Django & Docker - Speaker Deck

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Django & Docker How to be happy with Django & Docker

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Hi there ! My name is Christian @christianbarra

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Quick survey • How many people have heard about docker ? • How many people have tried docker ? • How many people are using docker ?

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Let’s go !

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! it’s all heavily under construction !

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The (big) problem

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Deployment sucks !

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Our Noah’s ark (from Tokyo Docker Meetup)

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What is Docker ?

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Definition Docker is an open-source platform for developing, shipping, and running applications. Is fast, lightweight and portable and you can separate your applications from your infrastructure. Docker combining a lightweight container virtualization platform with workflows and tooling that help you manage and deploy your applications.

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Docker is not a VM

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The little story • Dotcloud inc. (PaaS) -> Docker inc. • Initially written in python -> now in GO • 1.0 is out ! • Initially based on LinuX Container (LXC) now it uses libcontainer

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How it works 3 main components: ! • Docker server daemon • Docker API/client (CLI - command line interface) • Docker registry (official, private and public) ! The Docker API/client and Docker server communicate via sockets or through a RESTful API.

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Why use Docker ?

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Well…. Docker is: • Lightweight • Minimal resources -> Minimal overhead • Fast • Portable • Open Source • Easy

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How to install Docker

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Requirements • 64bit • LXC (not anymore with libcontainer) • AUFS • Linux 3.8 or above ! Available for : Linux, Mac OS X (with boot2docker), soon for other Unix OS.

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$ sudo apt-get update $ sudo apt-get install linux-image- extra-`uname -r` --------------------- $ curl -s https://get.docker.io/ ubuntu/ | sudo sh ! ! ! Other OS at: http://docs.docker.com/

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Docker components

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Docker server • The Docker daemon runs on a host machine. • It can be LOCAL or REMOTE • He managed CONTAINERS and IMAGE • The user does not directly interact with the daemon, but instead through the Docker API/client.

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Docker API/client • Is the primary user interface to Docker • It accepts commands from the user and communicates back and forth with a Docker daemon.

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Docker registry It’s simple the Docker images repository ! It can be: • Official: hub.docker.com (private and public) • Others (private and public) ! ! docker-registry repository https://github.com/dotcloud/docker-registry

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Now our best friends IMAGE & CONTAINER

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Docker image A Docker image is a read-only “template”. ! For example, an image could contain an Ubuntu operating system with Apache, NGINX or your database. ! Images are used to create Docker containers. ! You can: • build new images • update existing images • download Docker images already created.

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Docker container 1/2 Docker containers are similar to a directory. ! A Docker container holds everything that is needed for an application to run and can be run, started, stopped, moved, and deleted. ! Each container is an isolated and secure application platform. ! A container consists of an operating system, user-added files, and meta-data.

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Docker container 2/2 An image tells Docker what the container holds, what process to run when the container is launched, and a variety of other configuration data. ! When Docker runs a container from an image, it adds a read-write layer on top of the image (using a union file system) in which your application can then run.

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Docker flow 1.Build/Download your Docker images 2.Create (alias run) your container from those images 3.Share/Save your images on Docker Hub or your own repository

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Docker CLI alias Docker Command Line Interface

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docker [OPTIONS] COMMAND [arg] docker.io in ubuntu 14.04

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Some commands docker run # run a container docker stop # stop a container docker rm # remove a container docker rmi # remove an image docker inspect # information about container docker commit # create a new image from the container docker logs # container’s logs docker build # build a container from a dockerfile docker ps # lists the container docker pull # pull an image from a registry

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docker run [OPTIONS] IMAGE[:TAG] [COMMAND] [ARG] Run a command in a new container starting from an image

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Example #1 docker run

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docker run ubuntu echo “ciao” run a container based on ubuntu image with command echo “ciao” ! root@test:~# docker run ubuntu echo "ciao" Unable to find image 'ubuntu' locally # looks for ubuntu image locally Pulling repository ubuntu # pull ubuntu image from hub.docker.com a7cf8ae4e998: Download complete …………………………………………………… 4d26dd3ebc1c: Download complete d4010efcfd86: Download complete ciao # output of our COMMAND

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Some run options -d # Detached mode (alias background) -e # Set environment variables -h # Container host name -p # Publish a container's port to the host -v, --volume=[] #Bind mount a volume --link #Add link to another container (name:alias) --volumes-from=[] #Mount volumes from the specified container(s) -m, --memory=”” #Memory limit -c #CPU shares (relative weight)

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Example #2 docker run

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docker run -v /var/log -p 80:80 --name nginx_c ubuntu touch /var/log/text -v /var/log # mount dir outside container -p 80:80 # redirect 80 port of host machine to 80 port of container --name nginx_c # name this container nginx_c touch /var/log/text # our COMMAND with [ARG]

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docker inspect CONTAINER|IMAGE [CONTAINER|IMAGE] Return information on a container/image

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docker logs [OPTIONS] CONTAINER Fetch the logs of a container

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docker ps [OPTIONS] List containers

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docker build [OPTIONS] PATH | URL | - Build an image from a Dockerfile

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Docker CLI reference http://docs.docker.com/reference/commandline/cli/

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Dockerfiles alias how to automate building of images

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This is a Dockerfile FROM ubuntu:12.04 # sets the base image RUN apt-get update # run a command RUN apt-get install -y build-essential git python / python-dev python-setuptools python-pip ADD ./ /app # copy files from host machine to images RUN pip install -r /app/requirements.txt VOLUME /app # In this way you can see this dir from your host machine EXPOSE 8080 # Port to expose CMD ["/usr/local/bin/uwsgi" ,"--ini" ,"/app/conf/uwsgi.ini"] # default command that will run when container starts

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But remember…. Every RUN is a commit that save the state of the container into an image ! RUN cd /var/log RUN rm mylogs ! is different from ! RUN cd /var/log && rm mylogs

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Dockerfile cache Every line in your Dockerfile is chached, if you change one line Docker will build your image from that line.

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Dockerfile docs reference http://docs.docker.com/reference/builder/

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What sucks (for me) Manage many containers alias orchestration

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Interesting projects • Dokku - Heroku with Docker • Orchard - PaaS provider for Docker • CoreOS - OS for Docker cloud server • Maestro - Orchestration system for Docker • Apache Mesos - From the name it seems awesome • Flynn.io - PaaS provider for Docker • Deis.io - PaaS provider for Docker • Other - A lot of other interesting stuff

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Resources to start Learn Docker in 10 min http://www.docker.com/tryit/ ! How is Docker.io different from a normal VM ? http://stackoverflow.com/questions/16047306/how-is-docker-io- different-from-a-normal-virtual-machine ! Can you explain Docker with a practical example/case ? http://stackoverflow.com/questions/20618828/can-you-explain-docker- with-a-practical-example-case ! Docker Explained: How To Containerize Python Web Applications https://www.digitalocean.com/community/tutorials/docker-explained-how- to-containerize-python-web-applications ! !

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Community ! official web site: www.docker.com irc: #docker on freenode google groups: docker-user italian meetup: (?)

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THANK YOU ! @christianbarra www.chrisbarra.me slide: http://goo.gl/BihxmD