Introduction to DockerWilly Kuo

Feb 25, 2013

About Me• About me

• Work at numerinfo.com

• Organizor of http://www.meetup.com/Docker-Taipei/

• https://github.com/waitingkuo

• waitinguo0527@gmail.com

The Challenge

The Matrix From Hell

Cargo Transport Pre-1960

The Matrix From Hell

Solution: Intermodal Shipping Container

Docker is a shipping container system for code

Docker eliminates the matrix from hell

Deploy to almost anywhere

OK Soon Soon ?

VMs vs Containers

VMs vs Containers

Installation• Natively (Linux)

http://docs.docker.io/en/latest/installation/#installation-list

• Boot2Docker (Linux, OSX)https://github.com/boot2docker/boot2docker

• Vagrant https://github.com/waitingkuo/docker-vagrant

Play Docker via Vagrant• Install vagrant & virtualbox

• $ git clone https://github.com/waitingkuo/docker-vagrant.git$ cd docker-vagrant$ vagrant up$ vagrant ssh

• Start to play docker

Download a pre-built image

• $ docker pull ubuntu

• You can find more images here https://index.docker.io/

Docker Images?

• $ docker images

Run Something…

• $ docker run ubuntu echo hi

• $ docker run ubuntu uname -a

• $ docker run ubuntu ifconfig

How about running bash?

• $ docker run ubuntu bash

• oops

• $ docker run -i -t ubuntu bash

Let’s install something

• $ docker run ubuntu apt-get install -y python-pip

• Try to install something via pip

• $ docker run ubuntu pip install bottle

• Where’s my pip?

docker ps• $ docker ps

• Nothing …

• $ docker -a

• Too much …

• $ docker ps -l

• That’s it

Think about Git

• Coding…

• $ git add -A

• $ git commit -m ‘xxx’

Commit!!?

• $ docker commit <container-id> mypip

• Now, you have a new image called mypip

• $ docker images

Finally, you can use pip

• $ docker run mypip pip install bottle

• $ docker commit <container-id> mybottle

Time to run a web server

• Run a simple website using bottle framework

• https://github.com/waitingkuo/bottle-sample

Clone our project!

• First, we need git

• $ docker run mybottle apt-get install git-core

• uuuh… Seems we need to do apt-get update

Apt-get update and install again

• $ docker run mybottle apt-get update

• $ docker commit <container-id> myupdate

• $ docker run myupdate apt-get install git-core

• $ docker commit <container-id> mygit

Clone our project part 2

• $ docker run mygit git clone https://github.com/waitingkuo/bottle-sample.git

• docker commit <container-id> myweb

Bottle Rock

• $ docker run myweb python bottle-sample/app.py

• htttp://192.168.66.66:8080 (192.168.66.66 is the ip for the virtual machine we create by vagrant)

• What the fuckrock??

Port forwarding

• $ docker run -p 9999:8080 myweb python bottle-sample/app.py

Daemonize?

• $ docker run -p 9999:8080 myweb python bottle-sample/app.py

• Now, our web server is running in the background

• $ docker ps

Can we kill it?

• just like the kill command, except that we should assign the container id instead of pid

• $ docker kill <container-id>

Dockerfile

• Tutorial: https://www.docker.io/learn/dockerfile/

Example• DockerfileFROM ubuntu RUN apt-get update RUN apt-get install -y git-core RUN apt-get install -y python-pip RUN pip install bottle RUN git clone https://github.com/waitingkuo/bottle-sample.git CMD python bottle-sample/app.py

Build image by Dockerfile

• $ docker built -t myweb-2 . # don’t forget the .

• Now, you have a new image, myweb-2

• $ docker image

• $ docker run -p 9999:8080 myweb-2 python bottle-sample/app.py

Think about GitHub

• We have already had docker commit

• Can I push my image to something like GitHub?

Docker Index

• https://index.docker.io/

• The place to find Docker container images

• Can automatically create Docker Image from your project on Github, and keep them in sync

The basics of the Docker System

Changes & Updates

Example - Deploy Mongodb

• https://index.docker.io/u/waitingkuo/mongodb/

• The Dockfile is hosted on Github https://github.com/waitingkuo/dockerfiles/blob/master/dockerfiles/mongodb/Dockerfile

• $ docker run -d -p 27017:27017 -p 28017:28017 waitingkuo/mongodb

• Mongodb is runninghttp://192.168.66.66:28017/

Ecosystem - WebUI

• dockeruihttps://github.com/crosbymichael/dockerui

• Shipyardhttps://github.com/shipyard/shipyard

Ecosystem - PaaS

• deishttps://github.com/opdemand/deis

• dokkuhttps://github.com/progrium/dokku

• flynnhttps://flynn.io/

Ecosystem - CI

• dronehttps://github.com/drone/drone

• StriderCDhttp://stridercd.com/

Thank you!