Chef EC2 tutorial post http://bit.ly/avivby-chef-ec2

appserver.rb

name "appserver"
description "An application server"
run_list(%w{
  recipe[apache2]
})

clone.sh

git clone git://github.com/opscode/chef-repo.git

cp.sh

cp USERNAME.pem ORGANIZATION-validator.pem knife.rb .chef

create.sh

knife ec2 server create "role[appserver]" --image ami-f0e20899 \
   --groups chef --ssh-user ubuntu --ssh-key my-key

download.sh

knife cookbook site vendor apache2

install.sh

gem install chef net-ssh net-ssh-multi fog highline

knife.rb

knife[:aws_access_key_id]     = "Your AWS Access Key"
knife[:aws_secret_access_key] = "Your AWS Secret Access Key" 

upload.sh

knife cookbook upload apache2
knife role from file roles/appserver.rb