Docker introduction

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Docker introduction

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Introduction to Docker
November, 2013

Contents
• Introduction to Docker, Containers, and the Matrix from Hell
• Why people care: Separation of Concerns
• Techni...

In the 8 months since we launched
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>200,000 pulls
>7,500 github stars
>200 significant contributors
>200 projects ...

Why all the excitement?

User DB

Static website

postgresql + pgv8 + v8

nginx 1.5 + modsecurity + openssl + bootstrap 2

Background workers
Pytho...

The Matrix From Hell
Static website

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Web frontend

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Background workers

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Multiplicity of Goods

Do I worry about
how goods interact
(e.g. coffee beans
next to spices)

Can I transport quickly
and...

Also a matrix from hell
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A standard container that is
loaded with virtually any
goods, and stays sealed until
it reaches final delivery.
…in betwee...

Static website

User DB

Web frontend

Queue

Analytics DB

An engine that enables any
payload to be encapsulated
as a lig...

Docker eliminates the matrix from Hell
Static website

Web frontend

Background workers

User DB

Analytics DB

Queue

Dev...

Why Developers Care
• Build once…(finally) run anywhere*
• A clean, safe, hygienic and portable runtime environment for yo...

Why Devops Cares?
• Configure once…run anything
• Make the entire lifecycle more efficient, consistent, and repeatable
• I...

Why it works—separation of concerns
• Dan the Developer
•

Worries about what’s ―inside‖ the
container
•

His Apps

•

•

...

More technical explanation
WHY
• Run everywhere
• Regardless of kernel version
(2.6.32+)
• Regardless of host distro
• Phy...

Containers vs. VMs
App
A

App
A’

App
B

Bins/
Libs

Bins/
Libs

Bins/
Libs

Guest
OS

Guest
OS
Guest
OS

Guest
OS
Guest
O...

Why are Docker containers lightweight?
VMs

Bins/
Libs

Bins/
Libs

Bins/
Libs

Guest
OS

Guest
OS
Guest
OS

Bins/
Libs

O...

What are the basics of the Docker system?
Container A

Push

Docker
Container
Image
Registry
Search

Run

Build
Dockerfile...

Changes and Updates
Push

App Δ

App
A

Bins/

Bins/
Libs

Docker
Container
Image
Registry

Container
Mod A’

Container
Mo...

Ecosystem Support
•

Operating systems
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OpenStack
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Integrations with Chef, Puppet, Jenkins, Travis, Salt, An...

Use Cases
• Ted Dziuba on the Use of Docker for Continuous Integration at Ebay Now
• https://speakerdeck.com/teddziuba/doc...

Use Cases—From Our Community
Use Case
Clusters

Examples
Building a MongoDB cluster using docker

Link
http://bit.ly/1acbj...

Docker Futures*
• Docker 0.7 (current release)
•
•
•
•

LXC

Docker 0.1-0.6
AUFS

Docker
0.8+

Fedora compatibility
Reduce...

Advanced topics
• Data
•

Today: Externally mounted volumes
•
•

Share volumes between containers
Share volume between a c...

OpenStack / Docker
New hypervisor to enable Nova to deploy Linux containers

Why Docker + OpenStack
• Alternative to VMs within OpenStack-today
• Easier deployment of OpenStack itself-near future
• C...

Why a new hypervisor?
• Nova a computing controller for OpenStack
• Nova support for containers is minimal (via LibVirt)
•...

Want to learn more?
• www.docker.io:
• Documentation
• Getting started: interactive tutorial, installation instructions, g...

www.docker.io