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Kickass Development Environments with Docker (P...
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David McKay
January 26, 2019
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Kickass Development Environments with Docker (PHPBenelux 2019)
David McKay
January 26, 2019
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Transcript
Hi #phpbnl19
Kickass Development Environments with Docker
@rawkode David McKay ◍ Developer Advocate at InfluxData ◍ Docker
/ CI / CD ◍ DevOps / SaltStack ◍ Event-Driven Systems ◍ CQRS / ES ◍ Elixir, Go, and Rust
Let us travel through time ...
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
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
Things eventually got better ...
None
None
Dev / Prod Parity
Eurgh, DSL Hell
None
Problems with Vagrant Slow to provision RAM intensive Really, development
only Requires a CM tool
How long does your vagrant up take?
None
“ Docker allows you to package an application with all
of its dependencies into a standardized unit for software development.
Docker ◍ Image Builder ◍ Virtualisation ◍ Image Delivery ◍
Orchestration (Dev) ➔ docker build ➔ docker run ➔ docker push / pull ➔ docker-compose
Image Building Introducing the Dockerfile
(Simplified) Dockerfile for PHP FROM ubuntu:17.04 RUN apt install -y
php-cli COPY hello.php /code WORKDIR /code ENTRYPOINT [“php”] CMD [“-v”]
(Simplified) Dockerfile for PHP FROM ubuntu:17.04 RUN apt install -y
php-cli COPY hello.php /code WORKDIR /code ENTRYPOINT [“php”] CMD [“-v”]
(Simplified) Dockerfile for PHP FROM ubuntu:17.04 RUN apt install -y
php-cli COPY hello.php /code WORKDIR /code ENTRYPOINT [“php”] CMD [“-v”]
(Simplified) Dockerfile for PHP FROM ubuntu:17.04 RUN apt install -y
php-cli COPY hello.php /code WORKDIR /code ENTRYPOINT [“php”] CMD [“-v”]
(Simplified) Dockerfile for PHP FROM ubuntu:17.04 RUN apt install -y
php-cli COPY hello.php /code WORKDIR /code ENTRYPOINT [“php”] CMD [“-v”]
None
ENTRYPOINT & CMD Explained in 20 seconds
ENTRYPOINT and CMD Explained in 17 seconds ... CMD [“echo”,
“Hello”] in a Dockerfile docker run my-image == $ Hello
ENTRYPOINT and CMD Explained in 13 seconds ... CMD [“echo”,
“Hello”] in a Dockerfile docker run my-image echo Goodbye == $ Goodbye
ENTRYPOINT and CMD Explained in 10 seconds ... ENTRYPOINT [“echo”]
CMD [“Hello”] in a Dockerfile docker run my-image == $ Hello
ENTRYPOINT and CMD Explained in 7 seconds ... ENTRYPOINT [“echo”]
CMD [“Hello”] in a Dockerfile docker run --entrypoint=”echo” my-image Woop! == $ Woop!
ENTRYPOINT and CMD Explained in 4 seconds ... ENTRYPOINT [“echo”]
CMD [“Hello”] in a Dockerfile docker run --entrypoint=”echo” my-image == $
None
Docker ◍ Image Builder ◍ Virtualisation ◍ Image Delivery ◍
Orchestration (Dev) ➔ docker build ➔ docker run ➔ docker push / pull ➔ docker-compose
Virtualisation Running Docker Images as Containers
Demo
Docker ◍ Image Builder ◍ Virtualisation ◍ Image Delivery ◍
Orchestration (Dev) ➔ docker build ➔ docker run ➔ docker push / pull ➔ docker-compose
Orchestration (Dev) Composing Services
Your Super Application
Your Super Application
Docker Compose
docker-compose.yml version: “3”
docker-compose.yml version: “3” services: php: image: php:7 ports: - 80:80
volumes: - .:/code
docker-compose.yml version: “3” services: php: image: php:7 … database: image:
mariadb:latest environment: MYSQL_USERNAME: rawkode MYSQL_PASSWORD: *******
docker-compose.yml version: “3” services: php: image: php:7 … database: image:
mariadb:latest environment: MYSQL_USERNAME: rawkode MYSQL_PASSWORD: *******
docker-compose.yml version: “3” services: php: image: php:7 healthcheck: test: nc
-z localhost 80 depends_on: - database
Demo
Docker ◍ Image Builder ◍ Virtualisation ◍ Image Delivery ◍
Orchestration (Dev) ➔ docker build ➔ docker run ➔ docker push / pull ➔ docker-compose
Tips I’ve learnt the hard way, so you don’t have
to
Tips: Use Random Ports services: php: ports: - 80
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
Tips: Prune docker system prune Docker CE >= 17.04
Tips: env_file Lots of environment variables defined inside compose.yml? Duplication?
env_file: - some file
Tips: Alpine Linux Unless you need Ubuntu / Fedora, use
Alpine Linux Ubuntu -- 130MB Alpine -- 3.99MB
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
Tips: Don’t Bust Your Build Cache COPY composer.json /code RUN
composer install COPY . /code
Tips: Logging ALWAYS LOG to STDOUT
Production Tip Mandatory Requirement --read-only
Warning Microservices
“ That which is old will be new again
Microservices
Microservices
Microservices
Microservices
Microservices
What is old will be new again Shared Kubernetes Dev
Server
Microservices
Shared Kubernetes Dev Server Tooling Skaffold github.com/GoogleContainerTools/skaffold Draft github.com/Azure/draft Telepresence
github.com/telepresenceio/telepresence
Shared Kubernetes Dev Server Tooling Istio github.com/istio/istio Linkerd linkerd/linkerd2 Consul
Connect github.com/hashicorp/consul
Creating a fast Kubernetes Development Workflow Bastian Hofmann / 1140
/ Track B
Questions?