Presentation I presented at Codemotion 2015 in Rome. It's about how to build and share reproducible, portable development environments with Vagrant and Docker

1. ROME 27-28 march 2015
Alessandro Cinelli (cirpo)
Apt-get no more
let Vagrant, Puppet and Docker
take the stage

2. “it works on my
machine”

3. Title
subtitle

4. “Everything
is written in the
README”

5. “Everything
is written in the wiki”

6. Title
subtitle

7. “oh shit, I forgot to
update XYZ”

8. Title
subtitle

9. “cool this opensource
project on github…
how can I run it?”

10. “I don’t f*#c?ing care
about the platform,
I want to build
something cool
NOW!”

11. SOLUTIONS?

12. REMOTE
MACHINES
https://www.flickr.com/photos/mysterybee/1659329016

13. VIRTUAL
MACHINES

14. BUT VIRTUAL MACHINES COULD BE
HUUUUUUGE

15. enter

16. “Create and configure lightweight,
reproducible, and portable development
environments.”

17. YOU CAN HAVE A VM WITH FEW Kbs

18. download and install vagrant

19. download and install vagrant
create a Vagrantfile

20. download and install vagrant
create a Vagrantfile
run “vagrant up”

21. download and install vagrant
create a Vagrantfile
run “vagrant up”
enjoy

22. VagrantFile

23. VagrantFile
vm box name

24. VagrantFile
base box url
vm box name

25. VagrantFile
base box url
vm box name
vm ip

26. VagrantFile
base box url
vm box name
vm ipshared folder

27. VagrantFile
base box url
vm box name
vm ipshared folder
vm ram

28. VagrantFile
base box url
vm box name
vm ipshared folder
vm ram
vm #cpus

29. BOXES

30. BOXES

31. AUTOMATE
SETUP
PROCESS
(PROVISIONING)

32. PROVISIONERS

33. VM
$ vagrant up
provisioners
$ ssh
thanks Rohit Dantas

36. https://github.com/joindin/joindin-vm

38. how to automate the
provisioning?

44. X

45. IF THE STACK DOESN’T CHANGE
TOO MUCH
JUST PROVIDE A READY MADE
VM MACHINE…
THE PROVISIONER WILL ONLY
CHANGE CONFIG FILES

47. BUILD A NEW MACHINE IF
YOU HAVE TO UPGRADE/ADD
A SERVICE

49. “Operating-system-level virtualisation is a
virtualisation method where the kernel of an
operating system allows for multiple isolated
user space instances, instead of just one.
Such instances, often called CONTAINERS, or
jails, may look and feel like a real server from
the point of view of its owners and users.”
http://en.wikipedia.org/wiki/Docker_%28software%29

51. lego

56. ONE CONTAINER
=
ONE COMMAND

57. DIFFERENCE BETWEEN A VM AND DOCKER
HOST OS
GUEST
OS
HYPERVISOR
BIN/
LIBS
APP A
APP C
APP B
GUEST
OS
BIN/
LIBS
APP Z
APP H
APP B
GUEST
OS
BIN/
LIBS
APP A
APP D
APP L
HOST OS
DOCKER ENGINE
BIN/
LIBS
APP A
BIN/
LIBS
APP Z
BIN/
LIBS
APP D
BIN/
LIBS
APP B{ {
VM

58. VS
(VM)

59. FIGHT IMAGE

60. environment dev all (dev, staging, live)
boot speed minutes seconds
host dependency almost everywhere linux

61. VS
Full isolation and garanteed resources ?
Then go with vagrant/VM

62. VS
Isolated processes and tons of them?
Then go with Docker

63. THE DOCKER CREW INVENTED
CONTAINERS?

64. THE DOCKER CREW INVENTED
CONTAINERS?
no

65. THE DOCKER CREW INVENTED
CONTAINERS?
NO

66. Linux CONTAINERS (LCX)
came from FreeBsd jails and chroot,
at least 5 years ago
used by Heroku(PaaS)

67. Docker is a great, super
mega awesome way to
orchestrate containers

68. numbers

70. DIFFERENCE BETWEEN DOCKER AND A VM
WITH DOCKER
YOU DON’T HAVE THE
OVERHEAD GIVEN BY THE
VIRTUALISATION

71. DockerFile

72. DockerFile
container image

73. DockerFile
container image
commands while building the container
}

74. DockerFile
container image
commands while building the container
copy some content while building
the container
}

75. DockerFile
container image
commands while building the container
copy some content while building
the container
declare a volume: data accessible by other containers
and useful to mount a filesystem
}

76. DockerFile
container image
commands while building the container
copy some content while building
the container
declare a volume: data accessible by other containers
and useful to mount a filesystem
environment variable
}

77. DockerFile
container image
commands while building the container
copy some content while building
the container
declare a volume: data accessible by other containers
and useful to mount a filesystem
environment variable
container port exposed to other containers
}

78. DockerFile
container image
commands while building the container
copy some content while building
the container
declare a volume: data accessible by other containers
and useful to mount a filesystem
environment variable
container port exposed to other containers
the container command
executed when you run it
}

79. Build the container:
$: docker build -t node-app .
Run the container:
$: docker run -it node-app

80. Build another container:
$: docker build -t my-redis .
Run the container:
$: docker run -it my-redis

81. Link them and enjoy:
$: docker run --link my-redis:redis
-p 9200:9200 -d node-app

82. DEMO

83. windows 98 bsod

84. +

85. why vagrant and docker?
YES YOU CAN!

86. Docker still requires Linux
kernel 3.8 or higher.
This bounds considerably the
environments Docker can
natively run on.

88. BUT YOU SHOULDN’T…

89. docker-compose (prev fig)

92. dubai

93. dubai

94. namshi

95. namshinamshi

96. SOA

97. Service Oriented
Architechture

99. DOCKER IS A PERFECT MATCH!

100. DOCKER IS A PERFECT MATCH!
EVEN FOR DEVELOPMENT

101. fake service? no problem
DO YOU NEED TO FAKE A
SERVICE?
NO PROBLEM, JUST SPIN UP A
CONTAINER IN NO TIME

102. NGINX-PROXY

103. https://github.com/jwilder/nginx-proxy

104. APIDOC (DEMO)

105. APIDOC (DEMO)

106. NGINX-PROXY

107. DOCKER PROS
Matter of seconds to start an image
Can start multiple copies immediately
Central repo for images
You can go on staging and live from dev with the same
container
Versioning

108. DOCKER CONS
It really works really well just on Linux atm
It’s a young project, things change very fast
Lack of proper management tool

109. DOCKER CONS
It really works really well just on Linux atm
It’s a young project, things change very fast
Lack of proper management tool

110. boot2docker
Kitematic

111. github.com/namshi/node-dock
node-dock

112. NODE-DOCK

113. Docker disk space cleanup
$: docker rm $(docker ps -a -q)
$: docker images | grep "<none>" | awk
'{ print "docker rmi " $3 }' | bash

114. https://github.com/dummymael/dotfiles/blob/
1859a36afba2252f86a0a1ff8d5fb442e74b7a0e/tools/
docker_clean_vfs.py
$: pip install docker-py

115. @cirpo
github.com/cirpo
/

117. THANKS!

118. credits
http://blog.docker.com/media/Docker_Infographic_FINAL.jpg
https://www.flickr.com/photos/chuddlesworth/7059061549
Tim Haak https://speakerdeck.com/timhaak/vagrant-is-so-last-year-why-arent-you-using-docker-yet
Rohit Dantas https://speakerdeck.com/rohitdantas