docker for the brave

DOCKER FOR THE BRAVEINTRODUCTION FOR BUSY PEOPLE

AGENDA

AGENDA

▸ The need for containers

▸ Overview: Docker and the Docker Ecosystem

▸ Basic Docker Workflows

“Well, it worked on my machine!”

THE NEED FOR CONTAINERS

TRADITIONAL SOFTWARE DELIVERY SUFFERS FROM GAP BETWEEN DEV AND PROD

STABILITY AND ROBUSTNESSFLEXIBILITY

Development Production


TRADITIONAL SOFTWARE DELIVERY SUFFERS FROM GAP BETWEEN DEV AND PROD

Loan Application

JDK 8

WILDFLY

MYSQL

MAC OSX

Production

JDK 6

WEBLOGIC

ORACLE

AIX

FIREWALL

SECURITY INFRASTRUCTURE

MONITORING

…

?

Magic Operations Guide Template

Unicorns do not exist!


CONTAINERIZED APPLICATIONS OFFER A WAY TO NARROW THE GAP

▸ Immutable containers reduce human errors

▸ Instead of “works on my machine” you deploy the machine

▸ Think diapers


PACKAGE ONCE DEPLOY ANYWHERE

CODE

RUNTIME SYSTEM TOOLS

LIBRARIES

Container


Loan Application

JDK 7

MYSQL CORE OS

WILDFLY

Container Production

Sales Application

JDK 8

NEO4J ALPINE

JETTY

Container

JDK 7

MYSQL CORE OS

WILDFLY

Container

JDK 8

NEO4J ALPINE

JETTY

Container


VIRTUALIZATION VS. CONTAINERS

SPEED FOOTPRINT SIMPLICITY

DOCKER BOOTCAMP

OVERVIEW: DOCKER AND THE DOCKER ECOSYSTEM

THE DOCKER ECOSYSTEM CONSISTS OF FIVE ESSENTIAL PARTS

Docker

SwarmMachine

Compose Network


WE’LL ONLY COVER THE BASICS

Docker

Machine

Compose

Swarm

Network

LINUX VM (BOOT2DOCKER.ISO)


DOCKER-MACHINE HELPS GETTING STARTED ON NON LINUX BOXES

DOCKER HOST

WILDFLY

MYSQL

REDIS


DOCKER TOOLBOX TO THE RESCUE

▸ Offers a one stop Docker setup for non-Linux machines

▸ Easiest way to get started on Mac and Windows

▸ Includes everything covered in theses slides

https://www.docker.com/docker-toolbox

https://www.docker.com/docker-toolbox


DOCKER IN A NUTSHELL

REGISTRYDOCKER HOST

DOCKER CLIENT

CONTAINER

CONTAINER

CONTAINER

IMAGE

IMAGE


IMAGES AND CONTAINERS

IMAGE ALPINE:3.1

CONTAINER: DREAMY_HUGLE B00F46831AF3

CONTAINER: SLEEPY_GOLICK F0A1172ADB12

CONTAINER: JOLLY_BABBAGE D0BAE89AD214


CONTAINER LIFECYCLE

CREATED

STARTED

STOPPED

REMOVED

DEMO TIME

BUILDING A LOCAL TWITTER

▸ Bootstrap demo

▸ Basic container usage


EXPOSING SERVICES


CONTAINER PORTS ARE NOT VISIBLE OUTSIDE OF THE DOCKER HOST


CONTAINER PORTS ARE NOT VISIBLE OUTSIDE OF THE DOCKER HOST

?DOCKER HOST


80

443


CONTAINER PORTS MUST BE MAPPED TO EXTERNALLY VISIBLE PORTS


CONTAINER PORTS MUST BE MAPPED TO EXTERNALLY VISIBLE PORTS

DOCKER HOST


80

443

8080

DEMO TIME


▸ Bootstrap demo


▸ Running ngnix

▸ Exposing ports


THE CONTAINER FILESYSTEM IS VERSIONED

CONTAINER: TEST F0A1172ADB12

CREATED

STARTED




foo

CREATED

STARTED




foo

STARTED

STOPPED


THE CONTAINER FILESYSTEM SURVIVES RESTARTS


foo

STARTED

STOPPED


THE CONTAINER FILESYSTEM SURVIVES RESTARTS


foo

STARTED




foo

CREATED

STARTED

STOPPED

REMOVED


THE CONTAINER FILESYSTEM IS TRANSIENT


foo

STOPPED

REMOVED


THE CONTAINER FILESYSTEM IS TRANSIENT

CONTAINER: TEST D8C89E9BB6AB

CREATED

STARTED


THE CONTAINER FILESYSTEM IS SEPARATED FROM THE HOST ENVIRONMENTHOST



PERSISTENT VOLUMES ARE USED TO SHARE DATA BETWEEN HOST AND CONTAINER

HOST



VOLUME: DATA


PERSISTENT VOLUMES ARE USED TO SHARE DATA BETWEEN HOST AND CONTAINER

HOST

CONTAINER: MYWEB B00F46831AF3

VOLUME: ~/SHARED

VOLUME: /USR/SHARE/NGINX/HTML/

foo.htmlfoo.html

DEMO TIME


▸ Bootstrap demo


▸ Running ngnix

▸ Exposing ports

▸ Sharing volumes and data

▸ Monitoring


THE DOCKERFILE IS THE RECIPE FOR AN IMAGE

IMAGE KOENIGHOTZE/JDK8

Dockerfile


READ WRITE LAYER

READ LAYER

READ LAYER

READ LAYER


IMAGES ARE LAYERED; EACH LAYER IS CACHED OR FETCHED INDIVIDUALLY

KOENIGHOTZE/JDK8

FROM GLIDERLABS/ALPINE:3.3

…

CMD ["BASH", "-L"]

MAINTAINER DAVID SCHMITZ

VOLUME [$SRC_VOLUME]

COMPLEX SCENARIOS USING COMPOSE

COMPOSITION


MANAGING DEPENDENCIES WITH DOCKER-COMPOSE



CONTAINER: JOLLY_BABBAGE D0BAE89AD214


USING DOCKER-COMPOSE FOR DEPENDENCIES*

BOOKING

ping mongodb

MONGODB GUEST

curl $GUEST_URI

*Note: Compose V1 Syntax

MOVIE CONTAINER


DOCKER SINGLE HOST NETWORKING USING LINKS

MOVIE.WAR

ACTOR CONTAINER

ACTOR.WAR

DEMO TIME

CREATING A SIMPLE COMPOSITION WITH SPRING-BOOT AND DOCKER

▸ Create simple web application

▸ Add database as container

▸ Create compositions file

▸ Add volumes

BEYOND DOCKER

WHAT IS NEXT?

▸ CoreOs and rkt

▸ Docker Swarm and Kubernetes

▸ Unikernels (!)

BEYOND DOCKER AND SUMMARY

SUMMARY

▸ Docker is production ready

▸ Docker-Compose is targeted towards developers and should not be used for production

▸ Might have some issues with regards to networking and clustering

▸ Multi-Cloud deployments possible

▸ Community is vital and eager to help

WANT TO KNOW MORE?

TRY ONE OF THESE GREAT VAULTS OF WISDOM

▸ Docker Home Page: https://www.docker.com/

▸ Docker Cheat Sheet: https://github.com/wsargent/docker-cheat-sheet

▸ James Turnbull, Dockerbook: http//www.dockerbook.com/

https://github.com/wsargent/docker-cheat-sheet

THANK YOU!<[email protected]>

mailto:[email protected]?subject=

BACKUP<>


Loan Application

JDK 7

MYSQL CORE OS

WILDFLY

Container

JDK 8

NEO4J ALPINE

JETTY

Container

RUBY

POSTGRES ALPINE

RAILS

Container

…

… …

…

Container

docker for the brave

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