LaraconEU 2018 - Kickass Development Environments with Docker

Transcript

1. Hello, LaraconEU 2018

2. @rawkode @david@rawkode.com Organiser of Things ◍ Cloud Native Glasgow ◍

   DevOps Glasgow ◍ MongoDB Glasgow ◍ PairProg Glasgow Software & Site Reliability ◍ Elixir / Rust / Go / Pony ◍ Docker / CI / CD ◍ DevOps / SaltStack ◍ Event-Driven Systems ◍ CQRS / ES

3. Kickass Development Environments with Docker

4. Let us travel through time ...

5. 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

6. 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

7. Things eventually got better ...

8. None
9. None

10. Dev / Prod Parity

11. Eurgh, DSL Hell

12. None

13. Problems with Vagrant Slow to provision RAM intensive Really, development

    only Requires a CM tool

14. How long does your vagrant up take?

15. None

16. “ Docker allows you to package an application with all

    of its dependencies into a standardized unit for software development.

17. Docker ◍ Image Builder ◍ Image Delivery ◍ Virtualisation ◍

    Orchestration (Dev) ➢ docker image build ➢ docker image push/ll ➢ docker container run ➢ docker-compose Build. Ship. Run.

18. Image Building Introducing the Dockerfile

19. (Simplified) Dockerfile for PHP FROM ubuntu:18.04 RUN apt install -y

    php-cli COPY hello.php /code WORKDIR /code ENTRYPOINT [“php”] CMD [“-v”]

20. (Simplified) Dockerfile for PHP FROM ubuntu:18.04 RUN apt install -y

    php-cli COPY hello.php /code WORKDIR /code ENTRYPOINT [“php”] CMD [“-v”]

21. (Simplified) Dockerfile for PHP FROM ubuntu:18.04 RUN apt install -y

    php-cli COPY hello.php /code WORKDIR /code ENTRYPOINT [“php”] CMD [“-v”]

22. (Simplified) Dockerfile for PHP FROM ubuntu:18.04 RUN apt install -y

    php-cli COPY hello.php /code WORKDIR /code # PLEASE DON’T DO RUN cd /code

23. (Simplified) Dockerfile for PHP FROM ubuntu:18.04 RUN apt install -y

    php-cli COPY hello.php /code WORKDIR /code ENTRYPOINT [“php”] CMD [“-v”]
24. None

25. ENTRYPOINT & CMD Explained in 20 seconds

26. ENTRYPOINT and CMD Explained in 17 seconds ... CMD [“echo”,

    “Hello”] in a Dockerfile docker run my-image == $ Hello

27. ENTRYPOINT and CMD Explained in 13 seconds ... CMD [“echo”,

    “Hello”] in a Dockerfile docker run my-image echo Goodbye == $ Goodbye

28. ENTRYPOINT and CMD Explained in 10 seconds ... ENTRYPOINT [“echo”]

    CMD [“Hello”] in a Dockerfile docker run my-image == $ Hello

29. ENTRYPOINT and CMD Explained in 7 seconds ... ENTRYPOINT [“echo”]

    CMD [“Hello”] in a Dockerfile docker run --entrypoint=”echo” my-image Woop! == $ Woop!

30. ENTRYPOINT and CMD Explained in 4 seconds ... ENTRYPOINT [“echo”]

    CMD [“Hello”] in a Dockerfile docker run --entrypoint=”echo” my-image == $
31. None

32. Docker ◍ Image Builder ◍ Image Delivery ◍ Virtualisation ◍

    Orchestration (Dev) ➔ docker image build ➔ docker image push/ll ➔ docker container run ➔ docker-compose

33. Image Delivery & Virtualisation Running Docker Images as Containers

34. Demo

35. Docker ◍ Image Builder ◍ Image Delivery ◍ Virtualisation ◍

    Orchestration (Dev) ➔ docker build ➔ docker push / pull ➔ docker run ➔ docker-compose

36. Orchestration (Dev) Composing Services

37. Your Super Application

38. Your Super Application

39. Docker Compose

40. Docker for Local Development 4 Easy Steps. I’ll discuss 3.

    1. Satisfy Dependencies 2. Introduce Docker for CI 3. Adopt Docker Shell Pattern 4. 12-Factor (Catch Alex’s talk on YouTube)

41. Satisfy Dependencies PostgreSQL, Redis, Elasticsearch, et al.

42. docker-compose.yml services: database: image: mariadb:10.1 environment: MYSQL_USER: rawkode MYSQL_PASSWORD: *******

    MYSQL_DATABASE: my-awesome-app

43. docker-compose.yml version: “2.4”

44. docker-compose.yml version: “2.4” services: php: image: php:7 ports: - 80:80

    volumes: - .:/code:cached tmpfs: - /code/var/logs - /code/var/cache

45. docker-compose.yml version: “2.4” services: php: image: php:7 … database: image:

    mariadb:10.1 environment: MYSQL_USERNAME: rawkode MYSQL_PASSWORD: *******

46. docker-compose.yml version: “2.4” services: php: image: php:7 healthcheck: test: nc

    -z localhost 80 depends_on: database: condition: service_healthy

47. Introduce Docker to CI Craft Your Dockerfile

48. Docker for CI ◍ Multi-Stage Builds ◍ Mind Your Build-Cache

    ◍ Be Wary of “Helper” Scripts ◍ We’ll cover these in the demo

49. Docker Shell Maintain Native Workflows

50. Docker Shell Pattern ◍ Your base container has all your

    system dependencies (Don’t use --ignore-platform-reqs) ◍ Work natively, but in the container ◍ You’ll still get all the perks

51. Demo

52. Docker ◍ Image Builder ◍ Virtualisation ◍ Image Delivery ◍

    Orchestration (Dev) ➔ docker build ➔ docker run ➔ docker push / pull ➔ docker-compose

53. Tips I’ve learnt the hard way, so you don’t have

    to

54. Zsh Plugin https://github.com /rawkode /zsh-docker-run

55. Tips: Don’t Bust Your Build Cache COPY composer.json /code RUN

    composer install COPY . /code

56. 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 Add -v to remove volumes

57. Tips: Logging ALWAYS LOG to STDOUT

58. Tips: Prune docker system prune Docker CE >= 17.04

59. Tips: Alpine Linux Unless you need Ubuntu / Fedora, use

    Alpine Linux Ubuntu -- 130MB / 85MB Alpine -- 3.99MB

60. Production Tip nginx & fpm --volumes-from=php

61. Production Tip Open Census Open Metrics Open Tracing

62. Production Tip Mandatory Requirement --read-only

63. Thank You! Questions? @david@rawkode.com @rawkode