What is Docker?

Docker is an open-source project to easily create lightweight, portable, self-sufficient containers from any application

Source: docker.io

What is a Container?

• Group of processes contained in a Isolated Environment
• Isolation provided by Concepts like cgroups and namespaces

BUILD SHIP & RUN
ANY APP, ANYWHERE

Brief comparison

Hypervisor vs Docker Container

Dockerfile

FROM        ubuntu
MAINTAINER  John Doe (john@doe.com)

LABEL Description="start the foobar executable" 

# Apt update
RUN apt-get update
RUN apt-get install -y inotify-tools 

# Install Nginx and OpenSSH
RUN nginx openssh-server
RUN bash -c "./somescript.sh"

# Install Nodejs, bla bla ....
						

FROM        node:510
MAINTAINER  John Doe (John Doe@doe.com)

# replace this with your application's default port
EXPOSE 8888
						

$ docker build -t nodejs-app .
$ docker run -it --rm --name ahihi nodejs-app
						

Docker on Cloud

Who use?

Slide: Docker Ecosystem on Azure

Slide: Running Docker with OpenStack