Kickass Development Environments with Docker (PHPBenelux 2019)

Transcript

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   Hi #phpbnl19

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   Kickass Development Environments with Docker

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   @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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   Let us travel through time ...

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   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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   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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   Things eventually got better ...

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   None
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   None
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    Dev / Prod Parity

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    Eurgh, DSL Hell

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    None
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    Problems with Vagrant Slow to provision RAM intensive Really, development

    only Requires a CM tool
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    How long does your vagrant up take?

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    None
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    “ Docker allows you to package an application with all

    of its dependencies into a standardized unit for software development.
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    Docker ◍ Image Builder ◍ Virtualisation ◍ Image Delivery ◍

    Orchestration (Dev) ➔ docker build ➔ docker run ➔ docker push / pull ➔ docker-compose
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    Image Building Introducing the Dockerfile

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    (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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    (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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    (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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    (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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    (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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    None
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    ENTRYPOINT & CMD Explained in 20 seconds

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

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

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

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

    CMD [“Hello”] in a Dockerfile docker run --entrypoint=”echo” my-image == $
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    None
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    Docker ◍ Image Builder ◍ Virtualisation ◍ Image Delivery ◍

    Orchestration (Dev) ➔ docker build ➔ docker run ➔ docker push / pull ➔ docker-compose
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    Virtualisation Running Docker Images as Containers

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    Demo

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    Docker ◍ Image Builder ◍ Virtualisation ◍ Image Delivery ◍

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

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    Your Super Application

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    Your Super Application

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    Docker Compose

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    docker-compose.yml version: “3”

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

    volumes: - .:/code
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    docker-compose.yml version: “3” services: php: image: php:7 … database: image:

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

    mariadb:latest environment: MYSQL_USERNAME: rawkode MYSQL_PASSWORD: *******
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    docker-compose.yml version: “3” services: php: image: php:7 healthcheck: test: nc

    -z localhost 80 depends_on: - database
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    Demo

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    Docker ◍ Image Builder ◍ Virtualisation ◍ Image Delivery ◍

    Orchestration (Dev) ➔ docker build ➔ docker run ➔ docker push / pull ➔ docker-compose
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    Tips I’ve learnt the hard way, so you don’t have

    to
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    Tips: Use Random Ports services: php: ports: - 80

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    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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    Tips: Prune docker system prune Docker CE >= 17.04

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    Tips: env_file Lots of environment variables defined inside compose.yml? Duplication?

    env_file: - some file
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    Tips: Alpine Linux Unless you need Ubuntu / Fedora, use

    Alpine Linux Ubuntu -- 130MB Alpine -- 3.99MB
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    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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    Tips: Don’t Bust Your Build Cache COPY composer.json /code RUN

    composer install COPY . /code
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    Tips: Logging ALWAYS LOG to STDOUT

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    Production Tip Mandatory Requirement --read-only

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    Warning Microservices

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    “ That which is old will be new again

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    Microservices

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    Microservices

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    Microservices

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    Microservices

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    Microservices

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    What is old will be new again Shared Kubernetes Dev

    Server
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    Microservices

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

    github.com/telepresenceio/telepresence
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    Shared Kubernetes Dev Server Tooling Istio github.com/istio/istio Linkerd linkerd/linkerd2 Consul

    Connect github.com/hashicorp/consul
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    Creating a fast Kubernetes Development Workflow Bastian Hofmann / 1140

    / Track B
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    Questions?