/logs Volumes Containerised logs and cache!
65. 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
66. Thanks for having me! Questions? @rawkode Send constructive (ish) feedback to: joind.in/talk/914c2 Wondering about my broken smile? Ask in the pub :P