Docker from a team perspective

Edwin Vlieg - MoneyBird

€

Ruby Postgres

OSX

UnicornProject

Ruby Postgres

OSX

Ruby Postgres

OSX

Ruby Postgres

Linux

UnicornProject UnicornProject UnicornProject

Ruby Postgres

OSX

Ruby Postgres

OSX

Ruby Postgres

Linux

UnicornProject UnicornProject UnicornProject

We need GraphicsMagick

Ruby Postgres

OSX

Ruby Postgres

OSX

Ruby Postgres

Linux

UnicornProject UnicornProject UnicornProject

You need GraphicsMagick!

GM

OSX

Ruby Postgres

OSX Linux

UnicornProject UnicornProject UnicornProject

You need GraphicsMagick!

GMRuby Postgres GM Ruby Postgres GM

30 minutes 15 minutes

Development

• Always changing dependencies in projects

• Keeping up with changes takes away productivity

• Differences as small as a different patch level or different compile time argument can mean hours of debugging.

After development

• Continuous Integration

• Staging environment

• Production environment

Ruby 2.1 Postgres

OS

UnicornProject

Ruby 2.0 Redis

Memcache

ElasticSearch

StorageProject

Ruby 2.1 Postgres GM

GhostScript

PrinceXML

We tried

• Automated provisioning of environments

• Vagrant boxes with dependencies

OSX

Ruby Postgres

OSX Linux

UnicornProject UnicornProject UnicornProject

GMRuby Postgres GM Ruby Postgres GM

Image

Image

“A Docker image is a read-only template.”

StorageProject

Ingredients Ubuntu OpenSSL Ruby Bundler GraphicsMagick PrinceXML Source code

ImageStorageProject

DockerfileFROM ubuntuRUN apt-get install opensslRUN apt-get install rubyRUN gem install bundlerRUN apt-get install gmRUN princexml/install.shADD ./src/storage_project

Image

• Create image from Dockerfile

• Run image to create a container running the dependencies and source code

• Result is the same on every host computer able to run a Docker host (Linux).

Ruby Postgres

OSX

Ruby Postgres

OSX

Ruby Postgres

Linux

UnicornProject UnicornProject UnicornProject

ADD apt-get install gm

OSX

Ruby Postgres

OSX Linux

UnicornProject UnicornProject UnicornProject

Pull new image!

GMRuby Postgres GM Ruby Postgres GM

30 seconds 30 seconds

Docker vs VMs

AppA

Hypervisor (Type 2)

Host OS

Server

GuestOS

Bins/Libs

AppA’

GuestOS

Bins/Libs

AppB

GuestOS

Bins/Libs

VM

GuestOS

GuestOS

App A

Docker

Host OS

Server

App A

Bins/Libs

App B

App B

App B

App BContainer

Bins/Libs

Backing services

• We try to serve only 1 service in an image

• Backing services like Postgres, Redis, ElasticSearch, Memcached have their own images

Conclusion

• Docker makes dependency management and cooperation on projects way easier!

• Less downtime during development and in production due to clear definition of required environment.