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Ruby and Docker on Rails
This document summarizes Muriel Salvan's presentation on Docker and cargo transport. It discusses how Docker can be used to containerize applications and services, create images from Dockerfiles, run containers from images, and deploy images to registries for sharing. Examples are given on building Ruby and Rails images, running a clustered Rails application in containers, and using a proxy container to load balance requests. Performance benefits of Docker are highlighted such as faster launch times and consistent memory usage across containers.
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Ruby and Docker on Rails
- 1. Ruby and Muriel Salvan X-AeonSolutions Feb 04th 2014 Riviera.rb on Rails
- 2.
- 3. Muriel Salvan Freelance Developer Founderof X-Aeon Solutions Open Source advocate Ruby / Rails expert Co-founder of RivieraRB
- 4.
- 5. Let's talk aboutcargo transport (that's why you came here, right?)
- 6. "I want mypiano to be delivered from Nice to London"
- 7. "I also wantmy barrel of wine delivered from Nice to London."
- 8. "Hey! Don't forgetmy bags of rice too!"
- 9.
- 10. "By train, plane,boat, truck, bus, mule, or whatever!"
- 11. Do I worryabout how goods interact (e.g. coffee beans next to spices) Can I transport quickly and smoothly (e.g. from boat to train to truck)
- 13. A standard containerthat is loaded with virtually any goods, and stays sealed until it reaches final delivery. …in between, can be loaded and unloaded, stacked, transported efficiently over long distances, and transferred from one mode of transport to another
- 15. Static website Do servicesand apps User DB Queue interact appropriately? Web frontend Background workers Development VM Analytics DB API endpoint Production Cluster Public Cloud QA Can I migrate smoothly and server Disaster recovery Contributor’s laptop quickly? Customer Data Center Production Servers
- 16. Static website User DB Queue AnalyticsDB Background workers API endpoint Web frontend Production Cluster QA server Customer Data Center Development VM Disaster recovery Production Servers Contributor’s laptop Public Cloud
- 17. So what doesDocker bring?
- 18. 1- File systemsimages Structured in layers (storing diffs only) ● Layers are reused between images ● Clever!
- 19. 2- Processes runin a contained environment (containers) It's chroot on steroids! Using images' file systems (isolated like in chroot) ● In a separate process space (using Linux containers) ● With a specific network interface ● Can run as root ●
- 20. 3- A publicrepository of images Pull and push images ● Build them from Github projects ● Be part of a great community! ●
- 21. "Is it ayet-another-virtualizationsolution?"
- 22.
- 23. Processes run byDocker share the host Kernel ● No device emulation ● No boot sequence ● Architectures and platforms between Host and containers must match ●
- 24. "So where isthe portability?"
- 25. ● Containers can berun on any Kernel (>= 3.8, Linux 64b only for now) Whatever the Linux distro ● If it runs on the Host, it can run from a container ● Physical, virtual, cloud... ●
- 26. It's blazingly fast!!! Afew ms to load the container and run the command
- 27.
- 28. Get running clusterson a single host Awesome to test them!
- 29. Ensure the environmentyour process runs in is the same in dev, test and prod Bring your environment along with your process. Sandboxes everywhere! You'll love that!
- 30. Deployments become soooeasy Like "push"-and-"pull"-easy!
- 31.
- 33. "How do wecreate images?"
- 34. Docker files Describe commandsto be run to create an image
- 35. # Nginx # # VERSION 0.0.1 FROM ubuntu MAINTAINERGuillaume J. Charmes <guillaume@dotcloud.com> # make sure the package repository is up to date RUN echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list RUN apt-get update RUN apt-get install -y inotify-tools nginx apache2 openssh-server
- 36. Docker file docker build. Image
- 37. "And how dowe run a process in a container?"
- 38. Image docker run <image><cmd> Container running <Cmd>
- 39. "I want tocreate a modified image"
- 40. Container docker commit <container><image name> Image
- 41. "Hey! I wantto deploy my image for the world to see!"
- 42. Image docker push <image> Registry Defaultsto http://index.docker.io
- 43. "And now myfriend wants to get my wonderful image to play with!" Yeah, sure... whatever
- 44. Registry docker search <imagename> docker pull <image> Image
- 46. "Wasn't that supposedto be a Ruby meetup?"
- 47. Let's simulate aRails cluster with a balancing Ruby proxy in front!
- 48. 3000 Docker container A 5000 5001 5002 5003 5004 3000 3000 3000 3000 3000 Docker containerDocker container Docker container Docker container Docker container B B B B B
- 49. 1. Create aRuby image: murielsalvan/ruby From ubuntu base image ● Using a Dockerfile ● Bonus: Upload it to index.docker.io via Github ●
- 50. # Ruby environment # #VERSION 0.2 FROM ubuntu MAINTAINER Muriel Salvan <muriel@x-aeon.com> RUN echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list RUN apt-get update RUN apt-get upgrade -y RUN apt-get install -y build-essential zlib1g-dev libssl-dev libreadline6-dev libyaml-dev ADD http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.0.tar.gz /tmp/ RUN cd /tmp && tar -xzf ruby-2.1.0.tar.gz && cd ruby-2.1.0 && ./configure && make && make install && cd .. && rm -rf ruby-2.1.0 && rm -f ruby-2.1.0.tar.gz
- 51. 2. Create aRails server image: murielsalvan/server From murielsalvan/ruby base image ● Using an interactive bash in a container to install and configure the Rails application ● Add a startup command: rails s ● Open default port 3000 ●
- 52. 3. Launch ndocker containers from murielsalvan/server ● Map each container port 3000 to host ports 5000+i
- 53. 4. Create anew image for the Ruby proxy: murielsalvan/proxy Based on murielsalvan/ruby ● Using an interactive bash to install and use em-proxy, targetting servers on ports 5000+i ● Add a startup command: ruby -w balancing.rb ● Open port 3000 ●
- 54. 5. Launch 1docker container from murielsalvan/proxy ● Map its guest port 3000 to host port 3000
- 55.
- 56.
- 58. Elapsed time (s)on Fibonacci computation Sponsored by the WTF effect! 50 45 40 35 30 Launch time Execution time 25 20 15 10 5 0 Without Docker With Docker
- 59. Memory consumption percontainer (kB) 180000 160000 140000 120000 Rails Linux container 100000 80000 60000 40000 20000 0 RSS VSZ The Linux container memory is always the same whatever the process in the container: 1,5MB RSS and 32MB VSZ
- 60.
- 61. Links Homepage Index of Dockerimages Dockerfile reference Getting started
- 62. That's all, folks! Source:xkcd Thanks for attending!