Docker

An introduction to docker. We’ll discuss what docker is and what it isn’t, comparing it to solutions you might be more familiar with (virtualbox, vmware, etc). Next we’ll see how docker can ease development and deployment of applications with its concept of containers.

http://2014.phpday.it/

Transcript

2. asm89 / @iam_asm89
5. Dependencies
6. ?
7. ?
8. ?
13. Deployment
21. Linux containers Run everywhere
22. Linux containers Run everything
24. What is a linux container?
25. Lightweight VM • Own process space • Own network interface • Can run stuff as root • Can have its own /sbin/init “machine container”
26. Lightweight VM • Own process space • Own network interface • Can run stuff as root • Can have its own /sbin/init “machine container” • Not having its own /sbin/init • Isolated processes • Share kernel with the host “application container” Chroot on steroids
27. VM vs Container
28. $ ps aux | wc -l 174 $ docker run -it ubuntu bash root@86f8213d57e0:/# ps aux USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 4.0 0.0 18152 1856 ? Ss 23:05 0:00 bash root 9 0.0 0.0 15568 1148 ? R+ 23:05 0:00 ps aux
29. Docker 101
30. $ sudo apt-get update $ sudo apt-get install docker.io $ sudo ln -sf /usr/bin/docker.io /usr/local/bin/docker
31. $ docker pull ubuntu
32. $ docker images | grep ubuntu ubuntu 13.10 5e019ab7bf6d 3 weeks ago 180 MB ubuntu saucy 5e019ab7bf6d 3 weeks ago 180 MB ubuntu precise 74fe38d11401 3 weeks ago 209.4 MB ubuntu 12.04 74fe38d11401 3 weeks ago 209.4 MB ubuntu 12.10 a7cf8ae4e998 3 weeks ago 171.2 MB ubuntu quantal a7cf8ae4e998 3 weeks ago 171.2 MB ubuntu 14.04 99ec81b80c55 3 weeks ago 266 MB ...
33. $ docker run ubuntu echo “hello world” hello world
34. Demo
35. $ docker run -d ubuntu ping 127.0.0.1
36. $ docker run -d ubuntu ping 127.0.0.1 $ docker ps
37. $ docker run -d ubuntu ping 127.0.0.1 $ docker ps $ docker attach <container_id>
38. $ docker run -d ubuntu ping 127.0.0.1 $ docker ps $ docker attach <container_id> $ docker stop/start/restart <container_id>
39. Demo
40. $ docker run ubuntu rm /etc/passwd
41. $ docker run ubuntu rm /etc/passwd $ docker run ubuntu cat /etc/passwd root:x:0:0:root:/root:/bin/bash …
42. $ docker run ubuntu rm /etc/passwd $ docker run ubuntu cat /etc/passwd root:x:0:0:root:/root:/bin/bash … $ docker ps -n=2
43. $ docker run ubuntu rm /etc/passwd $ docker run ubuntu cat /etc/passwd root:x:0:0:root:/root:/bin/bash … $ docker ps -n=2 $ docker commit <container_id> borked-ubuntu
44. $ docker run ubuntu rm /etc/passwd $ docker run ubuntu cat /etc/passwd root:x:0:0:root:/root:/bin/bash … $ docker ps -n=2 $ docker commit <container_id> borked-ubuntu $ docker run borked-ubuntu cat /etc/passwd cat: /etc/passwd: No such file or directory
45. Demo
46. Creating images
47. Manually In container $ apt-get install php5-cli $ echo "<?php echo 'hello phpday!';" > /index.php On host $ docker commit <id> <name>
48. Manually In container $ apt-get install php5-cli $ echo "<?php echo 'hello phpday!';" > /index.php On host $ docker commit <id> <name> FROM ubuntu RUN apt-get install -y php5-cli RUN echo "<?php echo 'hello phpday!';" > /index.php EXPOSE 8000 ENTRYPOINT ["php", "-S", ":8000"] Dockerfile
49. Demo
50. Registry
52. Docker powered mini-Heroku in around 100 lines of Bash.
53. $ git push dokku master
55. PHP Ruby Nodejs Java Scala Go Perl ...
56. $ wget -qO- <url> | sudo DOKKU_TAG=v0.2.3 bash https://raw.github.com/progrium/dokku/v0.2.3/bootstrap.sh
57. Demo
58. Try it!
59. #docker @ freenode http://docker.io
60. Happy shipping!
61. @iam_asm89 https://joind.in/11309