APEX_USER = 'root'
 APEX_USER_STACK = 'stack'
 APEX_PKEY = '/root/.ssh/id_rsa'
-PATH = os.path.dirname(os.path.realpath(__file__))
 
 
 class KeystoneException(Exception):
                                           APEX_USER_STACK,
                                           APEX_PKEY)
     nodes = handler.get_nodes()
+    mce_bin = os.path.dirname(os.path.realpath(__file__)) + '/mce-inject_ea'
     for node in nodes:
         if node.is_compute():
             centos_release = node.run_cmd('uname -r')
                 logger.info(
                     'Mcelog will be enabled on node-{}...'.format(
                         node.get_dict()['id']))
-                node.put_file(
-                    'PATH/'
-                    + 'mce-inject_ea', 'mce-inject_ea')
+                node.put_file(mce_bin, 'mce-inject_ea')
                 node.run_cmd('chmod a+x mce-inject_ea')
                 node.run_cmd('echo "CPU 0 BANK 0" > corrected')
                 node.run_cmd(
 
 APEX_USER = 'root'
 APEX_USER_STACK = 'stack'
 APEX_PKEY = '/root/.ssh/id_rsa'
-PATH = os.path.dirname(os.path.realpath(__file__))
 
 
 class Node(object):
             if compute_name == node.get_dict()['name']:
                 stdout = node.run_cmd(
                     'cat /etc/collectd/collectd.conf.d/{}.conf'.format(plugin))
+                if stdout is None:
+                    return default_interval
                 for line in stdout.split('\n'):
                     if 'Interval' in line:
                         return 1
             if compute_name == node.get_dict()['name']:
                 stdout = node.run_cmd(
                     'cat /etc/collectd/collectd.conf.d/{}.conf' .format(plugin))
+                if stdout is None:
+                    return default_values
                 for line in stdout.split('\n'):
                     if 'Interfaces' in line:
                         return line.split(' ', 1)[1]
         for node in nodes:
             if compute_name == node.get_dict()['name']:
                 stdout = node.run_cmd(
-                    'yum list installed | grep mcelog')
+                    'rpm -qa | grep mcelog')
                 if stdout is None:
                     return 0
                 elif 'mcelog' in stdout:
                 aodh_conf = node.run_cmd('ls /etc/collectd/collectd.conf.d')
                 if 'aodh.conf' not in aodh_conf:
                     self.__logger.info(
-                        "AODH Plugin not included in compute node")
+                        "AODH Plugin not included in {}".format(compute_name))
                     return False
                 else:
                     self.__logger.info(
             if compute_name == node.get_dict()['name']:
                 gnocchi_conf = node.run_cmd('ls /etc/collectd/collectd.conf.d')
                 if 'collectd-ceilometer-plugin.conf' not in gnocchi_conf:
-                    self.__logger.info("Gnocchi Plugin not included")
+                    self.__logger.info(
+                        "Gnocchi Plugin not included in node {}".format(
+                            compute_name))
                     return False
                 else:
                     self.__logger.info(
 
         Return boolean value indicating whether function was successful.
         """
+        csv_file = os.path.dirname(os.path.realpath(__file__)) + '/csv.conf'
         plugins = sorted(plugins)
         compute_name = compute.get_name()
         nodes = get_apex_nodes()
         for node in nodes:
             if compute_name == node.get_dict()['name']:
-                node.put_file(
-                    'PATH/csv.conf', 'csv.conf')
+                node.put_file(csv_file, 'csv.conf')
                 node.run_cmd(
                     'sudo cp csv.conf '
                     + '/etc/collectd/collectd.conf.d/csv.conf')
                     "source overcloudrc.v3;"
                     + "aodh alarm list | grep {0} | grep {1}"
                     .format(criteria_list, compute))
+                if stdout is None:
+                    self.__logger.info("aodh alarm list was empty")
+                    return False
                 for line in stdout.splitlines():
                     line = line.replace('|', "")
                     metric_id = line.split()[0]
                     stdout = node.run_cmd(
                         'source overcloudrc.v3; aodh alarm show {}' .format(
                             metric_id))
+                    if stdout is None:
+                        self.__logger.info("aodh alarm list was empty")
+                        return False
                     for line in stdout.splitlines()[3: -1]:
                         line = line.replace('|', "")
                         if line.split()[0] == 'timestamp':
                     stdout = node.run_cmd(
                         "source overcloudrc.v3; aodh alarm show {}" .format(
                             metric_id))
+                    if stdout is None:
+                        self.__logger.info("aodh alarm list was empty")
+                        return False
                     for line in stdout.splitlines()[3:-1]:
                         line = line.replace('|', "")
                         if line.split()[0] == 'timestamp':
                     "source overcloudrc.v3;"
                     + "gnocchi metric list | grep {0} | grep {1}"
                     .format(criteria_list, compute))
+                if stdout is None:
+                        self.__logger.info("gnocchi list was empty")
+                        return False
                 for line in stdout.splitlines():
                     line = line.replace('|', "")
                     metric_id = line.split()[0]
                     stdout = node.run_cmd(
                         'source overcloudrc.v3;gnocchi measures show {}'.format(
                             metric_id))
+                    if stdout is None:
+                        self.__logger.info("gnocchi list was empty")
+                        return False
                     for line in stdout.splitlines()[3: -1]:
                         if line[0] == '+':
                             pass
                     stdout = node.run_cmd(
                         "source overcloudrc.v3;gnocchi measures show {}".format(
                             metric_id))
+                    if stdout is None:
+                        self.__logger.info("gnocchi measures was empty")
+                        return False
                     for line in stdout.splitlines()[3:-1]:
                         if line[0] == '+':
                             pass