Docker: The basics

Marcelo CostaCloud Integration Engineer, Connections Cloud

May 2016

Including a demo with an awesome full-stack JS app

Agenda

What is Docker?

What is Jquery, MongoDB and Nashorn?

The high-level architecture of the Online Kanban Board

Docker run syntax / putting everything together

What is Docker-Compose and why it is so amazing

DEMO

Q & A

What is Docker?

What is Jquery, MongoDB and Nashorn?

Must mention: avatar.js

The high-level architecture of the Online Kanban Board

Docker run syntax / putting everything together 1/2

The basics:docker run -it busybox:latest

docker run -d busybox:latest topc646318a53cd4e16780cd654fa6df854c6550e089491f4a805ba16edd3b94c32

docker attach c646

ctrl+c stops the container (ssh if you need to jump into containers without impacting them)

Some important parameters:

ParametersConfiguration

-d (detached)Runs in detached mode (not interactive)

--nameName of the container (ID)

-h (Hostname)Hostname within Docker Network

--linkAllow communication within Docker Network

-p (Port)Exposed port (host:container)

-v (Volume)Mapped Volume/disk/path (host:container)

Name of the image (parent obj of the container)

-w (Working Dir)Initial directory/folder for container commands

Docker run syntax / putting everything together 2/2

Adding some complexity:

docker run -d --name mydbcontainer -h mykanbandbhost -p 27017:27017 -v /home/marcelo/.docker-volumes/myOnlineKanban/data:/data/db mongo

docker run -d --name mykanban -h mykanbanapp --link mydbcontainer -p 8080:8080 -w /opt/mykanban -v /home/marcelo/Projects/MyOnlineKanban/mykanban:/opt/mykanban java:8 /usr/bin/jjs -cp lib/mongo-2.10.1.jar httpsrv.js

Listing running containers:docker ps --filter status=runningCONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES4c97e0fca863 busybox:latest "top" 3 seconds ago Up 2 seconds stupefied_euclid

What is Docker-Compose and why it is so amazing

Instead of executing multiple docker run commands or opening multiple terminals to start and track each container configuration, use a single command:

Docker-compose up

Docker-compose.yml

mykanban: image: java:8 working_dir: /opt/mykanban/ command: jjs -cp lib/mongo-2.10.1.jar httpsrv.js links: - mydbcontainer ports: - '8080:8080' volumes: - ~/Projects/MyOnlineKanban/mykanban:/opt/mykanban

mydbcontainer: image: mongo environment: MONGODB_USER: mongouser MONGODB_PASSWORD: meh123 hostname: mykanbandbhost ports: - '27017:27017' volumes: - ~/.docker-volumes/myOnlineKanban/data:/data/db/

DEMO

Q & A

2014 IBM Corporation

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2014 IBM Corporation