Kickass Development Environments with Docker (PHPWarks, April, 2017)

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. Hi PHPWarks!
2. Kickass Development Environments with Docker
12. @rawkode Organiser of Things: ◍ ScotlandPHP ◍ Docker Glasgow ◍ DevOps Glasgow ◍ MongoDB Glasgow ◍ PairProg Glasgow Consultant: ◍ PHP / Go / Elixir ◍ Docker / CI / CD ◍ DevOps / SaltStack ◍ Event-Driven Systems ◍ CQRS / ES
13. Let’s address the whale in the room ...
14. Docker & Moby Moby ◍ containerd ◍ RunC ◍ Libnetwork ◍ Compose ◍ Notary ◍ All the Kits Docker, Inc. ◍ Docker CE ◍ Docker EE
15. Kickass Development Environments with DockerCE™©®
16. Let us travel through time ...
17. My Development Environment 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
18. My Development Production Environment 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
19. Things eventually got better ...
22. Dev / Prod Parity
23. Eurgh, DSL Hell
25. Problems with Vagrant Slow to provision RAM intensive Really, development only Requires a CM tool
26. How long does your vagrant up take?
28. “ Docker allows you to package an application with all of its dependencies into a standardized unit for software development.
29. Docker ◍ Image Builder ◍ Virtualisation ◍ Image Delivery ◍ Orchestration (Dev) ➔ docker build ➔ docker run ➔ docker push / pull ➔ docker-compose
30. Image Building Introducing the Dockerfile
31. (Simplified) Dockerfile for PHP FROM ubuntu:17.04 RUN apt install -y php-cli COPY hello.php /code WORKDIR /code ENTRYPOINT [“php”] CMD [“-v”]
32. (Simplified) Dockerfile for PHP FROM ubuntu:17.04 RUN apt install -y php-cli COPY hello.php /code WORKDIR /code ENTRYPOINT [“php”] CMD [“-v”]
33. (Simplified) Dockerfile for PHP FROM ubuntu:17.04 RUN apt install -y php-cli COPY hello.php /code WORKDIR /code ENTRYPOINT [“php”] CMD [“-v”]
34. (Simplified) Dockerfile for PHP FROM ubuntu:17.04 RUN apt install -y php-cli COPY hello.php /code WORKDIR /code ENTRYPOINT [“php”] CMD [“-v”]
35. (Simplified) Dockerfile for PHP FROM ubuntu:17.04 RUN apt install -y php-cli COPY hello.php /code WORKDIR /code ENTRYPOINT [“php”] CMD [“-v”]
37. ENTRYPOINT & CMD Explained in 20 seconds
38. ENTRYPOINT and CMD Explained in 17 seconds ... CMD [“echo”, “Hello”] in a Dockerfile docker run my-image == $ Hello
39. ENTRYPOINT and CMD Explained in 13 seconds ... CMD [“echo”, “Hello”] in a Dockerfile docker run my-image echo Goodbye == $ Goodbye
40. ENTRYPOINT and CMD Explained in 10 seconds ... ENTRYPOINT [“echo”] CMD [“Hello”] in a Dockerfile docker run my-image == $ Hello
41. ENTRYPOINT and CMD Explained in 7 seconds ... ENTRYPOINT [“echo”] CMD [“Hello”] in a Dockerfile docker run --entrypoint=”echo” my-image Woop! == $ Woop!
42. ENTRYPOINT and CMD Explained in 4 seconds ... ENTRYPOINT [“echo”] CMD [“Hello”] in a Dockerfile docker run --entrypoint=”echo” my-image == $
44. Docker ◍ Image Builder ◍ Virtualisation ◍ Image Delivery ◍ Orchestration (Dev) ➔ docker build ➔ docker run ➔ docker push / pull ➔ docker-compose
45. Virtualisation Running Docker Images as Containers
46. Demo
47. Docker ◍ Image Builder ◍ Virtualisation ◍ Image Delivery ◍ Orchestration (Dev) ➔ docker build ➔ docker run ➔ docker push / pull ➔ docker-compose
48. Orchestration (Dev) Composing Services
49. Your Super Application
50. Your Super Application
51. Docker Compose
52. docker-compose.yml version: “3”
53. docker-compose.yml version: “3” services: php: image: php:7 ports: - 80:80 volumes: - .:/code
54. docker-compose.yml version: “3” services: php: image: php:7 … database: image: mariadb:latest environment: MYSQL_USERNAME: rawkode MYSQL_PASSWORD: *******
55. docker-compose.yml version: “3” services: php: image: php:7 … database: image: mariadb:latest environment: MYSQL_USERNAME: rawkode MYSQL_PASSWORD: *******
56. docker-compose.yml version: “3” services: php: image: php:7 healthcheck: test: nc -z localhost 80 depends_on: database: condition: service_healthy
57. Demo
58. Docker ◍ Image Builder ◍ Virtualisation ◍ Image Delivery ◍ Orchestration (Dev) ➔ docker build ➔ docker run ➔ docker push / pull ➔ docker-compose
59. Tips I’ve learnt the hard way, so you don’t have to
60. Tips: Use Random Ports services: php: ports: - 80
61. Tips: Mindful of Network Collisions Every new docker-compose file is, potentially, a new docker network / bridge on your host. Eventually, you’ll get a collision docker-compose down
62. Tips: Prune docker system prune Docker CE >= 17.04
63. Tips: “Enterprise” Networks Start the Docker Engine with --dns or use dns: inside docker-compose.yml
64. Tips: env_file Lots of environment variables defined inside compose.yml? Duplication? env_file: - some file
65. Tips: Alpine Linux Unless you need Ubuntu / Fedora, use Alpine Linux Ubuntu -- 130MB Alpine -- 3.99MB
66. Tips: Keep a Single Dockerfile Using ONBUILD, you can usually keep your project to a single Dockerfile ONBUILD COPY . /code echo “FROM base” > Dockerfile
67. Tips: Routine Build of Base Images There’s no build cascading, ensure you have nightly / weekly / regular triggers on images that aren’t modified often
68. Tips: Alias Everything docker-compose run --rm -it \ php cache:clear Vs. dcr php cache:clear
69. Tips: Be Lazy! Boilr github:tmrts/boilr github:rawkode/boilr-docker-compose-php
70. Docker in Production Next Time ... or ask me in the pub!
71. Docker ◍ Image Builder ◍ Virtualisation ◍ Image Delivery ◍ Orchestration (Dev) ◍ Log Collection ◍ Resource Management ◍ Orchestration (Prod) ◍ Secret Management ➔ docker build ➔ docker run ➔ docker push / pull ➔ Docker-compose ➔ docker run ➔ docker run ➔ docker swarm ➔ docker secret
72. Questions?