My custom Chef bootstrap for Amazon Linux

amazon-linux.erb

bash -c '
<% if ENV['ROLES'].split(",").size > 1 %>
  HOSTNAME_PREFIX=box
<% else %>
  HOSTNAME_PREFIX=<%= ENV['ROLES'].gsub('_', '-') %>
<% end %>

yum upgrade -y
yum install -y gcc gcc-c++ make zlib-devel openssl-devel patch readline-devel

rpm -e --nodeps ruby ruby-libs
rpm -ivh --force http://files.s--e.net/ruby-enterprise-1.8.7.2012.02.streeteasy.x86_64.rpm

export PATH=/usr/local/bin:$PATH

cd /tmp
curl http://production.cf.rubygems.org/rubygems/rubygems-1.3.7.tgz | tar xz
cd rubygems-1.3.7
ruby setup.rb

gem install --no-ri --no-rdoc -v 0.10.8 chef 

# Set hostname
hostname=$HOSTNAME_PREFIX-`ohai | grep instance_id | cut -d "\"" -f 4 | cut -c 3-5`
ip_addr=`ifconfig eth0 | grep "inet addr:" | cut -d ":" -f 2 | cut -d " " -f 1`

sed -i "s/localhost.localdomain/$hostname.s--e.net/" /etc/sysconfig/network

echo $ip_addr $hostname.s--e.net $hostname >>/etc/hosts

/sbin/service network restart

hostname $hostname.s--e.net

# Configure Chef
mkdir /etc/chef

cat >/etc/chef/validation.pem <<-EOF
# your validation key goes here
EOF

cat >/etc/chef/client.rb <<-EOF
log_level        :info
log_location     "/var/log/chef.log"
chef_server_url  # your chef-server URL
validation_client_name "chef-validator"
EOF

mkdir /root/.chef

cat >/root/.chef/knife.rb <<-EOF
log_level                :info
log_location             STDOUT
node_name                "jd"
client_key               "/root/.chef/jd.pem"
validation_client_name   "chef-validator"
validation_key           "/etc/chef/validation.pem"
chef_server_url          # your chef-server URL
cache_type               "BasicFile"
cache_options( :path => "/root/.chef/checksums" )
EOF

cat >/root/.chef/jd.pem <<-EOF
# your private key goes here
EOF

# Run chef-client to register with chef-server
chef-client -E <%= ENV['ENVIRONMENT'] %>

# Add roles to our run list
<% ENV['ROLES'].split(",").each do |role_name| %>
  knife node run_list add $hostname.s--e.net "role[se_<%= role_name %>]"
<% end %>

# Clean up chef config
rm -rf /root/.chef
rm /etc/chef/validation.pem

# Start chef-client
chef-client --once --daemonize
'