Class: Azure::Role

Inherits:
Object
  • Object
show all
Includes:
AzureUtility
Defined in:
lib/azure/service_management/role.rb

Constant Summary collapse

TCP_ENDPOINTS_MAPPING = 
{ "3389" => "Remote Desktop",
"5986" => "PowerShell",
"22" => "SSH",
"21" => "FTP",
"25" => "SMTP",
"53" => "DNS",
"80" => "HTTP",
"110" => "POP3",
"143" => "IMAP",
"389" => "LDAP",
"443" => "HTTPs",
"587" => "SMTPS",
"995" => "POP3S",
"993" => "IMAPS",
"1433" => "MSSQL",
"3306" => "MySQL" }.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from AzureUtility

#error_from_response_xml, #xml_content

Constructor Details

#initialize(connection) ⇒ Role

Returns a new instance of Role.



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# File 'lib/azure/service_management/role.rb', line 205

def initialize(connection)
  @connection = connection
end

Instance Attribute Details

#connection ⇒ Object

Returns the value of attribute connection.



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# File 'lib/azure/service_management/role.rb', line 182

def connection
  @connection
end

#deployname ⇒ Object

Returns the value of attribute deployname.



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# File 'lib/azure/service_management/role.rb', line 183

def deployname
  @deployname
end

#hostedservicename ⇒ Object

Returns the value of attribute hostedservicename.



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# File 'lib/azure/service_management/role.rb', line 183

def hostedservicename
  @hostedservicename
end

#hostname ⇒ Object

Returns the value of attribute hostname.



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# File 'lib/azure/service_management/role.rb', line 185

def hostname
  @hostname
end

#ipaddress ⇒ Object

Returns the value of attribute ipaddress.



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# File 'lib/azure/service_management/role.rb', line 182

def ipaddress
  @ipaddress
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/azure/service_management/role.rb', line 182

def name
  @name
end

#os_type ⇒ Object

Returns the value of attribute os_type.



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# File 'lib/azure/service_management/role.rb', line 186

def os_type
  @os_type
end

#os_version ⇒ Object

Returns the value of attribute os_version.



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# File 'lib/azure/service_management/role.rb', line 186

def os_version
  @os_version
end

#publicipaddress ⇒ Object

Returns the value of attribute publicipaddress.



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# File 'lib/azure/service_management/role.rb', line 182

def publicipaddress
  @publicipaddress
end

#role_xml ⇒ Object

Returns the value of attribute role_xml.



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# File 'lib/azure/service_management/role.rb', line 186

def role_xml
  @role_xml
end

#size ⇒ Object

Returns the value of attribute size.



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# File 'lib/azure/service_management/role.rb', line 182

def size
  @size
end

#sshport ⇒ Object

Returns the value of attribute sshport.



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# File 'lib/azure/service_management/role.rb', line 183

def sshport
  @sshport
end

#status ⇒ Object

Returns the value of attribute status.



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# File 'lib/azure/service_management/role.rb', line 182

def status
  @status
end

#tcpports ⇒ Object

Returns the value of attribute tcpports.



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# File 'lib/azure/service_management/role.rb', line 185

def tcpports
  @tcpports
end

#thumbprint ⇒ Object

Returns the value of attribute thumbprint.



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# File 'lib/azure/service_management/role.rb', line 183

def thumbprint
  @thumbprint
end

#udpports ⇒ Object

Returns the value of attribute udpports.



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# File 'lib/azure/service_management/role.rb', line 185

def udpports
  @udpports
end

#winrmport ⇒ Object

Returns the value of attribute winrmport.



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# File 'lib/azure/service_management/role.rb', line 184

def winrmport
  @winrmport
end

Instance Method Details

#add_endpoints_to_xml(xml, endpoints, params) ⇒ Object 



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# File 'lib/azure/service_management/role.rb', line 279

def add_endpoints_to_xml(xml, endpoints, params)
  existing_endpoints = find_deploy(params).input_endpoints

  endpoints.each do |ep|
    if existing_endpoints
      existing_endpoints.each do |eep|
        ep = eep if eep["LoadBalancedEndpointSetName"] && ep["LoadBalancedEndpointSetName"] && (eep["LoadBalancedEndpointSetName"] == ep["LoadBalancedEndpointSetName"])
      end
    end

    if ep["Port"] == params[:port] && ep["Protocol"].casecmp("tcp").zero?
      puts("Skipping tcp-endpoints: #{ep["LocalPort"]} because this port is already in use by ssh/winrm endpoint in current VM.")
      next
    end

    xml.InputEndpoint do
      xml.LoadBalancedEndpointSetName ep["LoadBalancedEndpointSetName"] if ep["LoadBalancedEndpointSetName"]
      xml.LocalPort ep["LocalPort"]
      xml.Name ep["Name"]
      xml.Port ep["Port"]
      if ep["LoadBalancerProbe"]
        xml.LoadBalancerProbe do
          xml.Path ep["LoadBalancerProbe"]["Path"] if ep["LoadBalancerProbe"]["Path"]
          xml.Port ep["LoadBalancerProbe"]["Port"]
          xml.Protocol ep["LoadBalancerProbe"]["Protocol"]
          xml.IntervalInSeconds ep["LoadBalancerProbe"]["IntervalInSeconds"] if ep["LoadBalancerProbe"]["IntervalInSeconds"]
          xml.TimeoutInSeconds ep["LoadBalancerProbe"]["TimeoutInSeconds"] if ep["LoadBalancerProbe"]["TimeoutInSeconds"]
        end
      end
      xml.Protocol ep["Protocol"]
      xml.EnableDirectServerReturn ep["EnableDirectServerReturn"] if ep["EnableDirectServerReturn"]
      xml.LoadBalancerName ep["LoadBalancerName"] if ep["LoadBalancerName"]
      xml.IdleTimeoutInMinutes ep["IdleTimeoutInMinutes"] if ep["IdleTimeoutInMinutes"]
    end
  end
end

#create(params, roleXML) ⇒ Object 



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# File 'lib/azure/service_management/role.rb', line 558

def create(params, roleXML)
  servicecall = "hostedservices/#{params[:azure_dns_name]}/deployments" \
                "/#{params["deploy_name"]}/roles"
  @connection.query_azure(servicecall, "post", roleXML.to_xml)
end

#fetch_thumbprint ⇒ Object 



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# File 'lib/azure/service_management/role.rb', line 316

def fetch_thumbprint
  query_result = connection.query_azure("hostedservices/#{@hostedservicename}/deployments/#{@hostedservicename}/roles/#{@name}")
  query_result.at_css("DefaultWinRmCertificateThumbprint").nil? ? "" : query_result.at_css("DefaultWinRmCertificateThumbprint").text
end

#find_deploy(params) ⇒ Object 



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# File 'lib/azure/service_management/role.rb', line 275

def find_deploy(params)
  @connection.hosts.find(params[:azure_dns_name]).deploys[0] # TODO: this relies on the 'production only' bug.
end

#parse(roleXML, hostedservicename, deployname) ⇒ Object 



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# File 'lib/azure/service_management/role.rb', line 209

def parse(roleXML, hostedservicename, deployname)
  @name = xml_content(roleXML, "RoleName")
  @status = xml_content(roleXML, "InstanceStatus")
  @size = xml_content(roleXML, "InstanceSize")
  @ipaddress = xml_content(roleXML, "IpAddress")
  @hostname = xml_content(roleXML, "HostName")
  @hostedservicename = hostedservicename
  @deployname = deployname
  @thumbprint = fetch_thumbprint
  @tcpports = []
  @udpports = []

  endpoints = roleXML.css("InstanceEndpoint")
  @publicipaddress = xml_content(endpoints[0], "Vip") unless endpoints.empty?
  endpoints.each do |endpoint|
    if xml_content(endpoint, "Name").casecmp("ssh").zero?
      @sshport = xml_content(endpoint, "PublicPort")
    elsif xml_content(endpoint, "Name").casecmp("winrm").zero?
      @winrmport = xml_content(endpoint, "PublicPort")
    else
      hash = {}
      hash["Name"] = xml_content(endpoint, "Name")
      hash["Vip"] = xml_content(endpoint, "Vip")
      hash["PublicPort"] = xml_content(endpoint, "PublicPort")
      hash["LocalPort"] = xml_content(endpoint, "LocalPort")

      if xml_content(endpoint, "Protocol") == "tcp"
        @tcpports << hash
      else # == 'udp'
        @udpports << hash
      end
    end
  end
end

#parse_endpoint_from_params(protocol, _azure_vm_name, endpoint_param_string) ⇒ Object

Expects endpoint_param_string to be in the form localport:publicport:lb_set_name:lb_probe_path Only localport is mandatory.



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# File 'lib/azure/service_management/role.rb', line 253

def parse_endpoint_from_params(protocol, _azure_vm_name, endpoint_param_string)
  fields = endpoint_param_string.split(":").map(&:strip)
  hash = {}
  hash["LocalPort"] = fields[0]
  hash["Port"] = fields[1] || fields[0]
  hash["LoadBalancerName"] = fields[2] if fields[2] != "EXTERNAL" # TODO: hackity hack.. Shouldn't use magic words.
  hash["LoadBalancedEndpointSetName"] = fields[3]
  hash["Protocol"] = protocol
  if TCP_ENDPOINTS_MAPPING.include?(hash["Port"]) && protocol == "TCP"
    hash["Name"] = TCP_ENDPOINTS_MAPPING[hash["Port"]]
  else
    hash["Name"] = "#{protocol}Endpoint_chef_#{fields[0]}"
  end
  if fields[2]
    hash["LoadBalancerProbe"] = {}
    hash["LoadBalancerProbe"]["Path"] = fields[4]
    hash["LoadBalancerProbe"]["Port"] = fields[0]
    hash["LoadBalancerProbe"]["Protocol"] = fields[4] ? "HTTP" : protocol
  end
  hash
end

#parse_role_list_xml(roleListXML) ⇒ Object 



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# File 'lib/azure/service_management/role.rb', line 244

def parse_role_list_xml(roleListXML)
  @role_xml = roleListXML
  os_disk_xml = roleListXML.css("OSVirtualHardDisk")
  @os_type = xml_content(os_disk_xml, "OS")
  @os_version = xml_content(os_disk_xml, "SourceImageName")
end

#setup(params) ⇒ Object 



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# File 'lib/azure/service_management/role.rb', line 321

def setup(params)
  azure_user_domain_name = params[:azure_user_domain_name] || params[:azure_domain_name]
  builder = Nokogiri::XML::Builder.new do |xml|
    xml.PersistentVMRole(
      "xmlns" => "http://schemas.microsoft.com/windowsazure",
      "xmlns:i" => "http://www.w3.org/2001/XMLSchema-instance"
    ) do
      xml.RoleName { xml.text params[:azure_vm_name] }
      xml.OsVersion("i:nil" => "true")
      xml.RoleType "PersistentVMRole"

      xml.ConfigurationSets do
        if params[:os_type] == "Linux"
          xml.ConfigurationSet("i:type" => "LinuxProvisioningConfigurationSet") do
            xml.ConfigurationSetType "LinuxProvisioningConfiguration"
            xml.HostName params[:azure_vm_name]
            xml.UserName params[:connection_user]
            if params[:ssh_identity_file].nil?
              xml.UserPassword params[:connection_password]
              xml.DisableSshPasswordAuthentication "false"
            else
              xml.DisableSshPasswordAuthentication "true"
              xml.SSH do
                xml.PublicKeys do
                  xml.PublicKey do
                    xml.Fingerprint params[:fingerprint].to_s.upcase
                    xml.Path "/home/" + params[:connection_user] + "/.ssh/authorized_keys"
                  end
                end
              end
            end
          end
        elsif params[:os_type] == "Windows"
          xml.ConfigurationSet("i:type" => "WindowsProvisioningConfigurationSet") do
            xml.ConfigurationSetType "WindowsProvisioningConfiguration"
            xml.ComputerName params[:azure_vm_name]
            xml.AdminPassword params[:admin_password]
            xml.ResetPasswordOnFirstLogon "false"
            xml.EnableAutomaticUpdates "false"
            if params[:azure_domain_name]
              xml.DomainJoin do
                xml.Credentials do
                  xml.Domain azure_user_domain_name
                  xml.Username params[:azure_domain_user]
                  xml.Password params[:azure_domain_passwd]
                end
                xml.JoinDomain params[:azure_domain_name]
                xml.MachineObjectOU params[:azure_domain_ou_dn] if params[:azure_domain_ou_dn]
              end
            end
            if params[:connection_protocol].casecmp("winrm").zero?
              if params[:ssl_cert_fingerprint]
                xml.StoredCertificateSettings do
                  xml.CertificateSetting do
                    xml.StoreLocation "LocalMachine"
                    xml.StoreName "My"
                    xml.Thumbprint params[:ssl_cert_fingerprint]
                  end
                end
              end
              xml.WinRM do
                xml.Listeners do
                  if params[:winrm_ssl] || params[:ssl_cert_fingerprint]
                    xml.Listener do
                      xml.CertificateThumbprint params[:ssl_cert_fingerprint] if params[:ssl_cert_fingerprint]
                      xml.Protocol "Https"
                    end
                  else
                    xml.Listener do
                      xml.Protocol "Http"
                    end
                   end
                end
              end
            end
            xml.AdminUsername params[:connection_user]
            if params[:connection_protocol].casecmp("winrm").zero? && (params[:winrm_max_timeout] || params[:winrm_max_memory_per_shell])
              xml.AdditionalUnattendContent do
                xml.Passes do
                  xml.UnattendPass do
                    xml.PassName "oobeSystem"
                    xml.Components do
                      xml.UnattendComponent do
                        xml.ComponentName "Microsoft-Windows-Shell-Setup"
                        xml.ComponentSettings do
                          xml.ComponentSetting do
                            xml.SettingName "AutoLogon"
                            xml.Content Base64.encode64(
                              Nokogiri::XML::Builder.new do |auto_logon_xml|
                                auto_logon_xml.AutoLogon do
                                  auto_logon_xml.Username params[:connection_user]
                                  auto_logon_xml.Password do
                                    auto_logon_xml.Value params[:admin_password]
                                    auto_logon_xml.PlainText true
                                  end
                                  auto_logon_xml.LogonCount 1
                                  auto_logon_xml.Enabled true
                                end
                              end.to_xml(save_with: Nokogiri::XML::Node::SaveOptions::NO_DECLARATION)
                            ).strip
                          end
                          xml.ComponentSetting do
                            xml.SettingName "FirstLogonCommands"
                            xml.Content Base64.encode64(
                              Nokogiri::XML::Builder.new do |first_logon_xml|
                                first_logon_xml.FirstLogonCommands do
                                  if params[:winrm_max_timeout]
                                    first_logon_xml.SynchronousCommand("wcm:action" => "add") do
                                      first_logon_xml.Order 1
                                      first_logon_xml.CommandLine "cmd.exe /c winrm set winrm/config @{MaxTimeoutms=\"#{params[:winrm_max_timeout]}\"}"
                                      first_logon_xml.Description "Bump WinRM max timeout to #{params[:winrm_max_timeout]} milliseconds"
                                    end
                                  end

                                  if params[:winrm_max_memory_per_shell]
                                    first_logon_xml.SynchronousCommand("wcm:action" => "add") do
                                      first_logon_xml.Order 2
                                      first_logon_xml.CommandLine "cmd.exe /c winrm set winrm/config/winrs @{MaxMemoryPerShellMB=\"#{params[:winrm_max_memory_per_shell]}\"}"
                                      first_logon_xml.Description "Bump WinRM max memory per shell to #{params[:winrm_max_memory_per_shell]} MB"
                                    end
                                  end
                                end
                              end.to_xml(save_with: Nokogiri::XML::Node::SaveOptions::NO_DECLARATION)
                            ).strip
                          end
                        end
                      end
                    end
                  end
                end
              end
            end
          end
        end

        xml.ConfigurationSet("i:type" => "NetworkConfigurationSet") do
          xml.ConfigurationSetType "NetworkConfiguration"
          xml.InputEndpoints do
            # 1. connection_protocol = 'winrm' for windows => Set winrm port
            # 2. connection_protocol = 'ssh' for windows and linux => Set ssh port
            # 3. connection_protocol = 'cloud-api' for windows and linux => Set no port
            if (params[:os_type] == "Windows") && params[:connection_protocol].casecmp("winrm").zero?
              xml.InputEndpoint do
                if params[:winrm_ssl]
                  xml.LocalPort "5986"
                else
                  xml.LocalPort "5985"
                end
                xml.Name "WinRM"
                xml.Port params[:port]
                xml.Protocol "TCP"
              end
            elsif params[:connection_protocol].casecmp("ssh").zero?
              xml.InputEndpoint do
                xml.LocalPort "22"
                xml.Name "SSH"
                xml.Port params[:port]
                xml.Protocol "TCP"
              end
            end
            all_endpoints = []

            if params[:tcp_endpoints]
              params[:tcp_endpoints].split(",").map(&:strip).each do |endpoint|
                all_endpoints << parse_endpoint_from_params("TCP", params[:azure_vm_name], endpoint)
              end
            end
            if params[:udp_endpoints]
              params[:udp_endpoints].split(",").map(&:strip).each do |endpoint|
                all_endpoints << parse_endpoint_from_params("UDP", params[:azure_vm_name], endpoint)
              end
            end
            add_endpoints_to_xml(xml, all_endpoints, params) if all_endpoints.any?
          end
          if params[:azure_subnet_name]
            xml.SubnetNames do
              xml.SubnetName params[:azure_subnet_name]
            end
          end
        end
      end

      # Azure resource extension support
      if params[:connection_protocol] == "cloud-api"
        xml.ResourceExtensionReferences do
          xml.ResourceExtensionReference do
            xml.ReferenceName params[:chef_extension]
            xml.Publisher params[:chef_extension_publisher]
            xml.Name params[:chef_extension]
            xml.Version params[:chef_extension_version]
            xml.ResourceExtensionParameterValues do
              if params[:chef_extension_public_param]
                xml.ResourceExtensionParameterValue do
                  xml.Key "PublicParams"
                  xml.Value Base64.encode64(params[:chef_extension_public_param].to_json)
                  xml.Type "Public"
                end
              end
              if params[:chef_extension_private_param]
                xml.ResourceExtensionParameterValue do
                  xml.Key "PrivateParams"
                  xml.Value Base64.encode64(params[:chef_extension_private_param].to_json)
                  xml.Type "Private"
                end
              end
            end
            xml.State "Enable"
          end
        end
      end

      if params[:azure_availability_set]
        xml.AvailabilitySetName params[:azure_availability_set]
      end

      xml.VMImageName params[:azure_source_image] if params[:is_vm_image]

      xml.Label Base64.encode64(params[:azure_vm_name]).strip

      # OSVirtualHardDisk not required in case azure_source_image is a VMImage
      unless params[:is_vm_image]
        xml.OSVirtualHardDisk do
          disk_name = params[:azure_os_disk_name] || "disk_" + SecureRandom.uuid
          xml.DiskName disk_name
          domain_suffix = params[:azure_api_host_name] ? params[:azure_api_host_name].scan(/core.*/)[0] : ""
          xml.MediaLink "http://" + params[:azure_storage_account] + ".blob." + domain_suffix + "/vhds/" + disk_name + ".vhd"
          xml.SourceImageName params[:azure_source_image]
        end
      end

      xml.RoleSize params[:azure_vm_size]
      xml.ProvisionGuestAgent true if params[:connection_protocol] == "cloud-api"
    end
  end
  builder.doc
end

#setup_extension(params) ⇒ Object 



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# File 'lib/azure/service_management/role.rb', line 564

def setup_extension(params)
  ## add Chef Extension config in role_xml retrieved from the server
  puts "Adding Chef Extension config in server role..."
  role_xml = update_role_xml_for_extension(params[:role_xml], params)

  ## role_xml can't be used for update as it has additional tags like
  ## role_name, osversion etc. which update API does not support, also the
  ## xml is the child of parent node 'Deployment' in XML, so instead of
  ## modifying the role_xml to fit for our requirements, we create
  ## new XML (with Chef Extension config and other pre-existing VM config)
  ## using the required values of the updated role_xml
  builder = Nokogiri::XML::Builder.new do |xml|
    xml.PersistentVMRole(
      "xmlns" => "http://schemas.microsoft.com/windowsazure",
      "xmlns:i" => "http://www.w3.org/2001/XMLSchema-instance"
    ) do
      xml.ConfigurationSets role_xml.at_css("ConfigurationSets").children unless role_xml.at_css("ConfigurationSets").nil?
      xml.ResourceExtensionReferences role_xml.at_css("ResourceExtensionReferences").children unless role_xml.at_css("ResourceExtensionReferences").nil?
      xml.AvailabilitySetName role_xml.at_css("AvailabilitySetName").children unless role_xml.at_css("AvailabilitySetName").nil?
      xml.DataVirtualHardDisks role_xml.at_css("DataVirtualHardDisks").children unless role_xml.at_css("DataVirtualHardDisks").nil?
      xml.OSVirtualHardDisk role_xml.at_css("OSVirtualHardDisk").children unless role_xml.at_css("OSVirtualHardDisk").nil?
      xml.RoleSize role_xml.at_css("RoleSize").children unless role_xml.at_css("RoleSize").nil?
      xml.ProvisionGuestAgent role_xml.at_css("ProvisionGuestAgent").children unless role_xml.at_css("ProvisionGuestAgent").nil?
    end
  end

  builder.doc.to_xml.gsub("&lt\;", "<").gsub("&gt\;", ">")
end

#update(name, params, roleXML) ⇒ Object 



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# File 'lib/azure/service_management/role.rb', line 705

def update(name, params, roleXML)
  puts "Updating server role..."
  servicecall = "hostedservices/#{params[:azure_dns_name]}" \
                "/deployments/#{params[:deploy_name]}/roles/#{name}"
  ret_val = @connection.query_azure(servicecall, "put", roleXML, "", true, true, "application/xml")
  error_code, error_message = error_from_response_xml(ret_val)
  unless error_code.empty?
    Chef::Log.debug(ret_val.to_s)
    raise "Unable to update role:" + error_code + " : " + error_message
  end
end

#update_role_xml_for_extension(roleXML, params) ⇒ Object 



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# File 'lib/azure/service_management/role.rb', line 593

def update_role_xml_for_extension(roleXML, params)
  ## check if 'ResourceExtensionReferences' node already exist in the XML,
  ## if no add it, else retrieve the object of the existing node
  add_resource_extension_references = roleXML.at_css("ResourceExtensionReferences").nil?

  if add_resource_extension_references
    resource_extension_references = Nokogiri::XML::Node.new("ResourceExtensionReferences", roleXML)
  else
    resource_extension_references = roleXML.css("ResourceExtensionReferences")
  end

  ## check if Azure Chef Extension is already installed on the given server,
  ## if no than install it, else raise error saying that the extension is
  ## already installed
  ext = nil
  unless add_resource_extension_references
    unless resource_extension_references.at_css("ReferenceName").nil?
      resource_extension_references.css("ReferenceName").each { |node| ext = node if node.content == params[:chef_extension] }
    end
  end

  add_resource_extension_reference = ext.nil?

  ## create Azure Chef Extension config and add it in the role_xml
  if add_resource_extension_reference
    resource_extension_reference = Nokogiri::XML::Node.new("ResourceExtensionReference", roleXML)

    reference_name = Nokogiri::XML::Node.new("ReferenceName", roleXML)
    reference_name.content = params[:chef_extension]
    resource_extension_reference.add_child(reference_name)

    publisher = Nokogiri::XML::Node.new("Publisher", roleXML)
    publisher.content = params[:chef_extension_publisher]
    resource_extension_reference.add_child(publisher)

    name = Nokogiri::XML::Node.new("Name", roleXML)
    name.content = params[:chef_extension]
    resource_extension_reference.add_child(name)

    version = Nokogiri::XML::Node.new("Version", roleXML)
    version.content = params[:chef_extension_version]
    resource_extension_reference.add_child(version)

    resource_extension_parameter_values = Nokogiri::XML::Node.new("ResourceExtensionParameterValues", roleXML)
    if params[:chef_extension_public_param]
      resource_extension_parameter_value = Nokogiri::XML::Node.new("ResourceExtensionParameterValue", roleXML)

      key = Nokogiri::XML::Node.new("Key", roleXML)
      key.content = "PublicParams"
      resource_extension_parameter_value.add_child(key)

      value = Nokogiri::XML::Node.new("Value", roleXML)
      value.content = Base64.encode64(params[:chef_extension_public_param].to_json)
      resource_extension_parameter_value.add_child(value)

      type = Nokogiri::XML::Node.new("Type", roleXML)
      type.content = "Public"
      resource_extension_parameter_value.add_child(type)

      resource_extension_parameter_values.add_child(resource_extension_parameter_value)
    end

    if params[:chef_extension_private_param]
      resource_extension_parameter_value = Nokogiri::XML::Node.new("ResourceExtensionParameterValue", roleXML)

      key = Nokogiri::XML::Node.new("Key", roleXML)
      key.content = "PrivateParams"
      resource_extension_parameter_value.add_child(key)

      value = Nokogiri::XML::Node.new("Value", roleXML)
      value.content = Base64.encode64(params[:chef_extension_private_param].to_json)
      resource_extension_parameter_value.add_child(value)

      type = Nokogiri::XML::Node.new("Type", roleXML)
      type.content = "Private"
      resource_extension_parameter_value.add_child(type)

      resource_extension_parameter_values.add_child(resource_extension_parameter_value)
    end

    resource_extension_reference.add_child(resource_extension_parameter_values)

    state = Nokogiri::XML::Node.new("State", roleXML)
    state.content = "enable"
    resource_extension_reference.add_child(state)

    if add_resource_extension_references
      resource_extension_references.add_child(resource_extension_reference)
    else
      resource_extension_references.last.add_child(resource_extension_reference)
    end

    roleXML.add_child(resource_extension_references) if add_resource_extension_references

    add_provision_guest_agent = roleXML.at_css("ProvisionGuestAgent").nil?

    if add_provision_guest_agent
      provision_guest_agent = Nokogiri::XML::Node.new("ProvisionGuestAgent", roleXML)
      provision_guest_agent.content = true
    else
      provision_guest_agent = roleXML.css("ProvisionGuestAgent")
      provision_guest_agent.first.content = true
    end

    roleXML.add_child(provision_guest_agent) if add_provision_guest_agent
  else ## raise error as Chef Extension is already installed on the server
    raise "Chef Extension is already installed on the server #{params[:azure_vm_name]}."
  end

  roleXML
end