LaraconEU 2018 - Kickass Development Environments with Docker

Transcript

1. Hello,
   LaraconEU
   2018
   

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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
   

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3. Kickass Development
   Environments
   with Docker
   

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4. Let us travel through time ...
   

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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
   

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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
   

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7. Things eventually got better ...
   

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10. Dev / Prod Parity
    

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11. Eurgh, DSL Hell
    

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13. Problems with Vagrant
    Slow to provision
    RAM intensive
    Really, development only
    Requires a CM tool
    

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14. How long does your vagrant up take?
    

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16. “
    Docker allows you to package an
    application with all of its dependencies into
    a standardized unit for software
    development.
    

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17. Docker
    ◍ Image Builder
    ◍ Image Delivery
    ◍ Virtualisation
    ◍ Orchestration (Dev)
    ➢ docker image build
    ➢ docker image push/ll
    ➢ docker container run
    ➢ docker-compose
    Build. Ship. Run.
    

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18. Image Building
    Introducing the Dockerfile
    

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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”]
    

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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”]
    

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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”]
    

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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
    

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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”]
    

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25. ENTRYPOINT & CMD
    Explained in 20 seconds
    

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26. ENTRYPOINT and CMD Explained in 17 seconds ...
    CMD [“echo”, “Hello”]
    in a Dockerfile
    docker run my-image
    ==
    $ Hello
    

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27. ENTRYPOINT and CMD Explained in 13 seconds ...
    CMD [“echo”, “Hello”]
    in a Dockerfile
    docker run my-image echo Goodbye
    ==
    $ Goodbye
    

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28. ENTRYPOINT and CMD Explained in 10 seconds ...
    ENTRYPOINT [“echo”]
    CMD [“Hello”]
    in a Dockerfile
    docker run my-image
    ==
    $ Hello
    

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29. ENTRYPOINT and CMD Explained in 7 seconds ...
    ENTRYPOINT [“echo”]
    CMD [“Hello”]
    in a Dockerfile
    docker run --entrypoint=”echo” my-image Woop!
    ==
    $ Woop!
    

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30. ENTRYPOINT and CMD Explained in 4 seconds ...
    ENTRYPOINT [“echo”]
    CMD [“Hello”]
    in a Dockerfile
    docker run --entrypoint=”echo” my-image
    ==
    $
    

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32. Docker
    ◍ Image Builder
    ◍ Image Delivery
    ◍ Virtualisation
    ◍ Orchestration (Dev)
    ➔ docker image build
    ➔ docker image push/ll
    ➔ docker container run
    ➔ docker-compose
    

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33. Image Delivery
    &
    Virtualisation
    Running Docker Images as Containers
    

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34. Demo
    

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35. Docker
    ◍ Image Builder
    ◍ Image Delivery
    ◍ Virtualisation
    ◍ Orchestration (Dev)
    ➔ docker build
    ➔ docker push / pull
    ➔ docker run
    ➔ docker-compose
    

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36. Orchestration (Dev)
    Composing Services
    

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37. Your Super Application
    

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38. Your Super Application
    

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39. Docker Compose
    

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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)
    

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

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

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43. docker-compose.yml
    version: “2.4”
    

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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
    

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45. docker-compose.yml
    version: “2.4”
    services:
    php:
    image: php:7
    …
    database:
    image: mariadb:10.1
    environment:
    MYSQL_USERNAME: rawkode
    MYSQL_PASSWORD: *******
    

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46. docker-compose.yml
    version: “2.4”
    services:
    php:
    image: php:7
    healthcheck:
    test: nc -z localhost 80
    depends_on:
    database:
    condition: service_healthy
    

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47. Introduce Docker to CI
    Craft Your Dockerfile
    

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48. Docker for CI
    ◍ Multi-Stage Builds
    ◍ Mind Your Build-Cache
    ◍ Be Wary of “Helper” Scripts
    ◍ We’ll cover these in the demo
    

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49. Docker Shell
    Maintain Native Workflows
    

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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
    

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51. Demo
    

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52. Docker
    ◍ Image Builder
    ◍ Virtualisation
    ◍ Image Delivery
    ◍ Orchestration (Dev)
    ➔ docker build
    ➔ docker run
    ➔ docker push / pull
    ➔ docker-compose
    

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

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

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

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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
    

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57. Tips: Logging
    ALWAYS
    LOG
    to
    STDOUT
    

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

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59. Tips: Alpine Linux
    Unless you need Ubuntu / Fedora, use
    Alpine Linux
    Ubuntu -- 130MB / 85MB
    Alpine -- 3.99MB
    

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

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61. Production Tip
    Open Census
    Open Metrics
    Open Tracing
    

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62. Production Tip
    Mandatory Requirement
    --read-only
    

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

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