Building Reusable Development Environments with Docker

Harold DostRaastech, Inc.

CC BY 3.0 US, Harold A. Dost III 1

About the Speaker

Work For Raastech, Inc. - Virginia/DC Area 1

1 Image source: https://upload.wikimedia.org/wikipedia/commons/d/d2/USNavy030926-F-2828D-307AerialviewoftheWashingtonMonument.jpg

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Live in Michigan2

• Detroit Metro Area

2 Images Source: Wikipedia

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Core Java

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Shameless Plug

• For SOA Administration

• Buy From Packt Website

• Promo Code for 50% off: UKOUG50

• Valid until Dec 15, 2016

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Lately

• Primarily working as Lead QA for Client creating IoT devices

• Part of the Release team

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Typical Steps1.Setup Database

2.Create Schemas

3.Setup Server

4.Deploy Application

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Basic Java App[Kinda] Demo

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Code Quality 3

3 Image Source: http://xkcd.com/1695/

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Consistency 4

• Vagrant

• Chef

• Puppet

• Ansible

4 Image Source: https://www.flickr.com/photos/cadsonline/889810973

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DockerCC BY 3.0 US, Harold A. Dost III 11

DockerEcosystemCC BY 3.0 US, Harold A. Dost III 12

Tools

• Docker Machine

• Docker Engine

• Docker Registry

• Docker Compose

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Using Docker Machine

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Docker Machine• This aids in creating docker hosts

• The target of these can be:

• Cloud Providers

• AWS

• Digital Ocean

• Google Cloud Platform

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Docker Machine cont.• Other VM Targets

• OpenStack

• Oracle VirtualBox

• VMware Fusion®

• vCloud® Air™

• vSphere®

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Docker MachineCreates a dummy machine

docker-machine create --driver virtualbox default

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Docker Engine

• Basis of Eco-system

• Mediate between containers and host

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Benefits

• Lightweight

• Walled off from other process

• Repeatable

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Definitions• Images

• VM

• Docker

• Container

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How does Docker work?

• LXC -> libcontainer5

• Control Groups: Limit Resources of Process Groups

• Kernel Namespaces: Isolates resources

5 http://www.zdnet.com/article/docker-libcontainer-unifies-linux-container-powers/

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Difference between Containers and VMs 6

6 Image Source: http://www.docker.com/what-docker

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Limitations - Linux• Linux Kernel Based OS (Ubuntu, CentOS, Arch,

Etc.)

• Minimum of Kernel 3.10

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Limitations - Windows Host

• Microsoft Windows Server 2016

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Windows Specific Containers• Windows Server Containers

• Hyper-V Containers

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Dockerfile 7

FROM java:8RUN apt-get updateRUN apt-get install -y maven nodejsEXPOSE 9000WORKDIR /appCOPY app /appRUN chown -R appuser /appUSER appuserENTRYPOINT mvn spring-boot:run

7 For more information about the Dockerfile format check here.

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Using Docker Engine• 39 Different commands

• Only covering some of the most used

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Commands: Retrievepull - Pull an image or a repository from a registry

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Commands: Create and Deletecreate - Create a new containerrm - Remove one or more containersrmi - Remove one or more images

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Demo Commands

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Commands: Start and Stopstart - Start 1+ stopped containersstop - Stop a running containerexec - Run command in running containerrun - Run command in new containerkill - Kill a running containerrestart - Restart a running container

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Windows Caveat• To enable hyper-v at runtime --isolation=hyperv

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MAVEN Plugins• https://github.com/spotify/docker-maven-plugin

• https://github.com/rhuss/docker-maven-plugin

• https://github.com/wouterd/docker-maven-plugin

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Quick Maven Demo

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Commands: Organizerename - Rename a containertag - Tag an image into a repositorycommit - Create a new image from a container's changes

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Commands: Etc.cp - Copy files to and from containersport - List port mappingsps - List containersattach - Attach to a running container

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Docker Registry• Place to Store your images

• Can run in a container also

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Docker Compose• Create Multi-container Applications

• Example:

• Java App

• Database

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Docker Compose• Uses decriptor file compose.yml

• Brings up an application

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Docker Compose Commandsbuild - Build or rebuild serviceskill - Kill containersup - Create and start containersmigrate-to-labels - Recreate containers to add labels

version - Show the Docker-Compose version information

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The docker-compose.yml 8

web:

build: .

links:

- db

ports:

- "8000:8000"

db:

image: postgres

8 For more information about file arguments check here.

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Demo docker-compose

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Docker on Windows• https://msdn.microsoft.com/en-us/

virtualization/windowscontainers/deployment/docker_windows

Resources• https://msdn.microsoft.com/en-us/

virtualization/windowscontainers/deployment/

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Project 9

• https://github.com/hdost/docker-presentation

9 Image Source: http://xkcd.com/1597/

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Questions?

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Contact• Harold Dost

• @hdost

• harold.dost@raastech.com

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