Dockerize the world!

Martin Damovský

My plan for today• Introduction to Docker• Some demos• Docker in Cloud• IoT and Docker• News from DockerCon 2015 in SF and Barcelona• Discussion + Beer

Who am I?• Software engineer (java, DBs, continuous integrations, docker, etc.)• Grew up in Orlová - near Ostrava !!!• VŠB TU Ostrava, Tieto Czech s.r.o. Ostrava, Gemalto in Prague• Now in Vendavo CZ in Prague• Twitter @damovsky

Who knows Docker?

What is ?Docker is an open platform for developing, shipping, and running applications. Docker is designed to deliver your applications faster. With Docker you can separate your applications from your infrastructure AND treat your infrastructure like a managed application. Docker helps you ship code faster, test faster, deploy faster, and shorten the cycle between writing code and running code.

What is ?...my version• Docker is new way of virtualization• you virtualize only the app and not the whole OS• + dozen of tools for container sharing, running, orchestrations, etc.• it’s a whole platform for using containers

Docker project• Docker inc. is a sponsor of “Docker” open source project• https://github.com/docker/docker• Written in Go• Main contributors: Docker team, RedHat, IBM, Google, Cisco…• Initial release: 13 March 2013• Operation system: Linux• www.docker.com

Docker vs VM

How does it works?• Use kernel support for isolation (CPU, memory, I/O, network….)• Cgroups – linux kernel feature to limit resource usages• Namespaces – linux kernel feature to isolate services from each other

• Earlier LXC – https://linuxcontainers.org• Now – runC (Libcontainer) https://github.com/opencontainers/runc

Docker Image

Base Image (debian/ubuntu/busybox…)

Image – Added Apache

Docker Container and its file system layers

Base Image (debian/ubuntu/busybox…)

Image – Added Apache

Writable Layer

Docker Container and its file system layers

Base Image (debian/ubuntu/busybox…)

Image – Added Apache

Writable Layer

Image – Added MySQL

Writable Layer

Container #1 Container #2

Docker mottoBuild – build container with your app

Ship - use docker registry to distribute your app

Run - wherever docker runs, your app will run as well

Build – use Dockerfile• Recipe for building the image• Easy to transfer copy&paste• versioning in git, etc..

FROM debian:wheezy

RUN apt-get updateRUN apt-get install -y python2.7

CMD python2.7 -m SimpleHTTPServer 8000

Dockerfile “flow”1. create docker file2. build dockerfile

$ docker build -t myTagName .3. run container

$ docker run -d myTagName

Dockerfile• # Demo

Dockerfile commands• FROM

• RUN

• CMD

• ADD

• USER

• ENV

• etc….see at http://docs.docker.com/reference/builder/

Dockerfile vs layersFROM debian:wheezy

RUN apt-get updateRUN apt-get install -y python2.7

CMD python2.7 -m SimpleHTTPServer 8000

└─61f… Virtual Size: 85.1 MB Tags: debian:wheezy └─5b8.. Virtual Size: 93.4 MB

└─604.. Virtual Size: 123.5 MB└─43e.. Virtual Size: 123.5 MB Tags: python:latest

Docker registry• https://registry.hub.docker.com/• Official repo (trusted builds)• WordPress, MySQL, NgInx, Node, CentOS, Ubuntu, Postgress, mongo, rails,

ruby, java, python, golang, jenkins, php, tomcat, maven, httpd, …

• Public repo with thousands of images• Integration with GitHub• You push the Dockerfile to github• Docker Registry builds the docker image for you

Docker requirements• Technical:• Linux kernel 3.10 +

• Knowledge:• Linux

Docker on Windows / Mac OS

Linux

Docker daemon

Container

Container

Container

Docker client

Mac OS / Windows

VM with Linux

Docker daemon

Container

Container

Container

Docker client

Docker containers are small and fast!Demo #1 – debianDemo #2 - tomcat

Docker API•http://docs.docker.com/engine/reference/api/docker_remote_api_v1.21/•REST API•Live demo – with using curl

Docker itself is….like a java

Without tools and frameworks it’s useless

Docker Toolbox• Docker engine• Kinematic – GUI, runs on MacOS + Windows• Docker Machine – automates Docker environment preparation• Docker Compose – define multi-container application in one file• Docker Swarm – clustering the containers

Where can Docker be helpful?

…when new dev starts configuring project

…it works on my machine!

J2EE Application in Docker - demo• https://github.com/mgreau/docker4dev-tennistour-app

Docker and IoT (Raspberry Pi)• ARM vs x86/64 architecture• Docker to plan official support ARM• HypriotOS – linux distro for Raspberry• Hypriot OS based images: • https://hub.docker.com/u/hypriot/

RPI + Docker• LIVE DEMO – hypriot OS httpd• https://vimeo.com/131966874

DockerCon 2015 Challenge• How many containers could really be started on PI 2?• http://

www.slideshare.net/Docker/docker-online-meetup-27-raspberry-pi-dockercon-challenge

Docker in Cloud• Digital Ocean• UI Tutum.co – worth to try!

• Amazon• Microsoft Azure• Google Cloud

$ Price $• Digital Ocean: $5 / 512 MB, 1 core, 20 GB SSD, 1TB Transfer• Amazon: ?• Microsoft Azure• Google Cloud: free up to 5 nodes, 6+ nodes $0.15 HR/Cluster • Alternative: VSPFree.cz 4GB RAM, 8 cores, 900 Kč /3 Months

Docker and Microsoft ???

Docker and Microsoft ?

Docker and Microsoft ?• Microsoft contributes to docker• see pull request https://github.com/docker/docker/pull/9113

• Microsoft Azure supports docker• Native Docker on Windows Server• Demo ASP.NET in Docker

Docker and PHP ?• Piece of cake ;-)• Live demo

Docker orchestration• Docker Swarm• Kubernetes• Apache Mesos

Run GUI in Docker?• Why not?• https://blog.jessfraz.com/post/docker-containers-on-the-desktop/

Dockercraft• A simple Minecraft Docker client, to visualize and manage Docker

containers.

Live Migration!• https

://blog.docker.com/2015/11/dockercon-eu-2015-container-migration-tool/

What’s in Docker roadmap?• Official ARM support• Docker on Windows Server• Docker on IBM systems, Solaris

Troubles you may face….

….with Docker

Docker Registry - Image Repository• Public – no way for 99,9% apps

• Private• Limitation – money & your internet connection speed

• Local repo - can require some management• Authentication (users/passwords/roles, etc…)• cleaning olds images• disk space• backup (!!!!)

Docker Public Registry and license terms

Unrealistic tutorials and demos• Demos = “wow effect”• Typical problem for production use – database in container • Database container can really be big! (>10 GB or more)• Data should be outside of container and backuped• Virtualization decreases the performance

Run Docker on dedicated machine only• You should use the latest Linux Kernel• Some bug fixes may require you to update Linux Kernel• Who can update Linux kernel in production?

• Which file system to use? BTRFS / AUFS / ?• Which OS ?• Core OS• RancherOS• Well known like a CentOS, Red Hat, Ubuntu ?

• $$$ = MAIN PROBLEM

Many thanks to…• Vendavo CZ for helping me with my presentation!• And for supporting our “after party”

• Tieto CZ for JUG Ostrava organization!• @VitekTajzich for his talk about Yowie

Links:• My demos• https://github.com/damovsky/jug-ostrava-docker

• Yowie – Open source project presented by @VitekTajzich• https://github.com/vendavo/yowie