In the Kitchen
Cooking with Chef

Tyler Hunt
@tylerhunt

homegrown apps

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Problem

System
Administration

Configuration
Management

External DSL
vs.
Internal DSL

SSL
vs.
OpenID

XML-RPC
vs.
RESTful

Test::Unit + RSpec + Mocha
vs.
RSpec

Lines of Code
Puppet Chef
http://www.ohloh.net/p/compare?project_0=puppet&project_1=opscode-chef

gem install chef

Opscode

“Chef is a state based,
declarative configuration
management engine.You
define recipes of how you
want your system to look
and then chef makes it so.”
— Ezra Zygmuntowicz

OHAI

gem install ohai

./bin/ohai

{
\"kernel\": {
\"machine\": \"x86_64\",
\"name\": \"Linux\",
\"os\": \"GNU\\/Linux\",
\"version\": \"#1 SMP Wed Aug 20 21:08:51 UTC 2008\",
\"release\": \"2.6.24-19-xen\"
},
\"uptime_seconds\": 12043422,
\"platform_version\": \"8.04\",
\"platform\": \"ubuntu\",
\"virtualization\": {
\"role\": \"guest\",
\"emulator\": \"xen\"
},
\"os\": \"linux\",
\"idletime\": \"115 days 23 hours 34 minutes 06 seconds\",
\"idletime_seconds\": 10020846,
\"lsb\": {
\"id\": \"Ubuntu\",
\"description\": \"\\\"Ubuntu 8.04.1\\\"\",
\"codename\": \"hardy\",
\"release\": \"8.04\"
},
\"os_version\": \"2.6.24-19-xen\"
}

Nodes

Cookbooks

Recipes

Definitions
def•i•ni•tions
(děf'ə-nĭsh'ənz) n. pl.

Attributes

Libraries

Files

Templates
Templates
Templates
Templates
Templates
Templates
Templates

cookbooks/
my_cookbook/
attributes/
definitions/
files/
libraries/
recipes/
templates/

gems Mash.new unless attribute?(\"gems\")
gems[:rake] ||= {
:version => \"0.8.3\"
}
gems[:nokogiri] ||= {
:version => \"1.0.5\"
:source => \"http://gems.github.com/\"
}

{
\"gems\": {
\"rake\": {
\"version\": \"0.8.3\"
},
\"nokogiri\": {
\"version\": \"1.0.5\",
\"source\": \"http://gems.github.com\"
}
}
}

node[:gems].each do |name, gem|
gem_package name do
version gem[:version] if gem[:version]
source gem[:source] if gem[:source]
action :install
end
end

node[:gems].each do |name, gem|
gem_package name do
version gem[:version] if gem[:version]
source gem[:source] if gem[:source]
action :install
end
end

Resources
Α
Β Γ

cron
execute
directory
file
group
user
link
package
remote_directory
remote_file
route
script
service
template
http_request

Providers

node[:gems].each do |name, gem|
gem_package name do
version gem[:version] if gem[:version]
source gem[:source] if gem[:source]
action :install
end
end

directory \"/tmp/something\" do
owner \"root\"
group \"root\"
mode 0755
action :create
end

file \"/tmp/something\" do
owner \"root\"
group \"root\"
mode 0755
action :touch
end

cron \"noop\" do
hour \"5\"
command \"/bin/true\"
end

execute \"slapadd\" do
command \"slapadd < /tmp/something.ldif\"
creates \"/var/lib/slapd/uid.bdb\"
action :run
end

group \"admin\" do
gid 999
end

user \"random\" do
comment \"Random User\"
uid \"1000\"
gid \"users\"
home \"/home/random\"
shell \"/bin/zsh\"
password \"$1$JJsvHslV$szsCjVEroftprNn4JHtDi.\"
end

link \"/tmp/passwd\" do
to \"/etc/passwd\"
link_type :symbolic
end

package \"tar\" do
version \"1.16.1-1\"
action :install
end

# file from cookbook
remote_file \"/tmp/test\" do
source \"test\"
mode 0644
end
# file from remote source
remote_file \"/tmp/testfile\" do
source \"http://example.com/files/test\"
mode 0644
end

remote_directory \"/tmp/remote_something\" do
source \"something\"
files_backup 10
files_owner \"root\"
files_group \"root\"
files_mode 0644
owner \"nobody\"
group \"nobody\"
mode 0755
end

route \"20.0.0.0\" do
gateway \"10.0.0.20\"
metric 5
route_type :net
netmask \"255.255.0.0\"
end

script \"install_something\" do
interpreter \"bash\"
user \"root\"
cwd \"/tmp\"
code <<-EOH
wget http://example.com/tarball.tar.gz
tar -zxf tarball.tar.gz
cd tarball
./configure
make
make install
EOH
end

service \"example_service\" do
case node[:platform]
when \"CentOS\", \"RedHat\", \"Fedora\"
service_name \"redhat_name\"
else
service_name \"other_name\"
end
supports :restart => true
action [ :enable, :start ]
end

template \"/etc/config.conf\" do
source \"config.conf.erb\"
variables({
:timeout => 360
})
end

http_request \"posting data\" do
url \"http://example.com/check_in\"
message :some => \"data\"
end

http://flickr.com/photos/philipyk/160559925/
http://flickr.com/photos/florin_mogos/2523984446/
http://flickr.com/photos/giorgiocardellini/271092412/
http://flickr.com/photos/onkel_wart/2487637968/
http://flickr.com/photos/dunechaser/161509118/

http://radlab.cs.berkeley.edu/wiki/Chef
http://junglist.gen.nz/chef-vs-puppet/
http://wiki.opscode.com/display/chef/Home
http://brainspl.at/articles/2009/01/15/
http://brainspl.at/articles/2009/01/31/

Thank You