boot_linode.rb

def request(linode_method, query_args = {})
  begin
    args = {
      api_key:    @api_key,
      api_action: linode_method,
    }.merge(query_args).map{|k,v| "#{k}=#{v}"}.compact.join('&')

    uri = URI("https://api.linode.com/?#{args}")

    http = Net::HTTP.new(uri.host, uri.port)
    http.use_ssl = true
    req = Net::HTTP::Get.new(uri)

    resource  = http.request(req)
    json_body = JSON.parse(resource.body)

    return json_body['DATA']
  rescue StandardError => e
    puts "HTTP Request failed (#{e.message})"
  end
end

def boot_linode
  # CALCULATE AND SET HOSTNAME
  name          = Hostname.new.generate
  domain        = 'srvnce.com'
  hostname      = "#{name}.#{domain}"
  app_name      = 'app_name'
  role          = 'app'
  compiled_role = "#{app_name}-#{role}"
  root_pass     = SecureRandom.hex

  puts "Booting #{hostname}!"


  # FETCH SETUP PARAMATERS
  datacenter_id = request('avail.datacenters').
                  select{|center| center['ABBR']=='london'}.
                  first['DATACENTERID']

  plan_id   = request('avail.linodeplans').
              select{|plan| plan['LABEL']=='Linode 1024'}.
              first['PLANID']

  dist_id   = request('avail.distributions').
              select{|dist| dist['LABEL']=='Ubuntu 14.04 LTS'}.
              first['DISTRIBUTIONID']

  kernel_id = request('avail.kernels').
              select{|dist| dist['LABEL'].start_with?('Latest 64 bit')}.
              first['KERNELID']

  # CREATE SERVER
  linode_id = request('linode.create', {
    'DatacenterID' => datacenter_id,
    'PlanID' => plan_id}
  )['LinodeID']

  # CREATE MAIN DISK
  disk = request('linode.disk.create', {
    'LinodeID'           => linode_id,
    'FromDistributionID' => dist_id,
    'rootPass'           => root_pass,
    'rootSSHKey'         => ssh_key,
    'Label'              => 'Ubuntu 14.04 LTS Disk',
    'Type'               => 'ext4',
    'Size'               => '20000',
  })['DiskID']

  # CREATE SWAP DISK
  swap = request('linode.disk.create', {
    'LinodeID' => linode_id,
    'Label'    => '512MB Swap Image',
    'Type'     => 'swap',
    'Size'     => '512',
  })['DiskID']

  sleep(10)

  # CREATE KERNEL-CONFIG
  config = request('linode.config.create', {
    'LinodeID' => linode_id,
    'KernelID' => kernel_id,
    'Label'    => 'My Ubuntu 14.04 LTS Profile',
    'DiskList' => "#{disk},#{swap}",
  })

  sleep(10)

  # UPDATE LABEL AND DISPLAY-GROUP
  set_label = request('linode.update', {
    'LinodeID'         => linode_id,
    'Label'            => name,
    'lpm_displayGroup' => compiled_role,
  })

  # SET DNS
  ip_addr = request('linode.ip.list', {
    'LinodeID' => linode_id,
  }).first['IPADDRESS']

  # BOOT SERVER
  boot = request('linode.boot', {
    'LinodeID' => linode_id,
  })
end