boot2docker: Zero to Docker in 20s

What started as a hack has turned into a real operating system, used by tens of thousands of developers worldwide. And it all started because we found that having a full featured host operating system isn't needed to run Docker images.

boot2docker is essentially trying to change the way people develop, run and deploy software through Docker, across all OSes and hardware. It is opinionated, is distributed as an ISO image, and is read-only.

In this talk, I will not only present you what boot2docker is, but what we stand for, and why we think our choices change the way we deal with OS and how Docker is paving the way to the next generation of software.

Transcript

1. BOOT2DOCKER Zero to Docker in 20s Steeve Morin
 @steeve
2. ‘SUP • @steeve • independent, always for hire • <LANGUAGE>-ista • wingsuiter (because fuck yeah)
4. –Every developer ever “Works on my machine.”
6. It’s a pretty big problem.
7. THE MATRIX FROM HELL My Machine Your Machine QA Staging Prod Web App ? ? ? ? ? Backoffice ? ? ? ? ? Queue ? ? ? ? ? Workers ? ? ? ? ? DB ? ? ? ? ?
8. THE MATRIX FROM HELL ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
9. THE SHIPPING CONTAINER
10. WHY IT WORKS • Separation of concerns • Goods are packed as containers • Shipping companies only care about shipping containers • Everything built around containers
11. THE MATRIX FROM HELL
12. LINUX CONTAINERS • Since Linux 3.0 • But only use from 3.8 • Shared kernel • Isolated processes • Startup is fast (100ms fast) • Very light
13. DOCKER IS CONTAINERS FOR SOFTWARE • Lightweight virtualization • Leverages Linux Containers • No performance hit (unlike VMs *wink wink*) • Devs supply docker images • Ops deploy and run docker images
14. THE MATRIX FROM HELL My Machine Your Machine QA Staging Prod Web App Backoffice Queue Workers DB
15. FOR DEVS • My code • My libraries • My dependencies • My linux distribution • My data
16. FOR OPS • Logging • Network access • Monitoring • Permissions, throttling • CPU, RAM, DISK
17. WORKFLOW • git like (commit, tag, push, pull) • Run image in container • Modify container as needed • Commit container as new image • Tag complete image • Push image when ready
18. YOUR FIRST CONTAINER $ docker run -i -t ubuntu bash /# apt-get -y update /# apt-get install -y python /# wget http://srv/myapp.zip /# unzip myapp.zip $ docker commit <container_id> myapp $ docker tag myapp steeve/myapp $ docker push steeve/myapp
19. THE DOCKERFILE • A standard way to build Docker images • Very simple syntax and limited scope • It’s simply run/commit ! • The whole environment in one file
20. THE DOCKERFILE $ cat Dockerfile FROM ubuntu ! RUN apt-get -y update RUN apt-get install -y python ! ADD myapp / ! EXPOSE 8080 CMD ["python", “/myapp/app.py"] $ docker build -t steeve/myapp $ docker run steeve/myapp
21. THE DOCKER REGISTRY • Repository of public Docker images • http://index.docker.io • docker push to the registry • Can run registry locally • Registry is simply a Docker image!
22. BOOT2DOCKER
23. –Steeve Morin “When you think about it, the host system is redundant to the Docker image… Right?”
24. TINY CORE LINUX • 9mb ISO (!) • Runs from RAM • Boots in 3s • v4.7 at the time • Binary repository • Pretty big community
25. DOCKER ON TCL • First try, July 2013 • Linux Kernel 3.0 x86 without AUFS? • Custom Linux 3.10 with AUFS • Missing critical packages? • Cross compilation FTW • docker version works!!!
26. DOCKER ON TCL $ docker run -i -t busybox /bin/sh
 lxc-start: Invalid argument - pivot_root syscall failed
27. DOCKER ON TCL: PART DEUX • December 3rd, 2013 • Docker Global Hack Day • Better custom Kernel • 3.10/AUFS/CGROUPS… • Custom LXC patch
28. DOCKER ON TCL $ docker run -i -t busybox /bin/sh
 #/
29. • Based on Tiny Core Linux 5.1 • 25mb ISO, boots in 5-10s • Runs from RAM, read-only • updates are easy • Disk persistance • Built with Docker • Yes, boot2docker builds with boot2docker
31. 100 000 downloads
32. $ boot2docker-cli init $ boot2docker-cli up $ export DOCKER_HOST=localhost $ docker run -i -t busybox sh #/ boot2docker + Docker OSX client = <3
36. THANK YOU github.com/boot2docker/boot2docker @steeve