Introduction to "Chef" framework
Silesian Ruby Users Group
Wojciech Wn¦trzak
December 3, 2010
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What Is Chef?
Open Source (Apache License v. 2.0)
Framework
Ruby
Infrastructure con guration management tool
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Chef Is Young
Released on January 15th, 2009
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Why To Use Chef?
Only one administration guy in company?
Forces order in system
Existing solutions for your problems
Best practices
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How To Use Chef?
chef-client + chef-server
chef-client + Opscode Platform
chef-solo
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Chef Server
Ruby gem (chef-server)
Stores cookbooks
Stores information about nodes
Accessbile by REST API
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Chef Server Elements
CouchDB stores node informations
SOLR data indexing
RabbitMQ helps in indexing
Merb API and web user interface
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Chef Server Elements
CouchDB stores node informations
SOLR data indexing
RabbitMQ helps in indexing
Merb API and web user interface
That is lot of stu!
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Opscode Platform
Free plan (upto 5 nodes)
Con guration step by step
Organizations and users managment
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Chef Client
Ruby gem (chef)
Runs on machine that we want to con gure
Communicates with chef server
Authenticates using RSA keys
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Server Clients
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Chef Solo
Part of chef gem
Standalone run (without connecting to server)
Uses cookbooks from local tarballs
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Simple Work ow
Write cookbook with recipe
Upload it to chef server
De ne run list by:
editing node on chef server
passing JSON le to chef-client
Run chef-client on desired machine
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Cookbooks
Cookbooks for Chef are like RubyGems for
Ruby
1
1I couldn't nd author
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Cookbook Skeleton
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Example Attributes File
set[:postgresql][:version] = "8.4"
set[:postgresql][:dir] =
"/etc/postgresql/{node[:postgresql][:version]}/main"
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PostgreSQL Server Recipe
include_recipe "postgresql::client"
package "postgresql-{node[:postgresql][:version]}" do
action :install
end
template "{node[:postgresql][:dir]}/postgresql.conf" do
source "postgresql.conf.erb"
owner "postgres"
group "postgres"
mode "0600"
end
service "postgresql-{node[:postgresql][:version]}" do
action :start
end
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Recipe Features
include_recipe "postgresql::client"
package "postgresql-{node[:postgresql][:version]}"
service "postgresql" do
service_name "postgresql-{node[:postgresql][:version]}"
supports :restart => true, :status => true
action :nothing
end
template "{node[:postgresql][:dir]}/postgresql.conf" do
source "postgresql.conf.erb"
owner "postgres"
group "postgres"
mode "0600"
notifies :restart, "service[postgresql]"
end
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Package Providers
Apt
Yum
MacPorts
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Package Providers
Apt
Yum
MacPorts
Many more
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Supported Systems
Debian
Gentoo
FreeBSD
MacOSX
Solaris
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Supported Systems
Debian
Gentoo
FreeBSD
MacOSX
Solaris
Windows
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Supported Systems
Debian
Gentoo
FreeBSD
MacOSX
Solaris
Windows
And more
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Resources2
package
template
le
user
execute
script (bash, ruby, perl, python, csh)
http_request
deploy
2http://wiki.opscode.com/display/chef/Resources
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Resources2
package
template
le
user
execute
script (bash, ruby, perl, python, csh)
http_request
deploy
Many more
2http://wiki.opscode.com/display/chef/Resources
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Additional Tools - Ohai
Released as a gem ohai
Collects system con guration/information
Returns JSON
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Additional Tools - Knife
Part of chef gem
Console tool for chef server managment
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Tips
If using RVM, use rvmsudo for chef-client
Take a look at chef bootstrap3
Remember that Ruby (Chef) uses sh, not bash
3http://wiki.opscode.com/display/chef/Bootstrap+Chef+RubyGems+
Installation