Refactor some common methods into utils

- generete_ping_userdata(): This method was exactly the same in two
  tests
- create_instance(): The various implementations of this method had
  almost the same signature, but not quite. This was fixed by adding
  extra arguments as needed. Also a global variable was used in the
  function, which was converted into a parameter.
- create_network(): The three implementations of create_network had
  three different signatures and returned different variables. They
  were all unified in a single create_network class and the calls to
  create_network were adjusted accordingly.

Revision 1: Fix flake8 violations
Revision 2: Rename logger in utils

Change-Id: Ib6cfe798dc561a69eb50c901e3aa71c19d465821
Signed-off-by: Romanos Skiadas <rski@intracom-telecom.com>
(cherry picked from commit 4c2e5fb06be31502ab3476f25f6d1c2ef8d7b0f1)

4 files changed, 293 insertions, 365 deletions

diff --git a/test/functest/testcase_1.py b/test/functest/testcase_1.py
index 6a252af..d37f196 100644
--- a/test/functest/testcase_1.py
+++ b/test/functest/testcase_1.py
@@ -18,6 +18,7 @@ import functest.utils.functest_logger as ft_logger
 import functest.utils.functest_utils as ft_utils
 import functest.utils.openstack_utils as os_utils
 
+import utils as test_utils
 
 parser = argparse.ArgumentParser()
 
@@ -94,77 +95,6 @@ NUM_TESTS = 0
 NUM_TESTS_FAILED = 0
 
 
-def create_network(neutron_client, net, subnet, router, cidr):
-    network_dic = os_utils.create_network_full(neutron_client,
-                                               net,
-                                               subnet,
-                                               router,
-                                               cidr)
-    if not network_dic:
-        logger.error(
-            "There has been a problem when creating the neutron network")
-        sys.exit(-1)
-    return network_dic["net_id"]
-
-
-def create_instance(nova_client,
-                    name,
-                    flavor,
-                    image_id,
-                    network_id,
-                    sg_id,
-                    compute_node='',
-                    userdata=None):
-    logger.info("Creating instance '%s'..." % name)
-    logger.debug(
-        "Configuration:\n name=%s \n flavor=%s \n image=%s \n "
-        "network=%s \n secgroup=%s \n hypervisor=%s \n userdata=%s\n"
-        % (name, flavor, image_id, network_id, sg_id, compute_node, userdata))
-    instance = os_utils.create_instance_and_wait_for_active(
-        flavor,
-        image_id,
-        network_id,
-        name,
-        config_drive=True,
-        userdata=userdata,
-        av_zone=compute_node)
-
-    if instance is None:
-        logger.error("Error while booting instance.")
-        sys.exit(-1)
-    # Retrieve IP of INSTANCE
-    # instance_ip = instance.networks.get(network_id)[0]
-
-    logger.debug("Adding '%s' to security group '%s'..."
-                 % (name, SECGROUP_NAME))
-    os_utils.add_secgroup_to_instance(nova_client, instance.id, sg_id)
-
-    return instance
-
-
-def generate_ping_userdata(ips_array):
-    ips = ""
-    for ip in ips_array:
-        ips = ("%s %s" % (ips, ip))
-
-    ips = ips.replace('  ', ' ')
-    return ("#!/bin/sh\n"
-            "set%s\n"
-            "while true; do\n"
-            " for i do\n"
-            "  ip=$i\n"
-            "  ping -c 1 $ip 2>&1 >/dev/null\n"
-            "  RES=$?\n"
-            "  if [ \"Z$RES\" = \"Z0\" ] ; then\n"
-            "   echo ping $ip OK\n"
-            "  else echo ping $ip KO\n"
-            "  fi\n"
-            " done\n"
-            " sleep 1\n"
-            "done\n"
-            % ips)
-
-
 def get_ping_status(vm_source, ip_source,
                     vm_target, ip_target,
                     expected="PASS", timeout=30):
@@ -258,16 +188,16 @@ def main():
                                             disk=IMAGE_FORMAT,
                                             container="bare",
                                             public=True)
-    network_1_id = create_network(neutron_client,
-                                  NET_1_NAME,
-                                  SUBNET_1_NAME,
-                                  ROUTER_1_NAME,
-                                  SUBNET_1_CIDR)
-    network_2_id = create_network(neutron_client,
-                                  NET_2_NAME,
-                                  SUBNET_2_NAME,
-                                  ROUTER_2_NAME,
-                                  SUBNET_2_CIDR)
+    network_1_id, _, _ = test_utils.create_network(neutron_client,
+                                                   NET_1_NAME,
+                                                   SUBNET_1_NAME,
+                                                   SUBNET_1_CIDR,
+                                                   ROUTER_1_NAME)
+    network_2_id, _, _ = test_utils.create_network(neutron_client,
+                                                   NET_2_NAME,
+                                                   SUBNET_2_NAME,
+                                                   SUBNET_2_CIDR,
+                                                   ROUTER_2_NAME)
     sg_id = os_utils.create_security_group_full(neutron_client,
                                                 SECGROUP_NAME, SECGROUP_DESCR)
 
@@ -285,63 +215,71 @@ def main():
     av_zone_2 = "nova:" + compute_nodes[1]
 
     # boot INTANCES
-    vm_2 = create_instance(nova_client,
-                           INSTANCE_2_NAME,
-                           FLAVOR,
-                           image_id,
-                           network_1_id,
-                           sg_id,
-                           av_zone_1)
+    vm_2 = test_utils.create_instance(nova_client,
+                                      INSTANCE_2_NAME,
+                                      FLAVOR,
+                                      image_id,
+                                      network_1_id,
+                                      sg_id,
+                                      secgroup_name=SECGROUP_NAME,
+                                      compute_node=av_zone_1)
     vm_2_ip = vm_2.networks.itervalues().next()[0]
     logger.debug("Instance '%s' booted successfully. IP='%s'." %
                  (INSTANCE_2_NAME, vm_2_ip))
 
-    vm_3 = create_instance(nova_client,
-                           INSTANCE_3_NAME,
-                           FLAVOR, image_id,
-                           network_1_id,
-                           sg_id,
-                           av_zone_2)
+    vm_3 = test_utils.create_instance(nova_client,
+                                      INSTANCE_3_NAME,
+                                      FLAVOR, image_id,
+                                      network_1_id,
+                                      sg_id,
+                                      secgroup_name=SECGROUP_NAME,
+                                      compute_node=av_zone_2)
     vm_3_ip = vm_3.networks.itervalues().next()[0]
     logger.debug("Instance '%s' booted successfully. IP='%s'." %
                  (INSTANCE_3_NAME, vm_3_ip))
 
-    vm_5 = create_instance(nova_client,
-                           INSTANCE_5_NAME,
-                           FLAVOR,
-                           image_id,
-                           network_2_id,
-                           sg_id,
-                           av_zone_2)
+    vm_5 = test_utils.create_instance(nova_client,
+                                      INSTANCE_5_NAME,
+                                      FLAVOR,
+                                      image_id,
+                                      network_2_id,
+                                      sg_id,
+                                      secgroup_name=SECGROUP_NAME,
+                                      compute_node=av_zone_2)
     vm_5_ip = vm_5.networks.itervalues().next()[0]
     logger.debug("Instance '%s' booted successfully. IP='%s'." %
                  (INSTANCE_5_NAME, vm_5_ip))
 
     # We boot vm5 first because we need vm5_ip for vm4 userdata
-    u4 = generate_ping_userdata([vm_5_ip])
-    vm_4 = create_instance(nova_client,
-                           INSTANCE_4_NAME,
-                           FLAVOR,
-                           image_id,
-                           network_2_id,
-                           sg_id,
-                           av_zone_1,
-                           userdata=u4)
+    u4 = test_utils.generate_ping_userdata([vm_5_ip])
+    vm_4 = test_utils.create_instance(nova_client,
+                                      INSTANCE_4_NAME,
+                                      FLAVOR,
+                                      image_id,
+                                      network_2_id,
+                                      sg_id,
+                                      secgroup_name=SECGROUP_NAME,
+                                      compute_node=av_zone_1,
+                                      userdata=u4)
     vm_4_ip = vm_4.networks.itervalues().next()[0]
     logger.debug("Instance '%s' booted successfully. IP='%s'." %
                  (INSTANCE_4_NAME, vm_4_ip))
 
     # We boot VM1 at the end because we need to get the IPs first to generate
     # the userdata
-    u1 = generate_ping_userdata([vm_2_ip, vm_3_ip, vm_4_ip, vm_5_ip])
-    vm_1 = create_instance(nova_client,
-                           INSTANCE_1_NAME,
-                           FLAVOR,
-                           image_id,
-                           network_1_id,
-                           sg_id,
-                           av_zone_1,
-                           userdata=u1)
+    u1 = test_utils.generate_ping_userdata([vm_2_ip,
+                                            vm_3_ip,
+                                            vm_4_ip,
+                                            vm_5_ip])
+    vm_1 = test_utils.create_instance(nova_client,
+                                      INSTANCE_1_NAME,
+                                      FLAVOR,
+                                      image_id,
+                                      network_1_id,
+                                      sg_id,
+                                      secgroup_name=SECGROUP_NAME,
+                                      compute_node=av_zone_1,
+                                      userdata=u1)
     vm_1_ip = vm_1.networks.itervalues().next()[0]
     logger.debug("Instance '%s' booted successfully. IP='%s'." %
                  (INSTANCE_1_NAME, vm_1_ip))
diff --git a/test/functest/testcase_2.py b/test/functest/testcase_2.py
index e319333..f5e5097 100644
--- a/test/functest/testcase_2.py
+++ b/test/functest/testcase_2.py
@@ -18,6 +18,7 @@ import functest.utils.functest_logger as ft_logger
 import functest.utils.functest_utils as ft_utils
 import functest.utils.openstack_utils as os_utils
 
+import utils as test_utils
 
 parser = argparse.ArgumentParser()
 
@@ -111,71 +112,6 @@ NUM_TESTS = 0
 NUM_TESTS_FAILED = 0
 
 
-def create_network(neutron_client, net, subnet1, cidr1,
-                   router, subnet2=None, cidr2=None):
-    network_dic = os_utils.create_network_full(neutron_client,
-                                               net,
-                                               subnet1,
-                                               router,
-                                               cidr1)
-    if not network_dic:
-        logger.error(
-            "There has been a problem when creating the neutron network")
-        sys.exit(-1)
-    net_id = network_dic["net_id"]
-    if subnet2 is not None:
-        logger.debug("Creating and attaching a second subnet...")
-        subnet_id = os_utils.create_neutron_subnet(
-            neutron_client, subnet2, cidr2, net_id)
-        if not subnet_id:
-            logger.error(
-                "There has been a problem when creating the second subnet")
-            sys.exit(-1)
-        logger.debug("Subnet '%s' created successfully" % subnet_id)
-    return net_id
-
-
-def create_instance(nova_client,
-                    name,
-                    flavor,
-                    image_id,
-                    network_id,
-                    sg_id,
-                    fixed_ip,
-                    compute_node='',
-                    userdata=None,
-                    files=None):
-    logger.info("Creating instance '%s'..." % name)
-    logger.debug(
-        "Configuration:\n name=%s \n flavor=%s \n image=%s \n"
-        " network=%s\n secgroup=%s \n hypervisor=%s \n"
-        " fixed_ip=%s\n files=%s\n userdata=\n%s\n"
-        % (name, flavor, image_id, network_id, sg_id,
-           compute_node, fixed_ip, files, userdata))
-    instance = os_utils.create_instance_and_wait_for_active(
-        flavor,
-        image_id,
-        network_id,
-        name,
-        config_drive=True,
-        userdata=userdata,
-        av_zone=compute_node,
-        fixed_ip=fixed_ip,
-        files=files)
-
-    if instance is None:
-        logger.error("Error while booting instance.")
-        sys.exit(-1)
-    # Retrieve IP of INSTANCE
-    # instance_ip = instance.networks.get(network_id)[0]
-
-    logger.debug("Adding '%s' to security group '%s'..."
-                 % (name, SECGROUP_NAME))
-    os_utils.add_secgroup_to_instance(nova_client, instance.id, sg_id)
-
-    return instance
-
-
 def generate_userdata_common():
     return ("#!/bin/sh\n"
             "sudo mkdir -p /home/cirros/.ssh/\n"
@@ -305,20 +241,20 @@ def main():
                                             disk=IMAGE_FORMAT,
                                             container="bare",
                                             public=True)
-    network_1_id = create_network(neutron_client,
-                                  NET_1_NAME,
-                                  SUBNET_1a_NAME,
-                                  SUBNET_1a_CIDR,
-                                  ROUTER_1_NAME,
-                                  SUBNET_1b_NAME,
-                                  SUBNET_1b_CIDR)
-    network_2_id = create_network(neutron_client,
-                                  NET_2_NAME,
-                                  SUBNET_2a_NAME,
-                                  SUBNET_2a_CIDR,
-                                  ROUTER_2_NAME,
-                                  SUBNET_2b_NAME,
-                                  SUBNET_2b_CIDR)
+    network_1_id, _, _ = test_utils.create_network(neutron_client,
+                                                   NET_1_NAME,
+                                                   SUBNET_1a_NAME,
+                                                   SUBNET_1a_CIDR,
+                                                   ROUTER_1_NAME,
+                                                   SUBNET_1b_NAME,
+                                                   SUBNET_1b_CIDR)
+    network_2_id, _, _ = test_utils.create_network(neutron_client,
+                                                   NET_2_NAME,
+                                                   SUBNET_2a_NAME,
+                                                   SUBNET_2a_CIDR,
+                                                   ROUTER_2_NAME,
+                                                   SUBNET_2b_NAME,
+                                                   SUBNET_2b_CIDR)
     sg_id = os_utils.create_security_group_full(neutron_client,
                                                 SECGROUP_NAME, SECGROUP_DESCR)
 
@@ -337,40 +273,43 @@ def main():
 
     # boot INTANCES
     userdata_common = generate_userdata_common()
-    vm_2 = create_instance(nova_client,
-                           INSTANCE_2_NAME,
-                           FLAVOR,
-                           image_id,
-                           network_1_id,
-                           sg_id,
-                           INSTANCE_2_IP,
-                           compute_node=av_zone_1,
-                           userdata=userdata_common)
+    vm_2 = test_utils.create_instance(nova_client,
+                                      INSTANCE_2_NAME,
+                                      FLAVOR,
+                                      image_id,
+                                      network_1_id,
+                                      sg_id,
+                                      fixed_ip=INSTANCE_2_IP,
+                                      secgroup_name=SECGROUP_NAME,
+                                      compute_node=av_zone_1,
+                                      userdata=userdata_common)
     vm_2_ip = vm_2.networks.itervalues().next()[0]
     logger.debug("Instance '%s' booted successfully. IP='%s'." %
                  (INSTANCE_2_NAME, vm_2_ip))
 
-    vm_3 = create_instance(nova_client,
-                           INSTANCE_3_NAME,
-                           FLAVOR, image_id,
-                           network_1_id,
-                           sg_id,
-                           INSTANCE_3_IP,
-                           compute_node=av_zone_2,
-                           userdata=userdata_common)
+    vm_3 = test_utils.create_instance(nova_client,
+                                      INSTANCE_3_NAME,
+                                      FLAVOR, image_id,
+                                      network_1_id,
+                                      sg_id,
+                                      fixed_ip=INSTANCE_3_IP,
+                                      secgroup_name=SECGROUP_NAME,
+                                      compute_node=av_zone_2,
+                                      userdata=userdata_common)
     vm_3_ip = vm_3.networks.itervalues().next()[0]
     logger.debug("Instance '%s' booted successfully. IP='%s'." %
                  (INSTANCE_3_NAME, vm_3_ip))
 
-    vm_5 = create_instance(nova_client,
-                           INSTANCE_5_NAME,
-                           FLAVOR,
-                           image_id,
-                           network_2_id,
-                           sg_id,
-                           fixed_ip=INSTANCE_5_IP,
-                           compute_node=av_zone_2,
-                           userdata=userdata_common)
+    vm_5 = test_utils.create_instance(nova_client,
+                                      INSTANCE_5_NAME,
+                                      FLAVOR,
+                                      image_id,
+                                      network_2_id,
+                                      sg_id,
+                                      fixed_ip=INSTANCE_5_IP,
+                                      secgroup_name=SECGROUP_NAME,
+                                      compute_node=av_zone_2,
+                                      userdata=userdata_common)
     vm_5_ip = vm_5.networks.itervalues().next()[0]
     logger.debug("Instance '%s' booted successfully. IP='%s'." %
                  (INSTANCE_5_NAME, vm_5_ip))
@@ -378,16 +317,17 @@ def main():
     # We boot vm5 first because we need vm5_ip for vm4 userdata
     u4 = generate_userdata_with_ssh(
         [INSTANCE_1_IP, INSTANCE_3_IP, INSTANCE_5_IP])
-    vm_4 = create_instance(nova_client,
-                           INSTANCE_4_NAME,
-                           FLAVOR,
-                           image_id,
-                           network_2_id,
-                           sg_id,
-                           fixed_ip=INSTANCE_4_IP,
-                           compute_node=av_zone_1,
-                           userdata=u4,
-                           files=files)
+    vm_4 = test_utils.create_instance(nova_client,
+                                      INSTANCE_4_NAME,
+                                      FLAVOR,
+                                      image_id,
+                                      network_2_id,
+                                      sg_id,
+                                      fixed_ip=INSTANCE_4_IP,
+                                      secgroup_name=SECGROUP_NAME,
+                                      compute_node=av_zone_1,
+                                      userdata=u4,
+                                      files=files)
     vm_4_ip = vm_4.networks.itervalues().next()[0]
     logger.debug("Instance '%s' booted successfully. IP='%s'." %
                  (INSTANCE_4_NAME, vm_4_ip))
@@ -396,16 +336,17 @@ def main():
     # the userdata
     u1 = generate_userdata_with_ssh(
         [INSTANCE_2_IP, INSTANCE_3_IP, INSTANCE_4_IP, INSTANCE_5_IP])
-    vm_1 = create_instance(nova_client,
-                           INSTANCE_1_NAME,
-                           FLAVOR,
-                           image_id,
-                           network_1_id,
-                           sg_id,
-                           fixed_ip=INSTANCE_1_IP,
-                           compute_node=av_zone_1,
-                           userdata=u1,
-                           files=files)
+    vm_1 = test_utils.create_instance(nova_client,
+                                      INSTANCE_1_NAME,
+                                      FLAVOR,
+                                      image_id,
+                                      network_1_id,
+                                      sg_id,
+                                      fixed_ip=INSTANCE_1_IP,
+                                      secgroup_name=SECGROUP_NAME,
+                                      compute_node=av_zone_1,
+                                      userdata=u1,
+                                      files=files)
     vm_1_ip = vm_1.networks.itervalues().next()[0]
     logger.debug("Instance '%s' booted successfully. IP='%s'." %
                  (INSTANCE_1_NAME, vm_1_ip))
diff --git a/test/functest/testcase_4.py b/test/functest/testcase_4.py
index c7d222e..cc4237c 100644
--- a/test/functest/testcase_4.py
+++ b/test/functest/testcase_4.py
@@ -18,6 +18,7 @@ import functest.utils.functest_logger as ft_logger
 import functest.utils.functest_utils as ft_utils
 import functest.utils.openstack_utils as os_utils
 
+import utils as test_utils
 
 parser = argparse.ArgumentParser()
 
@@ -94,79 +95,6 @@ NUM_TESTS = 0
 NUM_TESTS_FAILED = 0
 
 
-def create_network(neutron_client, net, subnet, router, cidr):
-    network_dic = os_utils.create_network_full(neutron_client,
-                                               net,
-                                               subnet,
-                                               router,
-                                               cidr)
-    if not network_dic:
-        logger.error(
-            "There has been a problem when creating the neutron network")
-        sys.exit(-1)
-    return network_dic["net_id"], \
-        network_dic["subnet_id"], \
-        network_dic["router_id"]
-
-
-def create_instance(nova_client,
-                    name,
-                    flavor,
-                    image_id,
-                    network_id,
-                    sg_id,
-                    compute_node='',
-                    userdata=None):
-    logger.info("Creating instance '%s'..." % name)
-    logger.debug(
-        "Configuration:\n name=%s \n flavor=%s \n image=%s \n "
-        "network=%s \n secgroup=%s \n hypervisor=%s \n userdata=%s\n"
-        % (name, flavor, image_id, network_id, sg_id, compute_node, userdata))
-    instance = os_utils.create_instance_and_wait_for_active(
-        flavor,
-        image_id,
-        network_id,
-        name,
-        config_drive=True,
-        userdata=userdata,
-        av_zone=compute_node)
-
-    if instance is None:
-        logger.error("Error while booting instance.")
-        sys.exit(-1)
-    # Retrieve IP of INSTANCE
-    # instance_ip = instance.networks.get(network_id)[0]
-
-    logger.debug("Adding '%s' to security group '%s'..."
-                 % (name, SECGROUP_NAME))
-    os_utils.add_secgroup_to_instance(nova_client, instance.id, sg_id)
-
-    return instance
-
-
-def generate_ping_userdata(ips_array):
-    ips = ""
-    for ip in ips_array:
-        ips = ("%s %s" % (ips, ip))
-
-    ips = ips.replace('  ', ' ')
-    return ("#!/bin/sh\n"
-            "set%s\n"
-            "while true; do\n"
-            " for i do\n"
-            "  ip=$i\n"
-            "  ping -c 1 $ip 2>&1 >/dev/null\n"
-            "  RES=$?\n"
-            "  if [ \"Z$RES\" = \"Z0\" ] ; then\n"
-            "   echo ping $ip OK\n"
-            "  else echo ping $ip KO\n"
-            "  fi\n"
-            " done\n"
-            " sleep 1\n"
-            "done\n"
-            % ips)
-
-
 def get_ping_status(vm_source, ip_source,
                     vm_target, ip_target,
                     expected="PASS", timeout=30):
@@ -260,16 +188,16 @@ def main():
                                             disk=IMAGE_FORMAT,
                                             container="bare",
                                             public=True)
-    network_1_id, _, router_1_id = create_network(neutron_client,
-                                                  NET_1_NAME,
-                                                  SUBNET_1_NAME,
-                                                  ROUTER_1_NAME,
-                                                  SUBNET_1_CIDR)
-    network_2_id, _, router_2_id = create_network(neutron_client,
-                                                  NET_2_NAME,
-                                                  SUBNET_2_NAME,
-                                                  ROUTER_2_NAME,
-                                                  SUBNET_2_CIDR)
+    network_1_id, _, router_1_id = test_utils.create_network(neutron_client,
+                                                             NET_1_NAME,
+                                                             SUBNET_1_NAME,
+                                                             SUBNET_1_CIDR,
+                                                             ROUTER_1_NAME)
+    network_2_id, _, router_2_id = test_utils.create_network(neutron_client,
+                                                             NET_2_NAME,
+                                                             SUBNET_2_NAME,
+                                                             SUBNET_2_CIDR,
+                                                             ROUTER_2_NAME)
     sg_id = os_utils.create_security_group_full(neutron_client,
                                                 SECGROUP_NAME, SECGROUP_DESCR)
 
@@ -287,63 +215,72 @@ def main():
     av_zone_2 = "nova:" + compute_nodes[1]
 
     # boot INTANCES
-    vm_2 = create_instance(nova_client,
-                           INSTANCE_2_NAME,
-                           FLAVOR,
-                           image_id,
-                           network_1_id,
-                           sg_id,
-                           av_zone_1)
+    vm_2 = test_utils.create_instance(nova_client,
+                                      INSTANCE_2_NAME,
+                                      FLAVOR,
+                                      image_id,
+                                      network_1_id,
+                                      sg_id,
+                                      secgroup_name=SECGROUP_NAME,
+                                      compute_node=av_zone_1)
     vm_2_ip = vm_2.networks.itervalues().next()[0]
     logger.debug("Instance '%s' booted successfully. IP='%s'." %
                  (INSTANCE_2_NAME, vm_2_ip))
 
-    vm_3 = create_instance(nova_client,
-                           INSTANCE_3_NAME,
-                           FLAVOR, image_id,
-                           network_1_id,
-                           sg_id,
-                           av_zone_2)
+    vm_3 = test_utils.create_instance(nova_client,
+                                      INSTANCE_3_NAME,
+                                      FLAVOR,
+                                      image_id,
+                                      network_1_id,
+                                      sg_id,
+                                      secgroup_name=SECGROUP_NAME,
+                                      compute_node=av_zone_2)
     vm_3_ip = vm_3.networks.itervalues().next()[0]
     logger.debug("Instance '%s' booted successfully. IP='%s'." %
                  (INSTANCE_3_NAME, vm_3_ip))
 
-    vm_5 = create_instance(nova_client,
-                           INSTANCE_5_NAME,
-                           FLAVOR,
-                           image_id,
-                           network_2_id,
-                           sg_id,
-                           av_zone_2)
+    vm_5 = test_utils.create_instance(nova_client,
+                                      INSTANCE_5_NAME,
+                                      FLAVOR,
+                                      image_id,
+                                      network_2_id,
+                                      sg_id,
+                                      secgroup_name=SECGROUP_NAME,
+                                      compute_node=av_zone_2)
     vm_5_ip = vm_5.networks.itervalues().next()[0]
     logger.debug("Instance '%s' booted successfully. IP='%s'." %
                  (INSTANCE_5_NAME, vm_5_ip))
 
     # We boot vm5 first because we need vm5_ip for vm4 userdata
-    u4 = generate_ping_userdata([vm_5_ip])
-    vm_4 = create_instance(nova_client,
-                           INSTANCE_4_NAME,
-                           FLAVOR,
-                           image_id,
-                           network_2_id,
-                           sg_id,
-                           av_zone_1,
-                           userdata=u4)
+    u4 = test_utils.generate_ping_userdata([vm_5_ip])
+    vm_4 = test_utils.create_instance(nova_client,
+                                      INSTANCE_4_NAME,
+                                      FLAVOR,
+                                      image_id,
+                                      network_2_id,
+                                      sg_id,
+                                      secgroup_name=SECGROUP_NAME,
+                                      compute_node=av_zone_1,
+                                      userdata=u4)
     vm_4_ip = vm_4.networks.itervalues().next()[0]
     logger.debug("Instance '%s' booted successfully. IP='%s'." %
                  (INSTANCE_4_NAME, vm_4_ip))
 
     # We boot VM1 at the end because we need to get the IPs first to generate
     # the userdata
-    u1 = generate_ping_userdata([vm_2_ip, vm_3_ip, vm_4_ip, vm_5_ip])
-    vm_1 = create_instance(nova_client,
-                           INSTANCE_1_NAME,
-                           FLAVOR,
-                           image_id,
-                           network_1_id,
-                           sg_id,
-                           av_zone_1,
-                           userdata=u1)
+    u1 = test_utils.generate_ping_userdata([vm_2_ip,
+                                            vm_3_ip,
+                                            vm_4_ip,
+                                            vm_5_ip])
+    vm_1 = test_utils.create_instance(nova_client,
+                                      INSTANCE_1_NAME,
+                                      FLAVOR,
+                                      image_id,
+                                      network_1_id,
+                                      sg_id,
+                                      secgroup_name=SECGROUP_NAME,
+                                      compute_node=av_zone_1,
+                                      userdata=u1)
     vm_1_ip = vm_1.networks.itervalues().next()[0]
     logger.debug("Instance '%s' booted successfully. IP='%s'." %
                  (INSTANCE_1_NAME, vm_1_ip))
diff --git a/test/functest/utils.py b/test/functest/utils.py
new file mode 100644
index 0000000..4d921c8
--- /dev/null
+++ b/test/functest/utils.py
@@ -0,0 +1,112 @@
+#!/usr/bin/python
+#
+# Copyright (c) 2015 All rights reserved
+# This program and the accompanying materials
+# are made available under the terms of the Apache License, Version 2.0
+# which accompanies this distribution, and is available at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+import sys
+
+import functest.utils.functest_logger as ft_logger
+import functest.utils.openstack_utils as os_utils
+
+
+logger = ft_logger.Logger("sndvpn_test_utils").getLogger()
+
+
+def create_network(neutron_client, net, subnet1, cidr1,
+                   router, subnet2=None, cidr2=None):
+    network_dic = os_utils.create_network_full(neutron_client,
+                                               net,
+                                               subnet1,
+                                               router,
+                                               cidr1)
+    if not network_dic:
+        logger.error(
+            "There has been a problem when creating the neutron network")
+        sys.exit(-1)
+    net_id = network_dic["net_id"]
+    subnet_id = network_dic["subnet_id"]
+    router_id = network_dic["router_id"]
+
+    if subnet2 is not None:
+        logger.debug("Creating and attaching a second subnet...")
+        subnet_id = os_utils.create_neutron_subnet(
+            neutron_client, subnet2, cidr2, net_id)
+        if not subnet_id:
+            logger.error(
+                "There has been a problem when creating the second subnet")
+            sys.exit(-1)
+        logger.debug("Subnet '%s' created successfully" % subnet_id)
+    return net_id, subnet_id, router_id
+
+
+def create_instance(nova_client,
+                    name,
+                    flavor,
+                    image_id,
+                    network_id,
+                    sg_id,
+                    secgroup_name=None,
+                    fixed_ip=None,
+                    compute_node='',
+                    userdata=None,
+                    files=None):
+    logger.info("Creating instance '%s'..." % name)
+    logger.debug(
+        "Configuration:\n name=%s \n flavor=%s \n image=%s \n"
+        " network=%s\n secgroup=%s \n hypervisor=%s \n"
+        " fixed_ip=%s\n files=%s\n userdata=\n%s\n"
+        % (name, flavor, image_id, network_id, sg_id,
+           compute_node, fixed_ip, files, userdata))
+    instance = os_utils.create_instance_and_wait_for_active(
+        flavor,
+        image_id,
+        network_id,
+        name,
+        config_drive=True,
+        userdata=userdata,
+        av_zone=compute_node,
+        fixed_ip=fixed_ip,
+        files=files)
+
+    if instance is None:
+        logger.error("Error while booting instance.")
+        sys.exit(-1)
+    # Retrieve IP of INSTANCE
+    # instance_ip = instance.networks.get(network_id)[0]
+
+    if secgroup_name:
+        logger.debug("Adding '%s' to security group '%s'..."
+                     % (name, secgroup_name))
+    else:
+        logger.debug("Adding '%s' to security group '%s'..."
+                     % (name, sg_id))
+    os_utils.add_secgroup_to_instance(nova_client, instance.id, sg_id)
+
+    return instance
+
+
+def generate_ping_userdata(ips_array):
+    ips = ""
+    for ip in ips_array:
+        ips = ("%s %s" % (ips, ip))
+
+    ips = ips.replace('  ', ' ')
+    return ("#!/bin/sh\n"
+            "set%s\n"
+            "while true; do\n"
+            " for i do\n"
+            "  ip=$i\n"
+            "  ping -c 1 $ip 2>&1 >/dev/null\n"
+            "  RES=$?\n"
+            "  if [ \"Z$RES\" = \"Z0\" ] ; then\n"
+            "   echo ping $ip OK\n"
+            "  else echo ping $ip KO\n"
+            "  fi\n"
+            " done\n"
+            " sleep 1\n"
+            "done\n"
+            % ips)