Building Reusable Development Environments with Docker

Harold DostRaastech, Inc.

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About Me

Harold Dost (@hdost)7+ years of Oracle Middleware experienceOCE (SOA Foundation Practitioner)Oracle ACE AssociateFrom Michiganblog.raastech.com

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About Raastech

» Founded in 2009

» Washington DC area

» Specializes in Oracle Fusion Middleware

» Oracle Platinum Partner

» Oracle SOA Specialized – 1 in 1,500 worldwide

» Oracle Platinum Partner – 1 in 3,000 worldwide

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Docker

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The Docker Ecosystem

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Tools

» Docker Machine

» Docker Engine

» Docker Compose

» Docker Registry

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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

» Microsoft Azure and Hyper-VCC BY 3.0 US, Harold A. Dost III 7

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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Limitations» Linux Kernel Based OS (Ubuntu, CentOS, Arch, Etc.)

» Minimum of Kernel 3.10

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How does Docker work?» Control Groups: Limit Resources of Process Groups

» Kernel Namespaces: Isolates resources

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Definitions» Images

» VM

» Docker

» Container

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Difference between Containers and VMs 2

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

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Dockerfile 1

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

1 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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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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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 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 labelsversion - Show the Docker-Compose version information

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The docker-compose.yml 3

web: build: . links: - db ports: - "8000:8000"db: image: postgres

3 For more information about file arguments check here.

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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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Real world Demo

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Using Docker Machine

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Using Docker Engine

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Running Composed Docker Containers

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Perform Tests

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Questions?

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Contact» Harold Dost

» @hdost

» harold.dost@raastech.com

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