This document discusses using Docker to deploy Python applications. It begins with an overview of Docker and containers versus virtual machines. It then defines a sample Flask Python application and shows how to build a Docker image for it. The document demonstrates running the Docker image locally and deploying it on AWS and GCE. It also discusses the Docker index for sharing images and linking containers.

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Ship Python Apps with Docker!

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Raise your hands if you have...
❖ Tried Docker (online tutorial)
❖ Tried real Docker (e.g. deployed on remote VM)
❖ Installed Docker locally (e.g. with boot2docker)
❖ Written a Dockerfile (and built it!)
❖ An image on Docker hub (pushed or autobuilt)
❖ Deployed Docker images for dev/QA/test/prod… etc.

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About: Rasheed
Full Stack Developer & Co-Founder @ Aurora Solutions -
Provides REMOTE Teams specializing in JVM languages and
Angular + Ember
My team at Aurora specializes in:
► Web/Backend Apps ◄ Java, Groovy, Grails, C# and
AngularJS/EmberJS based single or multi page web apps
► Mobile Apps ◄ Android & iOS
Business domains we specialize in:
¤ Media Streaming
¤ Automated/Algorithmic Trading
¤ Bitcoin / Crypto Currency
LinkedIn: https://se.linkedin.com/in/rasheedwaraich
Email: rasheed@aurorasolutions.io

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Agenda
● Background
● Container vs VM
● Define Sample App
● Build/Run Docker Images
● Docker Index
● Deploy Locally
● Deploy AWS
● Deploy GCE

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Background

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A useful analogy...

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Say again?
❏ Build: package your application in a container
❏ Ship: move that container from a machine to another
❏ Run: execute that container
❏ Any application: anything that runs on Linux
❏ Anywhere: local VM, cloud instance, bare metal…

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Container vs. VM

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Basic Docker Concepts

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Main Docker Parts
● docker daemon
○ used to manage docker (LXC) containers on the host it runs
● docker CLI
○ used to command and communicate with the docker daemon
● docker image index
○ a repository (public or private) for docker images

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Main Docker Elements
● Dockerfiles
○ scripts automating the building process of images
● docker images
○ snapshots of containers or base OS (e.g. Ubuntu) images
● docker containers
○ directories containing everything-your-application

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Install Docker (Ubuntu 14.04)
Step 1: add docker repository key to apt-key for package verification
sudo sh -c "wget -qO- https://get.docker.io/gpg | apt-key add -"
Step 2: add the docker repository to your list of repositories:
sudo sh -c "echo deb http://get.docker.io/ubuntu docker main >
/etc/apt/sources.list.d/docker.list"
Step 3: finally install docker with an apt-get combo:
sudo apt-get update
sudo apt-get install lxc-docker

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Sample python flask app!

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Sample flask app
❏ repo
❏ https://github.com/rasheedamir/flask-sample
❏ flask-sample app structure
❏ app.py
❏ requirements.txt
❏ Dockerfile

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app.py
from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello():
return "Welcome To PyCon Sweden 2015!"
if __name__ == "__main__":
app.run('0.0.0.0')

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requirements.txt
flask

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Install & Run locally!
❏ sudo apt-get install -y python-setuptools
❏ sudo easy_install pip
❏ sudo pip install -r requirements.txt
❏ python app.py
* Running on http://0.0.0.0:5000/

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How to build a Docker Image?
Dockerfile: http://docs.docker.io/reference/builder/

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Dockerfile
FROM ubuntu
# Install Python Setuptools
RUN apt-get install -y python-setuptools
# Install pip
RUN easy_install pip
# Install requirements.txt
ADD requirements.txt /src/requirements.txt
RUN cd /src; pip install -r requirements.txt
# Add the Flask App
ADD . /src
# EXPOSE PORT
EXPOSE 5000
# Run the Flask APP
CMD python src/app.py

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Build an Image
❏ docker build -t <image name> <Dockerfile PATH>
❏ docker build -t pycon-app .
Step 0 : FROM ubuntu
---> 07f8e8c5e660
Step 1 : RUN apt-get install -y python-setuptools
---> Using cache
---> f2a1db95b4b8
Step 2 : RUN easy_install pip
---> Using cache
---> 643c89e6188d
…(ignore)...
Successfully built 403ed7ef1455

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List an Image
❏ docker images

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Run it!
❏ docker run -d -p 5000:5000 pycon-app
❏ -d : detached mode
❏ -p : port forwarding

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List Container(s)
❏ docker ps -a
❏ -a: list stopped containers as well

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Stop/Kill Container(s)
❏ docker kill <CONTAINER ID>

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Remove Container!
❏ docker rm <CONTAINER ID>
❏ removes the container

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Remove Image!
❏ docker rmi <IMAGE ID>
❏ removes the image!

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Deploy Locally!

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Docker Index

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Docker Index
❏ https://index.docker.io/
❏ It’s GitHub for Docker images!
❏ You can pull activemq, mysql, mongodb, hadoop, … etc.
❏ You can hook your docker index repository on to your own repository on GitHub!!!
❏ Build images automatically once you push something to Github

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flask-sample repository
❏ https://registry.hub.docker.com/u/rasheedamir/flask-sample/

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Deploy on EC2!

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Deploy on GCE!

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Docker Linking

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Thank you!
Questions...