diff --git a/utils/definitionsClass.py b/utils/definitionsClass.py
new file mode 100644
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--- /dev/null
+++ b/utils/definitionsClass.py
@@ -0,0 +1,75 @@
+# -*- coding: utf-8 -*-
+
+##
+# Copyright 2015 Telefónica Investigación y Desarrollo, S.A.U.
+# This file is part of openmano
+# All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact with: nfvlabs@tid.es
+##
+
+'''
+Definitions of classes for the Host operating server, ...  
+'''
+
+__author__="Pablo Montes"
+
+
+class Units():
+    memory_1000 = 1
+    memory_1024 = 2
+    memory_full = 3
+    bw = 4
+    freq = 5
+    no_units = 6
+    name = 7
+    boolean = 8
+    
+class definitionsClass():
+    user = 'n2'
+    password = 'n2'
+    extrict_hugepages_allocation = True
+    processor_possible_features = ['64b','iommu','lps','tlbps','hwsv','dioc','ht']
+    processor_possible_manufacturers = ['Intel','AMD']
+    processor_possible_families = ['Xeon']
+    processor_possible_versions = ['Intel(R) Xeon(R) CPU E5-4620 0 @ 2.20GHz', 'Intel(R) Xeon(R) CPU E5-2680 0 @ 2.70GHz','Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz']
+    memory_possible_types = ['DDR2','DDR3']
+    memory_possible_form_factors = ['DIMM']
+    hypervisor_possible_types = ['QEMU']
+    hypervisor_possible_domain_types = ['kvm'] #['qemu', 'kvm']
+    os_possible_id = ['Red Hat Enterprise Linux Server release 6.4 (Santiago)',
+                      'Red Hat Enterprise Linux Server release 6.5 (Santiago)',
+                      'Red Hat Enterprise Linux Server release 6.6 (Santiago)',
+                      'CentOS release 6.5 (Final)',
+                      'CentOS release 6.6 (Final)',
+                      'Red Hat Enterprise Linux Server release 7.0 (Maipo)',
+                      'Red Hat Enterprise Linux Server release 7.1 (Maipo)',
+                    ]
+    os_possible_types = ['GNU/Linux']
+    os_possible_architectures = ['x86_64']
+    hypervisor_possible_composed_versions = ['QEMU-kvm']
+    units = dict() 
+    units[Units.bw] = ['Gbps', 'Mbps', 'kbps', 'bps']
+    units[Units.freq] = ['GHz', 'MHz', 'KHz', 'Hz']
+    units[Units.memory_1000] = ['GB', 'MB', 'KB', 'B']
+    units[Units.memory_1024] = ['GiB', 'MiB', 'KiB', 'B']
+    units[Units.memory_full] = ['GB', 'MB', 'KB', 'GiB', 'MiB', 'KiB', 'B']
+    valid_hugepage_sz = [1073741824, 2097152] #In bytes
+    valid_VNFC_iface_types = ['mgmt','data']
+    
+    def __init__(self):
+        return
+