This document discusses Docker and provides an introduction and overview for getting started with Docker. It begins with discussing the challenges of managing complex software stacks across different environments and how Docker addresses this through containerization and separation of concerns. It then covers downloading and installing Docker, basic Docker commands like run, images, ps, and explains a "Hello World" example. Finally, it demonstrates building a simple Whalesay image and running MySQL and WordPress in linked Docker containers using both the Docker CLI and Docker Compose.

2. Suggested Topics
• Composer
• Vagrant
• Kafka
• React / React
Native / Flow
• More Docker
• General JavaScript
• Organization
principals
• Node JS / Node
promises
• GIS
• SQL

3. Topics
• CoffeeScript
• Unit Testing
• Polyfills
• Interaction Design / Improving User
Experience
• Mobile testing
• A/B Testing
• Regression testing
• Performance optimization
• Dev tools
• D3.js / three.js / processing's / etc
• Source Maps
• Static site generators
• Accessibility for Rich Internet
applications (ARIA)
• GeoJSON and mapping API’s
• Electron
• Node.js
• Kalabox
• Server Security
• GreenSocks Animations
• Google Analytics
• Test Driven Development
• Command Line

4. Mark Aplet
@visual28
Web Developer at Symsoft

5. Docker
An Introduction & Getting Started

6. Agenda
• Background
• Installation
• Commands
• Hello World
• Dockerfile
• Docker Compose

7. What’s the Big Deal?

8. LAMP
Once upon a time…

9. The Challenge Today
Static website
nginx 1.5 + modsecurity + openssl + bootstrap
User DB
postgresql + pgv8 + v8
Analytics DB
hadoop + hive + thrift + OpenJDK
Web frontend
Ruby + Rails + sass + Unicorn
Queue
Redis + redis-sentinel
Background workers
Python 3.0 + celery + pyredis + libcurl + ffmpeg +
libopencv + nodejs + phantomjs
API endpoint
Python 2.7 + Flask + pyredis + celery +
psycopg + postgresql-client
Development VM
QA server
Disaster recovery
Contributor’s laptop
Production Servers
Production Cluster
Customer Data Center

10. Matrix From Hell
Static website
Web frontend
Background workers
User DB
Analytics DB
Queue
Development VM QA Server Single Prod Server Onsite Cluster Public Cloud
Contributor’s
laptop
Customer Servers
? ? ? ? ? ? ?
? ? ? ? ? ? ?
? ? ? ? ? ? ?
? ? ? ? ? ? ?
? ? ? ? ? ? ?
? ? ? ? ? ? ?

12. ? ? ? ? ? ? ?
? ? ? ? ? ? ?
? ? ? ? ? ? ?
? ? ? ? ? ? ?
? ? ? ? ? ? ?
? ? ? ? ? ? ?

13. Standardized Container

14. Separation of Concerns

15. Docker Container
Static website Web frontendUser DB Queue Analytics DB
Development
VM
QA server
Public Cloud
Contributor’s
laptop
Production
Cluster
Customer
Data Center

16. Virtualization

17. Virtual
Machines
• Hardware VM’s been
around a long time
• Allows multiple guest
systems to live on a
single host
• Snapshots “freeze”
state at that point
• Can be migrated
from one host to
another

18. VM
Problems
• Ship too many bits
• Each VM contained
independent OS and
resource pool
• Scale may not be of
value

19. Innovation
• Created opportunity to
cut out unnecessary
features to create
lightweight process
virtualization
• lead to creation of
LXC containers. (Linux
Containers)
• Much smaller OS with
minimal resource
requirements that
boots in seconds

21. VM vs Container
Hypervisor (Type 2)
Host OS
Server
Guest
OS
Bins/Lib
s
Docker
VM
Container
App 1
Guest
OS
Bins/Lib
s
App 1
Guest
OS
Bins/Lib
s
App 2
Host OS
Server
App1
App1
App1
App2
App2
App2
App2
Bins/Libs Bins/Libs

22. Enter
Docker
• Removing of the
unnecessary parts of
OS continued
• 2013 DotCloud (now
Docker) really
pushed the
boundaries of
lightweight process
virtualization

23. Enter
Docker
• A Docker container
unlike VM's or LXC
does not require or
include a separate
OS
• Docker instead relies
on the Linux kernel
functionality and
uses resource

24. Get Started

25. Download
• docker.com
• Docker for Mac/Win
for newer systems
• Docker toolbox for
older systems

26. Helpful
• Prior knowledge of
Linux is helpful
• Use Docker CLI in
terminal

27. Commands
COMMANDS
ps = Process
images = images on
host
run = run a command
rm = Remove Process
rmi = remove image
FLAGS
-a = All Hidden
-d = detached mode
-ti = Terminal
Interactive
-p = Port number
-v = Volume

28. DEMO

29. Hello World
$ docker run hello-world

30. Whalesay
$ docker run docker/whalesay cowsay foobar

31. Whalesay: Dockerfile
FROM docker/whalesay:latest
RUN apt-get -y update && apt-get install –y fortunes
CMD /usr/games/fortune -a | cowsay
$ docker build -t docker-whale .

32. MySQL
$ docker pull mysql
$ docker run --name wordpressdb
-e MYSQL_ROOT_PASSWORD=password
-e MYSQL_DATABASE=wordpress -d mysql:5.7

33. WordPress
$ docker pull wordpress
$ docker run
-e WORDPRESS_DB_PASSWORD=password
--name mywordpress
--link wordpressdb:mysql
-p 8080:80 -d
-v "$PWD/":/var/www/html wordpress

34. WordPress: Docker-Compose
version: '2'
services:
db:
image: mysql:5.7
volumes:
- "./.data/db:/var/lib/mysql"
restart: always
environment:
MYSQL_ROOT_PASSWORD: wordpress
MYSQL_DATABASE: wordpress
MYSQL_USER: wordpress
MYSQL_PASSWORD: wordpress
wordpress:
depends_on:
- db
image: wordpress:latest
links:
- db
ports:
- "8080:80"
restart: always
environment:
WORDPRESS_DB_HOST: db:3306
WORDPRESS_DB_PASSWORD: wordpress
volumes:
- ./wp-content/:/var/www/html/wp-content