How to be a Chef (Developer Edition)

How to be a Chef
(Developer Edition)
Rodrigo Ayala
Developer
sábado, 1 de junio de 13

@RodrigoAyala

(Web) Apps are a bunch of software
interconnected in a nice way

But software lives
on servers

And we can’t to play
dumb with that

tions?

Cloud, or local server

Local server

Local server
Pros:

Local server
Pros:
✓You know where your data lives

Local server
Pros:
✓ The equipment is yours and you can
personalize as you want

Local server
Pros:
Cons:

Local server
Pros:
Cons:
✓You are responsible to give power and a
good Tº to the server

Local server
Pros:
Cons:
✓ The environment should be able to support
catastrophes. (TIER)

Local server
Pros:
Cons:
✓ The environment should be able to support
catastrophes. (TIER)
✓It needs a lot of conﬁguration (and that
needs a lot of time)

Cloud

Cloud
Pros:

Cloud
Pros:
✓You don’t need an huge initial investment to
buy (expensive) servers

Cloud
Pros:
✓You can dynamically create an IT
architecture

Cloud
Pros:
architecture
Cons:

Cloud
Pros:
architecture
Cons:
✓ If for any reason the cloud service is down,
you can’t do anything but wait

Cloud
Pros:
architecture
Cons:
✓ If for any reason the cloud service is down,
you can’t do anything but wait
✓It needs a lot of conﬁguration (and that
needs a lot of time)

Cloud
IaaS PaaS

Cloud
IaaS PaaS
Infrastructure as a Service
✓Flexible
✓Cheap

Cloud
IaaS PaaS
Platform as a Service
✓First deploy in just minutes
✓You don’t have to worry about
software updates

Cloud
IaaS PaaS
¿ ?

Conﬁguration Management tool
Written in Ruby
Open Source

88.3K lines of code
7.497 commits
Since March 2008
https://github.com/opscode/chef
* Metrics by http://www.ohloh.net/p/opscode-chef

Let’s see how it works

Chef

Chef
Chef Server
Chef Solo

Chef Server
Chef Client
Chef Client
Chef Client
Chef Server
(Repository)

Chef Solo
Forever Alone version

Chef Solo
Chef Solo Chef Solo Bootstraped

Cookbookhttp://community.opscode.com/cookbooks
https://github.com/opscode-cookbooks

★ Java
★ postgreSQL
★ MySQL
★ SELinux
★ RVM
★ etc
Cookbook

Recipes

Recipes
Are included on cookbooks
Written in Ruby
There are functions available as DSL
You can use ERB templates with Recipes

Resources
Used on recipes
Deﬁne actions that can be taken
There are functions available as DSL
Service, yum_package, execute or directory are
a few examples of this
http://docs.opscode.com/chef/resources.html

template '/etc/sudoers' do
source 'sudoers.erb'
mode '0440'
owner 'root'
group platform?('freebsd') ? 'wheel' : 'root'
variables(
:sudoers_groups => node['authorization']['sudo']['groups'],
:sudoers_users => node['authorization']['sudo']['users'],
:passwordless => node['authorization']['sudo']['passwordless'],
:include_sudoers_d => node['authorization']['sudo']['include_sudoers_d'],
:agent_forwarding => node['authorization']['sudo']['agent_forwarding'],
:sudoers_defaults => node['authorization']['sudo']['sudoers_defaults']
)
not_if { node[:some_value]}
end
Recipe example

Run list

{
"run_list":[
"recipe[user]",
"recipe[sudo]",
"recipe[main::user]",
"recipe[yum::epel]",
"recipe[nginx]",
"recipe[redis::server]",
"recipe[build-essential]",
"recipe[rvm::user]",
"recipe[main]",
"recipe[nginx_conf]",
"recipe[main::nginx]",
"recipe[main::dirs]"
]
],

Let’s cook!

How to start
$ gem install knife-solo
$ gem install chef-solo
$ gem install chef

How to start
$ knife solo bootstrap user@ipnumber nodes/ip.json -i
pemfile.pem

https://github.com/opscode/chef-repo
Empty cookbook

“Bundler” for Chef
https://github.com/applicationsonline/librarian-chef

Gracias!

How to be a Chef (Developer Edition)

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