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DESCRIPTION
Docker - Lightweight Virtualization with Containers
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Why?
That eternal crap…!(i.e Having no idea what’s wrong)
Passing on the headache!Not the solution
Some use cases• Solving dependency hell • Configure once, run anywhere • Continuous integration • Create sandboxed app • Run your own PaaS
So, what’s Docker anyway?
Isolation Portability
Provisioning
Hypervisors/VM
Chef, Puppet, Ansible
Your app, libraries
Docker
Docker vs. VMHardwareLinux/Kernel
Container Container
Container Container
Container Container
HardwareLinux/Kernel
VMLinux/Kernel
VMLinux/Kernel
VMLinux/Kernel
VMLinux/Kernel
Shared Resource, Lightweight, Portable, Fast to boot
Dedicated Resource, Heavy, Not portable, Comparatively slower boot
Under the HoodLXC
Dream inside dream inside dream….
(The Inception in Linux)
Namespaces & cgroups
Isolated pid, net, uid….
Copy-on-write
FilesystemAUFS, btrfs, ZFS….
InstallationDo It Yourself
Docker Vocabulary
• Repository
• Image
• Tag
$ docker images ubuntuREPOSITORY TAG IMAGE ID ubuntu 10.04 9cc9ea5ea540 ubuntu 12.04 9cd978db300e ubuntu 12.10 5ac751e8d623 ubuntu 13.04 eb601b8965b8 ubuntu 13.10 9f676bd305a4 ubuntu latest 9cd978db300e ubuntu lucid 9cc9ea5ea540 ubuntu precise 9cd978db300e ubuntu quantal 5ac751e8d623 ubuntu raring eb601b8965b8 ubuntu saucy 9f676bd305a4
Docker Vocabulary
• Registry $ docker pull ubuntu:12.04Pulling repository ubuntu c0fe63f9a4c1: Pulling dependent layers 511136ea3c5a: Download complete 6170bb7b0ad1: Download complete 79fdb1362c84: Downloading [===> ]56 MB/66.64 MB 10m9s
Docker Vocabulary
• Index $ docker loginUsername: mehdi Password: Email: [email protected] Login Succeeded
Docker Vocabulary• Container
$ docker run ubuntu:12.04 echo Hello WorldHello World
$ docker run -i -t ubuntu:12.04 /bin/bashroot@a09d485c9a9f:/# uname -a Linux a09d485c9a9f 3.13.3-tinycore64 #1 SMP Wed Mar 26 03:16:13 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux !root@a09d485c9a9f:/#
$ docker psCONTAINER ID IMAGE COMMAND CREATED STATUS !f0638f0a1c7a ubuntu:12.04 /bin/bash 46 minutes ago Up 4 seconds
Tip: Press Ctrl+P and Ctrl+Q to detach running containers
Docker Vocabulary• Dockerfile $ cat Dockerfile
FROM ubuntu:12.04!!MAINTAINER Mehdi Hasan "[email protected]"!!RUN apt-get -y install python-software-properties!RUN add-apt-repository ppa:chris-lea/node.js!RUN apt-get update!RUN apt-get -y install python g++ make nodejs!
$ docker build -t mehdi/nodejs .There is a trailing dot
$ docker push mehdi/nodejsImage c0fe63f9a4c1 already pushed, skipping Image 5ff6986cd174 already pushed, skipping Image 3867fae91348 already pushed, skipping Image 4574f80c91e4 already pushed, skipping Image 37c2cc34fa4e already pushed, skipping 757db77867dd: Image successfully pushed Pushing tag for rev [757db77867dd] on {https://registry-1.docker.io/v1/repositories/mehdi/nodejs/tags/latest}
Any idea why these images are skipped?
Container vs. Image!Still Puzzled?
Running container from an image:
Creating image from a container:$ docker ps -a!$ docker commit -m “Image description" <CONTAINER_ID> <USERNAME>/<REPO>
$ docker run -i -t ubuntu:12.04 /bin/bash
Lets see a Demo
Docker Workflow
Dev ProdRegistry
Public/Private
DemoDeploying a sample app on the cloud using Docker
Your Next Weekend Fun Project: Deploy something with Dokku
DokkuDocker powered mini-Heroku in around 100 lines of Bash
See the demo here: http://vimeo.com/68631325
https://github.com/progrium/dokku
The rabbit hole goes deeper than that…
• How to deal with data, logs, file uploads? Where to store? Inside container? Inside host? Inside another container?Hint: Read http://docs.docker.io/en/latest/use/working_with_volumes/
• How to deal with distributed systems? Hint: Follow http://www.centurylinklabs.com/category/docker-posts/
Keep following…
• https://coreos.com/
• http://www.confd.io/
• http://www.serfdom.io/
• http://www.dockerbook.com/ (Not yet released)*
* As of May, 2014
Docker cheat sheet
• https://gist.github.com/wsargent/7049221
• https://coderwall.com/p/2es5jw
Questions?