Provision a Ubuntu 10.04 LTS (lucid) 256 server on Rackspace CloudServers with ssh password logins disabled

create_server.rb

#!/usr/bin/env ruby

# This script provisions a Ubuntu 10.04 LTS (lucid) 256 server on
# Rackspace CloudServers with ssh password logins disabled and only
# the
# public key at ~/.ssh/id_rsa.pub authorized to login. The server will
# be terminated after 60 seconds. You need a CloudServers username and
# api_key to test this script.

require 'rubygems'
require 'fog'
require 'net/ssh'

unless ENV['RACKSPACE_API_KEY'] and ENV['RACKSPACE_USERNAME']
  puts "RACKSPACE_API_KEY and or RACKSPACE_USERNAME env variable(s) not set"
  exit
end

def data_file(path)
  unless @files_by_name
    @data ||= DATA.readlines.join
    contents = @data.split(/^##.+\n/); contents.shift
    names = @data.scan(/^## (.+)$/).map{|e| e.first }
    @files_by_name = names.inject({}){|m,e| m[e] = contents.shift; m}
  end
  {"path" => path, "contents" => @files_by_name[path]}
end

compute = Fog::Compute.new(
                           :provider           => 'Rackspace',
                           :rackspace_api_key  => ENV['RACKSPACE_API_KEY'],
                           :rackspace_username => ENV['RACKSPACE_USERNAME']
                           )

server = compute.servers.create(
                                :flavor_id => 1, # 256MB
                                :image_id => 49, # Ubuntu 10.04 LTS 64bit
                                :personality => [
                                                 {
                                                   'path' => "/root/.ssh/authorized_keys",
                                                   'contents' => File.read(File.expand_path("~/.ssh/id_rsa.pub"))
                                                 },
                                                 data_file("/etc/ssh/sshd_config"),
                                                 data_file("/var/lib/misc/bootstrap.sh")
                                                ]
                                )
puts "Creating #{server.name} (#{compute.images.get(server.image_id).name} #{compute.flavors.get(server.flavor_id).name})"
server.wait_for { ready? }

Net::SSH.start(server.addresses["public"].first, 'root') do |ssh|
  ssh.exec!("/bin/bash /var/lib/misc/bootstrap.sh") do |channel, stream, data|
    print data
  end
end

puts "root@#{server.addresses["public"].first} is ready"
sleep 45
server.destroy

__END__
## /etc/ssh/sshd_config
Port 22
Protocol 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
UsePrivilegeSeparation yes
KeyRegenerationInterval 3600
ServerKeyBits 768
SyslogFacility AUTH
LogLevel INFO
LoginGraceTime 120
PermitRootLogin without-password
StrictModes yes
RSAAuthentication yes
PubkeyAuthentication yes
IgnoreRhosts yes
RhostsRSAAuthentication no
HostbasedAuthentication no
PermitEmptyPasswords no
ChallengeResponseAuthentication no
PasswordAuthentication no
X11Forwarding no
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes
AcceptEnv LANG LC_*
Subsystem sftp /usr/lib/openssh/sftp-server
UsePAM yes

## /var/lib/misc/bootstrap.sh
#!/bin/bash

if [ ! -f /usr/bin/chef-client ]; then
  apt-get update
  apt-get install -y ruby ruby1.8-dev build-essential wget libruby-extras libruby1.8-extras
  cd /tmp
  wget http://production.cf.rubygems.org/rubygems/rubygems-1.6.2.tgz
  tar zxf rubygems-1.6.2.tgz
  cd rubygems-1.6.2
  ruby setup.rb --no-format-executable

  gem update --no-rdoc --no-ri
  gem install ohai --no-rdoc --no-ri --verbose
  gem install chef --no-rdoc --no-ri --verbose
fi

Thanks a bunch for this. FYI you now need to call Base64.encode64() on any file contents that you create via the :personality key.