Kickass Development Environments with Docker (PHPBenelux 2019)

Transcript

1. Hi
   #phpbnl19
   

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2. Kickass Development
   Environments
   with Docker
   

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3. @rawkode
   David McKay
   ◍ Developer Advocate at InfluxData
   ◍ Docker / CI / CD
   ◍ DevOps / SaltStack
   ◍ Event-Driven Systems
   ◍ CQRS / ES
   ◍ Elixir, Go, and Rust
   

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

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18. Image Building
    Introducing the Dockerfile
    

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19. (Simplified) Dockerfile for PHP
    FROM ubuntu:17.04
    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:17.04
    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:17.04
    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:17.04
    RUN apt install -y php-cli
    COPY hello.php /code
    WORKDIR /code
    ENTRYPOINT [“php”]
    CMD [“-v”]
    

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23. (Simplified) Dockerfile for PHP
    FROM ubuntu:17.04
    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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31. View Slide

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

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33. Virtualisation
    Running Docker Images as Containers
    

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34. Demo
    

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35. Docker
    ◍ Image Builder
    ◍ Virtualisation
    ◍ Image Delivery
    ◍ Orchestration (Dev)
    ➔ docker build
    ➔ docker run
    ➔ docker push / pull
    ➔ 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-compose.yml
    version: “3”
    

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41. docker-compose.yml
    version: “3”
    services:
    php:
    image: php:7
    ports:
    - 80:80
    volumes:
    - .:/code
    

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42. docker-compose.yml
    version: “3”
    services:
    php:
    image: php:7
    …
    database:
    image: mariadb:latest
    environment:
    MYSQL_USERNAME: rawkode
    MYSQL_PASSWORD: *******
    

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43. docker-compose.yml
    version: “3”
    services:
    php:
    image: php:7
    …
    database:
    image: mariadb:latest
    environment:
    MYSQL_USERNAME: rawkode
    MYSQL_PASSWORD: *******
    

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44. docker-compose.yml
    version: “3”
    services:
    php:
    image: php:7
    healthcheck:
    test: nc -z localhost 80
    depends_on:
    - database
    

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45. Demo
    

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

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

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48. Tips: Use Random Ports
    services:
    php:
    ports:
    - 80
    

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49. 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
    

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

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51. Tips: env_file
    Lots of environment variables defined
    inside compose.yml? Duplication?
    env_file:
    - some file
    

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

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53. Tips: Keep a Single Dockerfile
    Using MultiStage Builds, you can usually
    keep your project to a single Dockerfile
    FROM node AS node
    RUN npm install
    FROM php
    COPY --from=node assets
    

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

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55. Tips: Logging
    ALWAYS
    LOG
    to
    STDOUT
    

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56. Production Tip
    Mandatory Requirement
    --read-only
    

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57. Warning
    Microservices
    

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58. “
    That which is old will be new again
    

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59. Microservices
    

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60. Microservices
    

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61. Microservices
    

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62. Microservices
    

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63. Microservices
    

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64. What is old will be new again
    Shared Kubernetes Dev
    Server
    

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65. Microservices
    

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66. Shared Kubernetes Dev Server
    Tooling
    Skaffold
    github.com/GoogleContainerTools/skaffold
    Draft
    github.com/Azure/draft
    Telepresence
    github.com/telepresenceio/telepresence
    

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67. Shared Kubernetes Dev Server
    Tooling
    Istio
    github.com/istio/istio
    Linkerd
    linkerd/linkerd2
    Consul Connect
    github.com/hashicorp/consul
    

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68. Creating a fast Kubernetes
    Development Workflow
    Bastian Hofmann / 1140 / Track B
    

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69. Questions?
    

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