NLUUG 2014: Zero to Docker in 20s

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 debian:jessie ! 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 (5.3 now) • 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
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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
30. 0.9.1 (just released)
32. 130 000 downloads
33. $ boot2docker-cli init $ boot2docker-cli up $ export DOCKER_HOST=localhost $ docker run -i -t busybox sh #/ boot2docker-cli + boot2docker OS + Docker OSX client = <3
37. THANK YOU github.com/boot2docker/boot2docker @steeve