diff --git a/monasca_agent/collector/checks/check.py b/monasca_agent/collector/checks/check.py
index 8aa9e3ef..daae0235 100644
--- a/monasca_agent/collector/checks/check.py
+++ b/monasca_agent/collector/checks/check.py
@@ -81,7 +81,7 @@ class AgentCheck(util.Dimensions):
                 # value in white list.
                 dim_key_values = {}
                 if metrics.get(metric):
-                    dim_key_values = metrics.get(metric).values()[0]
+                    dim_key_values = list(metrics.get(metric).values())[0]
                 else:
                     # If white list has a "dimensions" section, set the key
                     # value dimension pairs to all the metrics. But the
diff --git a/monasca_agent/collector/checks_d/apache.py b/monasca_agent/collector/checks_d/apache.py
index 3194f1bc..df4c563a 100644
--- a/monasca_agent/collector/checks_d/apache.py
+++ b/monasca_agent/collector/checks_d/apache.py
@@ -15,8 +15,8 @@
 
 import logging
 import socket
-import urllib2
-import urlparse
+
+from six.moves import urllib
 
 # project
 import monasca_agent.collector.checks as checks
@@ -52,7 +52,7 @@ class Apache(checks.AgentCheck):
         if not self.url:
             raise Exception("Missing 'apache_status_url' in Apache config")
 
-        req = urllib2.Request(self.url, None, util.headers(self.agent_config))
+        req = urllib.request.Request(self.url, None, util.headers(self.agent_config))
         apache_user = instance.get('apache_user', None)
         apache_password = instance.get('apache_password', None)
         if apache_user and apache_password:
@@ -61,7 +61,7 @@ class Apache(checks.AgentCheck):
             log.debug("Not using authentication for Apache Web Server")
 
         # Submit a service check for status page availability.
-        parsed_url = urlparse.urlparse(self.url)
+        parsed_url = urllib.parse.urlparse(self.url)
         apache_host = parsed_url.hostname
         apache_port = str(parsed_url.port or 80)
         service_check_name = 'apache.status'
@@ -78,7 +78,7 @@ class Apache(checks.AgentCheck):
                                           instance)
 
         try:
-            request = urllib2.urlopen(req)
+            request = urllib.request.urlopen(req)
         except Exception as e:
             self.log.info(
                 "%s is DOWN, error: %s. Connection failed." % (service_check_name, str(e)))
diff --git a/monasca_agent/collector/checks_d/cadvisor_host.py b/monasca_agent/collector/checks_d/cadvisor_host.py
index 002a5523..2fe7d81a 100644
--- a/monasca_agent/collector/checks_d/cadvisor_host.py
+++ b/monasca_agent/collector/checks_d/cadvisor_host.py
@@ -13,8 +13,8 @@
 
 import requests
 
-from urlparse import urlparse
-from urlparse import urlunparse
+from six.moves.urllib.parse import urlparse
+from six.moves.urllib.parse import urlunparse
 
 from monasca_agent.collector.checks import AgentCheck
 from monasca_agent.collector.checks import utils
diff --git a/monasca_agent/collector/checks_d/ceph.py b/monasca_agent/collector/checks_d/ceph.py
index 86ccc1b4..bdecca42 100644
--- a/monasca_agent/collector/checks_d/ceph.py
+++ b/monasca_agent/collector/checks_d/ceph.py
@@ -63,7 +63,7 @@ class Ceph(checks.AgentCheck):
             return
         ceph_df = self._ceph_cmd('df detail', 'json')
         metrics = self._get_usage_metrics(ceph_df)
-        for metric, value in metrics.iteritems():
+        for metric, value in metrics.items():
             self.gauge(metric, value, dimensions=self.dimensions)
 
     def _collect_stats_metrics(self):
@@ -72,7 +72,7 @@ class Ceph(checks.AgentCheck):
         ceph_status = self._ceph_cmd('status', 'json')
         ceph_status_plain = self._ceph_cmd('status')
         metrics = self._get_stats_metrics(ceph_status, ceph_status_plain)
-        for metric, value in metrics.iteritems():
+        for metric, value in metrics.items():
             self.gauge(metric, value, dimensions=self.dimensions)
 
     def _collect_mon_metrics(self):
@@ -80,10 +80,10 @@ class Ceph(checks.AgentCheck):
             return
         ceph_status = self._ceph_cmd('status', 'json')
         mon_metrics_dict = self._get_mon_metrics(ceph_status)
-        for monitor, metrics in mon_metrics_dict.iteritems():
+        for monitor, metrics in mon_metrics_dict.items():
             mon_dimensions = self.dimensions.copy()
             mon_dimensions['monitor'] = monitor
-            for metric, value in metrics.iteritems():
+            for metric, value in metrics.items():
                 self.gauge(metric, value, dimensions=mon_dimensions)
 
     def _collect_osd_metrics(self):
@@ -95,14 +95,14 @@ class Ceph(checks.AgentCheck):
         osd_metrics_dict = self._get_osd_metrics(ceph_osd_df,
                                                  ceph_osd_perf,
                                                  ceph_osd_dump)
-        for osd, metrics in osd_metrics_dict.iteritems():
+        for osd, metrics in osd_metrics_dict.items():
             osd_dimensions = self.dimensions.copy()
             osd_dimensions['osd'] = osd
-            for metric, value in metrics.iteritems():
+            for metric, value in metrics.items():
                 self.gauge(metric, value, dimensions=osd_dimensions)
 
         osd_summary_metrics = self._get_osd_summary_metrics(ceph_osd_df)
-        for metric, value in osd_summary_metrics.iteritems():
+        for metric, value in osd_summary_metrics.items():
             self.gauge(metric, value, dimensions=self.dimensions)
 
     def _collect_pool_metrics(self):
@@ -110,20 +110,20 @@ class Ceph(checks.AgentCheck):
             return
         ceph_df = self._ceph_cmd('df detail', 'json')
         pool_metrics_dict = self._get_pool_metrics(ceph_df)
-        for pool, metrics in pool_metrics_dict.iteritems():
+        for pool, metrics in pool_metrics_dict.items():
             pool_dimensions = self.dimensions.copy()
             pool_dimensions['pool'] = pool
-            for metric, value in metrics.iteritems():
+            for metric, value in metrics.items():
                 self.gauge(metric, value, dimensions=pool_dimensions)
         self.gauge('ceph.pools.count', len(pool_metrics_dict.keys()),
                    dimensions=self.dimensions)
 
         ceph_osd_pool_stats = self._ceph_cmd('osd pool stats', 'json')
         pool_stats_dict = self._get_pool_stats_metrics(ceph_osd_pool_stats)
-        for pool, metrics in pool_stats_dict.iteritems():
+        for pool, metrics in pool_stats_dict.items():
             pool_dimensions = self.dimensions.copy()
             pool_dimensions['pool'] = pool
-            for metric, value in metrics.iteritems():
+            for metric, value in metrics.items():
                 self.gauge(metric, value, dimensions=pool_dimensions)
 
     def _ceph_cmd(self, args, format='plain'):
@@ -526,14 +526,14 @@ class Ceph(checks.AgentCheck):
         pool_metrics = {}
         for pool in ceph_osd_pool_stats:
             pool_name = pool['pool_name']
-            for metric, value in pool['client_io_rate'].iteritems():
+            for metric, value in pool['client_io_rate'].items():
                 if pool_name in pool_metrics:
                     pool_metrics[pool_name].update({
                         'ceph.pool.client.' + metric: value})
                 else:
                     pool_metrics[pool_name] = {
                         'ceph.pool.client.' + metric: value}
-            for metric, value in pool['recovery_rate'].iteritems():
+            for metric, value in pool['recovery_rate'].items():
                 if pool_name in pool_metrics:
                     pool_metrics[pool_name].update({
                         'ceph.pool.recovery.' + metric: value})
diff --git a/monasca_agent/collector/checks_d/cert_check.py b/monasca_agent/collector/checks_d/cert_check.py
index e111825d..a3be2180 100644
--- a/monasca_agent/collector/checks_d/cert_check.py
+++ b/monasca_agent/collector/checks_d/cert_check.py
@@ -14,7 +14,8 @@
 from datetime import datetime
 import socket
 import ssl
-from urlparse import urlparse
+
+from six.moves.urllib.parse import urlparse
 
 from monasca_agent.collector.checks import AgentCheck
 
diff --git a/monasca_agent/collector/checks_d/couch.py b/monasca_agent/collector/checks_d/couch.py
index 19739ae8..cf1c6289 100644
--- a/monasca_agent/collector/checks_d/couch.py
+++ b/monasca_agent/collector/checks_d/couch.py
@@ -12,7 +12,8 @@
 # under the License.
 
 import json
-import urllib2
+
+from six.moves import urllib
 
 from monasca_agent.collector.checks import AgentCheck
 from monasca_agent.common.util import headers
@@ -46,10 +47,10 @@ class CouchDb(AgentCheck):
 
         """
         self.log.debug('Fetching Couchdb stats at url: %s' % url)
-        req = urllib2.Request(url, None, headers(self.agent_config))
+        req = urllib.request.Request(url, None, headers(self.agent_config))
 
         # Do the request, log any errors
-        request = urllib2.urlopen(req)
+        request = urllib.request.urlopen(req)
         response = request.read()
         return json.loads(response)
 
diff --git a/monasca_agent/collector/checks_d/couchbase.py b/monasca_agent/collector/checks_d/couchbase.py
index 235d66fb..7ef10a98 100644
--- a/monasca_agent/collector/checks_d/couchbase.py
+++ b/monasca_agent/collector/checks_d/couchbase.py
@@ -14,7 +14,8 @@
 import json
 import re
 import sys
-import urllib2
+
+from six.moves import urllib
 
 from monasca_agent.collector.checks import AgentCheck
 from monasca_agent.collector.checks.utils import add_basic_auth
@@ -67,15 +68,15 @@ class Couchbase(AgentCheck):
 
         """
         self.log.debug('Fetching Couchbase stats at url: %s' % url)
-        req = urllib2.Request(url, None, headers(self.agent_config))
+        req = urllib.request.Request(url, None, headers(self.agent_config))
         if 'user' in instance and 'password' in instance:
             add_basic_auth(req, instance['user'], instance['password'])
 
         if instance['is_recent_python']:
             timeout = instance.get('timeout', DEFAULT_TIMEOUT)
-            request = urllib2.urlopen(req, timeout=timeout)
+            request = urllib.request.urlopen(req, timeout=timeout)
         else:
-            request = urllib2.urlopen(req)
+            request = urllib.request.urlopen(req)
 
         response = request.read()
         return json.loads(response)
diff --git a/monasca_agent/collector/checks_d/docker.py b/monasca_agent/collector/checks_d/docker.py
index 88407018..2931b56f 100644
--- a/monasca_agent/collector/checks_d/docker.py
+++ b/monasca_agent/collector/checks_d/docker.py
@@ -78,7 +78,7 @@ class Docker(checks.AgentCheck):
     def _report_container_metrics(self, container_dict, add_kubernetes_dimensions, dimensions):
         self._curr_system_cpu, self._cpu_count = self._get_system_cpu_ns()
         system_memory = self._get_total_memory()
-        for container in container_dict.itervalues():
+        for container in container_dict.values():
             try:
                 container_dimensions = dimensions.copy()
                 container_id = container['Id']
@@ -222,7 +222,7 @@ class Docker(checks.AgentCheck):
 
     def _find_cgroup_filename_pattern(self, container_id):
         # We try with different cgroups so that it works even if only one is properly working
-        for mountpoint in self._mount_points.itervalues():
+        for mountpoint in self._mount_points.values():
             stat_file_path_lxc = os.path.join(mountpoint, "lxc")
             stat_file_path_docker = os.path.join(mountpoint, "docker")
             stat_file_path_coreos = os.path.join(mountpoint, "system.slice")
diff --git a/monasca_agent/collector/checks_d/elastic.py b/monasca_agent/collector/checks_d/elastic.py
index e241c269..024afc7a 100644
--- a/monasca_agent/collector/checks_d/elastic.py
+++ b/monasca_agent/collector/checks_d/elastic.py
@@ -15,8 +15,8 @@ import json
 import socket
 import subprocess
 import sys
-import urllib2
-import urlparse
+
+from six.moves import urllib
 
 from monasca_agent.collector.checks import AgentCheck
 from monasca_agent.collector.checks.utils import add_basic_auth
@@ -186,7 +186,7 @@ class ElasticSearch(AgentCheck):
 
         # Support URLs that have a path in them from the config, for
         # backwards-compatibility.
-        parsed = urlparse.urlparse(config_url)
+        parsed = urllib.parse.urlparse(config_url)
         if parsed[2] != "":
             config_url = "%s://%s" % (parsed[0], parsed[1])
 
@@ -198,12 +198,12 @@ class ElasticSearch(AgentCheck):
         self._define_params(version)
 
         # Load stats data.
-        url = urlparse.urljoin(config_url, self.STATS_URL)
+        url = urllib.parse.urljoin(config_url, self.STATS_URL)
         stats_data = self._get_data(url, auth)
         self._process_stats_data(config_url, stats_data, auth, dimensions=dimensions)
 
         # Load the health data.
-        url = urlparse.urljoin(config_url, self.HEALTH_URL)
+        url = urllib.parse.urljoin(config_url, self.HEALTH_URL)
         health_data = self._get_data(url, auth)
         self._process_health_data(config_url, health_data, dimensions=dimensions)
 
@@ -282,10 +282,10 @@ class ElasticSearch(AgentCheck):
 
         `auth` is a tuple of (username, password) or None
         """
-        req = urllib2.Request(url, None, headers(self.agent_config))
+        req = urllib.request.Request(url, None, headers(self.agent_config))
         if auth:
             add_basic_auth(req, *auth)
-        request = urllib2.urlopen(req)
+        request = urllib.request.urlopen(req)
         response = request.read()
         return json.loads(response)
 
@@ -318,7 +318,7 @@ class ElasticSearch(AgentCheck):
                 # Fetch interface address from ifconfig or ip addr and check
                 # against the primary IP from ES
                 try:
-                    nodes_url = urlparse.urljoin(config_url, self.NODES_URL)
+                    nodes_url = urllib.parse.urljoin(config_url, self.NODES_URL)
                     primary_addr = self._get_primary_addr(nodes_url, node, auth)
                 except NodeNotFound:
                     # Skip any nodes that aren't found
@@ -334,11 +334,11 @@ class ElasticSearch(AgentCheck):
 
         Used in ES < 0.19
         """
-        req = urllib2.Request(url, None, headers(self.agent_config))
+        req = urllib.request.Request(url, None, headers(self.agent_config))
         # Load basic authentication configuration, if available.
         if auth:
             add_basic_auth(req, *auth)
-        request = urllib2.urlopen(req)
+        request = urllib.request.urlopen(req)
         response = request.read()
         data = json.loads(response)
 
diff --git a/monasca_agent/collector/checks_d/haproxy.py b/monasca_agent/collector/checks_d/haproxy.py
index 986d20c8..0614a265 100644
--- a/monasca_agent/collector/checks_d/haproxy.py
+++ b/monasca_agent/collector/checks_d/haproxy.py
@@ -12,7 +12,8 @@
 # under the License.
 
 from collections import defaultdict
-import urllib2
+from six.moves import urllib
+
 
 from monasca_agent.collector.checks import AgentCheck
 from monasca_agent.common.util import headers
@@ -82,17 +83,17 @@ class HAProxy(AgentCheck):
         """
         # Try to fetch data from the stats URL
 
-        passman = urllib2.HTTPPasswordMgrWithDefaultRealm()
+        passman = urllib.request.HTTPPasswordMgrWithDefaultRealm()
         passman.add_password(None, url, username, password)
-        authhandler = urllib2.HTTPBasicAuthHandler(passman)
-        opener = urllib2.build_opener(authhandler)
-        urllib2.install_opener(opener)
+        authhandler = urllib.request.HTTPBasicAuthHandler(passman)
+        opener = urllib.request.build_opener(authhandler)
+        urllib.request.install_opener(opener)
         url = "%s%s" % (url, STATS_URL)
 
         self.log.debug("HAProxy Fetching haproxy search data from: %s" % url)
 
-        req = urllib2.Request(url, None, headers(self.agent_config))
-        request = urllib2.urlopen(req)
+        req = urllib.request.Request(url, None, headers(self.agent_config))
+        request = urllib.request.urlopen(req)
         response = request.read()
         # Split the data by line
         return response.split('\n')
diff --git a/monasca_agent/collector/checks_d/kyototycoon.py b/monasca_agent/collector/checks_d/kyototycoon.py
index 1f0db992..c4c2390b 100644
--- a/monasca_agent/collector/checks_d/kyototycoon.py
+++ b/monasca_agent/collector/checks_d/kyototycoon.py
@@ -13,7 +13,8 @@
 
 from collections import defaultdict
 import re
-import urllib2
+
+from six.moves import urllib
 
 from monasca_agent.collector.checks import AgentCheck
 
@@ -68,7 +69,7 @@ class KyotoTycoonCheck(AgentCheck):
         if name is not None:
             dimensions.update({'instance': name})
 
-        response = urllib2.urlopen(url)
+        response = urllib.request.urlopen(url)
         body = response.read()
 
         totals = defaultdict(lambda: 0)
diff --git a/monasca_agent/collector/checks_d/lighttpd.py b/monasca_agent/collector/checks_d/lighttpd.py
index 3dd33b2a..a81448a9 100644
--- a/monasca_agent/collector/checks_d/lighttpd.py
+++ b/monasca_agent/collector/checks_d/lighttpd.py
@@ -11,7 +11,7 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import urllib2
+from six.moves import urllib
 
 from monasca_agent.collector.checks import AgentCheck
 from monasca_agent.collector.checks.utils import add_basic_auth
@@ -83,10 +83,10 @@ class Lighttpd(AgentCheck):
 
         dimensions = self._set_dimensions(None, instance)
         self.log.debug("Connecting to %s" % url)
-        req = urllib2.Request(url, None, headers(self.agent_config))
+        req = urllib.request.Request(url, None, headers(self.agent_config))
         if 'user' in instance and 'password' in instance:
             add_basic_auth(req, instance['user'], instance['password'])
-        request = urllib2.urlopen(req)
+        request = urllib.request.urlopen(req)
         headers_resp = request.info().headers
         server_version = self._get_server_version(headers_resp)
         response = request.read()
diff --git a/monasca_agent/collector/checks_d/lxc.py b/monasca_agent/collector/checks_d/lxc.py
index 2d01a141..d2dfef20 100644
--- a/monasca_agent/collector/checks_d/lxc.py
+++ b/monasca_agent/collector/checks_d/lxc.py
@@ -64,7 +64,7 @@ class LXC(checks.AgentCheck):
             return
         metrics = self._get_cpu_metrics(container_name)
         cpu_dimensions = self._get_dimensions(container_name)
-        for metric, value in metrics.iteritems():
+        for metric, value in metrics.items():
             self.gauge(metric, value, dimensions=cpu_dimensions)
 
     def _collect_mem_metrics(self, container_name):
@@ -72,7 +72,7 @@ class LXC(checks.AgentCheck):
             return
         metrics = self._get_mem_metrics(container_name)
         mem_dimensions = self._get_dimensions(container_name)
-        for metric, value in metrics.iteritems():
+        for metric, value in metrics.items():
             self.gauge(metric, value, dimensions=mem_dimensions)
 
     def _collect_swap_metrics(self, container_name):
@@ -81,17 +81,17 @@ class LXC(checks.AgentCheck):
         metrics = self._get_swap_metrics(container_name)
         if metrics:
             swap_dimensions = self._get_dimensions(container_name)
-            for metric, value in metrics.iteritems():
+            for metric, value in metrics.items():
                 self.gauge(metric, value, dimensions=swap_dimensions)
 
     def _collect_net_metrics(self, container_name):
         if not self.instance.get('net', True):
             return
         metrics = self._get_net_metrics(container_name)
-        for iface_name, iface_metrics in metrics.iteritems():
+        for iface_name, iface_metrics in metrics.items():
             net_dimensions = self._get_dimensions(container_name,
                                                   {'iface': iface_name})
-            for metric, value in iface_metrics.iteritems():
+            for metric, value in iface_metrics.items():
                 self.gauge(metric, value, dimensions=net_dimensions)
 
     def _collect_disk_metrics(self, container_name):
@@ -99,7 +99,7 @@ class LXC(checks.AgentCheck):
             return
         metrics = self._get_disk_metrics(container_name)
         disk_dimensions = self._get_dimensions(container_name)
-        for metric, value in metrics.iteritems():
+        for metric, value in metrics.items():
             self.gauge(metric, value, dimensions=disk_dimensions)
 
     def _get_cpu_metrics(self, container_name):
diff --git a/monasca_agent/collector/checks_d/nginx.py b/monasca_agent/collector/checks_d/nginx.py
index 423fe88b..de325d52 100644
--- a/monasca_agent/collector/checks_d/nginx.py
+++ b/monasca_agent/collector/checks_d/nginx.py
@@ -12,7 +12,8 @@
 # under the License.
 
 import re
-import urllib2
+
+from six.moves import urllib
 
 from monasca_agent.collector.checks import AgentCheck
 from monasca_agent.collector.checks.utils import add_basic_auth
@@ -46,10 +47,10 @@ class Nginx(AgentCheck):
 
     def _get_data(self, instance):
         url = instance.get('nginx_status_url')
-        req = urllib2.Request(url, None, headers(self.agent_config))
+        req = urllib.request.Request(url, None, headers(self.agent_config))
         if 'user' in instance and 'password' in instance:
             add_basic_auth(req, instance['user'], instance['password'])
-        request = urllib2.urlopen(req)
+        request = urllib.request.urlopen(req)
         return request.read()
 
     def _get_metrics(self, response, dimensions):
diff --git a/monasca_agent/collector/checks_d/ovs.py b/monasca_agent/collector/checks_d/ovs.py
index a14a65ae..ca572eb3 100644
--- a/monasca_agent/collector/checks_d/ovs.py
+++ b/monasca_agent/collector/checks_d/ovs.py
@@ -390,7 +390,7 @@ class OvsCheck(AgentCheck):
         #
         # Grab the first metric name and see if it's in the cache.
         #
-        metric_name = self._get_metrics_map(measure).keys()[0]
+        metric_name = list(self._get_metrics_map(measure).keys())[0]
 
         for ifx in ctr_cache:
             if metric_name not in ctr_cache[ifx]:
diff --git a/monasca_agent/collector/checks_d/rabbitmq.py b/monasca_agent/collector/checks_d/rabbitmq.py
index 3fac3c8c..ffcdd40a 100644
--- a/monasca_agent/collector/checks_d/rabbitmq.py
+++ b/monasca_agent/collector/checks_d/rabbitmq.py
@@ -13,8 +13,8 @@
 
 import json
 import re
-import urllib2
-import urlparse
+
+from six.moves import urllib
 
 import monasca_agent.collector.checks as checks
 
@@ -161,11 +161,11 @@ class RabbitMQ(checks.AgentCheck):
                         "{0} / {0}_regexes parameter must be a list".format(object_type))
 
         # setup urllib2 for Basic Auth
-        auth_handler = urllib2.HTTPBasicAuthHandler()
+        auth_handler = urllib.request.HTTPBasicAuthHandler()
         auth_handler.add_password(
             realm='RabbitMQ Management', uri=base_url, user=username, passwd=password)
-        opener = urllib2.build_opener(auth_handler)
-        urllib2.install_opener(opener)
+        opener = urllib.request.build_opener(auth_handler)
+        urllib.request.install_opener(opener)
 
         return base_url, max_detailed, specified
 
@@ -191,8 +191,8 @@ class RabbitMQ(checks.AgentCheck):
     @staticmethod
     def _get_data(url):
         try:
-            data = json.loads(urllib2.urlopen(url).read())
-        except urllib2.URLError as e:
+            data = json.loads(urllib.request.urlopen(url).read())
+        except urllib.error.URLError as e:
             raise Exception('Cannot open RabbitMQ API url: %s %s' % (url, str(e)))
         except ValueError as e:
             raise Exception('Cannot parse JSON response from API url: %s %s' % (url, str(e)))
@@ -207,7 +207,7 @@ class RabbitMQ(checks.AgentCheck):
         filters: explicit or regexes filters of specified queues or nodes
                 (specified in the yaml file)
         """
-        data = self._get_data(urlparse.urljoin(base_url, object_type))
+        data = self._get_data(urllib.parse.urljoin(base_url, object_type))
         # Make a copy of this list as we will remove items from it at each iteration
         explicit_filters = list(filters['explicit'])
         regex_filters = filters['regexes']
@@ -291,7 +291,7 @@ class RabbitMQ(checks.AgentCheck):
         dimensions_list = DIMENSIONS_MAP[object_type].copy()
         dimensions = self._set_dimensions({'component': 'rabbitmq', 'service': 'rabbitmq'},
                                           instance)
-        for d in dimensions_list.iterkeys():
+        for d in dimensions_list:
             dim = data.get(d, None)
             if dim not in [None, ""]:
                 dimensions[dimensions_list[d]] = dim
diff --git a/monasca_agent/collector/checks_d/redisdb.py b/monasca_agent/collector/checks_d/redisdb.py
index bf7ebb2c..85ebc77e 100644
--- a/monasca_agent/collector/checks_d/redisdb.py
+++ b/monasca_agent/collector/checks_d/redisdb.py
@@ -101,7 +101,7 @@ class Redis(AgentCheck):
 
         """
         try:
-            for item in string.split(','):
+            for item in ','.split():
                 k, v = item.rsplit('=', 1)
                 if k == key:
                     try:
diff --git a/monasca_agent/collector/checks_d/supervisord.py b/monasca_agent/collector/checks_d/supervisord.py
index a49191ce..39482038 100644
--- a/monasca_agent/collector/checks_d/supervisord.py
+++ b/monasca_agent/collector/checks_d/supervisord.py
@@ -18,7 +18,8 @@ import itertools
 import re
 import socket
 import time
-import xmlrpclib
+
+from six.moves import xmlrpc_client
 
 # 3p
 import supervisor.xmlrpc
@@ -95,7 +96,7 @@ class Supervisord(checks.AgentCheck):
         # Gather all process information
         try:
             processes = supe.getAllProcessInfo()
-        except xmlrpclib.Fault as error:
+        except xmlrpc_client.Fault as error:
             raise Exception(
                 'An error occurred while reading process information: %s %s'
                 % (error.faultCode, error.faultString)
@@ -118,7 +119,7 @@ class Supervisord(checks.AgentCheck):
                        dimensions=dimensions, value_meta=server_details)
             raise Exception(msg)
 
-        except xmlrpclib.ProtocolError as error:
+        except xmlrpc_client.ProtocolError as error:
             if error.errcode == 401:  # authorization error
                 msg = 'Username or password to %s are incorrect.' % server_name
             else:
@@ -197,14 +198,14 @@ class Supervisord(checks.AgentCheck):
         if sock is not None:
             host = instance.get('host', DEFAULT_SOCKET_IP)
             transport = supervisor.xmlrpc.SupervisorTransport(None, None, sock)
-            server = xmlrpclib.ServerProxy(host, transport=transport)
+            server = xmlrpc_client.ServerProxy(host, transport=transport)
         else:
             host = instance.get('host', DEFAULT_HOST)
             port = instance.get('port', DEFAULT_PORT)
             user = instance.get('user')
             password = instance.get('pass')
             auth = '%s:%s@' % (user, password) if user and password else ''
-            server = xmlrpclib.Server('http://%s%s:%s/RPC2' % (auth, host, port))
+            server = xmlrpc_client.Server('http://%s%s:%s/RPC2' % (auth, host, port))
         return server.supervisor
 
     @staticmethod
diff --git a/monasca_agent/collector/checks_d/wmi_check.py b/monasca_agent/collector/checks_d/wmi_check.py
index 130c7993..edc2cf37 100644
--- a/monasca_agent/collector/checks_d/wmi_check.py
+++ b/monasca_agent/collector/checks_d/wmi_check.py
@@ -61,8 +61,8 @@ class WMICheck(AgentCheck):
         # If there are filters, we need one query per filter.
         if filters:
             for f in filters:
-                prop = f.keys()[0]
-                search = f.values()[0]
+                prop = list(f.keys())[0]
+                search = list(f.values())[0]
                 if SEARCH_WILDCARD in search:
                     search = search.replace(SEARCH_WILDCARD, '%')
                     wql = "SELECT * FROM %s WHERE %s LIKE '%s'" % (wmi_class, prop, search)
diff --git a/monasca_agent/collector/checks_d/zk.py b/monasca_agent/collector/checks_d/zk.py
index 086bb0cc..105be467 100644
--- a/monasca_agent/collector/checks_d/zk.py
+++ b/monasca_agent/collector/checks_d/zk.py
@@ -37,9 +37,10 @@ Tested with Zookeeper versions 3.0.0 to 3.4.10
 
 import re
 import socket
-from StringIO import StringIO
 import struct
 
+from six import StringIO
+
 from monasca_agent.collector.checks import AgentCheck
 
 
diff --git a/monasca_agent/collector/virt/vmware/inspector.py b/monasca_agent/collector/virt/vmware/inspector.py
index 8e9a1f44..ff2cd6d8 100644
--- a/monasca_agent/collector/virt/vmware/inspector.py
+++ b/monasca_agent/collector/virt/vmware/inspector.py
@@ -118,7 +118,7 @@ class VsphereInspector(virt_inspector.Inspector):
             vnic_id_to_stats_map = self._ops.query_vm_device_stats(
                 vm_moid, net_counter_id, duration)
             vnic_stats[net_counter] = vnic_id_to_stats_map
-            vnic_ids.update(vnic_id_to_stats_map.iterkeys())
+            vnic_ids.update(vnic_id_to_stats_map.keys())
 
         # Stats provided from vSphere are in KB/s, converting it to B/s.
         for vnic_id in vnic_ids:
@@ -169,7 +169,7 @@ class VsphereInspector(virt_inspector.Inspector):
             disk_id_to_stat_map = self._ops.query_vm_device_stats(
                 vm_moid, disk_counter_id, duration)
             disk_stats[disk_counter] = disk_id_to_stat_map
-            disk_ids.update(disk_id_to_stat_map.iterkeys())
+            disk_ids.update(disk_id_to_stat_map.keys())
 
         for disk_id in disk_ids:
 
diff --git a/monasca_agent/common/util.py b/monasca_agent/common/util.py
index d257fdb4..f3789e1f 100644
--- a/monasca_agent/common/util.py
+++ b/monasca_agent/common/util.py
@@ -686,7 +686,7 @@ def chunks(iterable, chunk_size):
         count = 0
         try:
             for _ in range(chunk_size):
-                chunk[count] = iterable.next()
+                chunk[count] = next(iterable)
                 count += 1
             yield chunk[:count]
         except StopIteration:
diff --git a/tests/detection/test_ovs.py b/tests/detection/test_ovs.py
index 3c4fc184..063a743a 100644
--- a/tests/detection/test_ovs.py
+++ b/tests/detection/test_ovs.py
@@ -11,7 +11,6 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import ConfigParser
 import contextlib
 import logging
 import os
@@ -23,6 +22,7 @@ from oslo_config import cfg
 
 from mock import patch
 from mock.mock import MagicMock
+from six.moves import configparser
 
 from monasca_setup.detection import utils
 from monasca_setup.detection.plugins.ovs import Ovs
@@ -80,7 +80,7 @@ class TestOvs(unittest.TestCase):
         ovs_obj.conf = MagicMock()
         ovs_obj.conf.default_config_files = ovs_obj.neutron_conf
         ovs_obj.conf.default_config_dirs = os.path.abspath(os.path.join(ovs_obj.neutron_conf, os.pardir))
-        with patch.object(ConfigParser, 'SafeConfigParser') as mock_config_parser:
+        with patch.object(configparser, 'SafeConfigParser') as mock_config_parser:
             config_parser_obj = mock_config_parser.return_value
             with contextlib.nested(
                     patch.object(cfg, 'CONF'),
diff --git a/tests/test_aggregator.py b/tests/test_aggregator.py
index 4c47b437..87a10ae0 100644
--- a/tests/test_aggregator.py
+++ b/tests/test_aggregator.py
@@ -13,6 +13,8 @@
 
 import unittest
 
+import six
+
 import monasca_agent.common.aggregator as aggregator
 import monasca_agent.common.metrics as metrics_pkg
 
@@ -64,7 +66,7 @@ class TestMetricsAggregator(unittest.TestCase):
                            value_meta=value_meta)
 
     def testValidMetricUnicodeDimensionValue(self):
-        dimensions = {unichr(2440): 'B', 'B': 'C', 'D': 'E'}
+        dimensions = {six.unichr(2440): 'B', 'B': 'C', 'D': 'E'}
         value_meta = {"This is a test": "test, test, test"}
         self.submit_metric("Foo",
                            5,
@@ -72,7 +74,7 @@ class TestMetricsAggregator(unittest.TestCase):
                            value_meta=value_meta)
 
     def testValidMetricUnicodeDimensionKey(self):
-        dimensions = {'A': 'B', 'B': unichr(920), 'D': 'E'}
+        dimensions = {'A': 'B', 'B': six.unichr(920), 'D': 'E'}
         value_meta = {"This is a test": "test, test, test"}
         self.submit_metric("Foo",
                            5,
@@ -82,7 +84,7 @@ class TestMetricsAggregator(unittest.TestCase):
     def testValidMetricUnicodeMetricName(self):
         dimensions = {'A': 'B', 'B': 'C', 'D': 'E'}
         value_meta = {"This is a test": "test, test, test"}
-        self.submit_metric(unichr(6021),
+        self.submit_metric(six.unichr(6021),
                            5,
                            dimensions=dimensions,
                            value_meta=value_meta)
@@ -161,7 +163,6 @@ class TestMetricsAggregator(unittest.TestCase):
 
     def testInvalidDimensionKeyLength(self):
         dimensions = {'A'*256: 'B', 'B': 'C', 'D': 'E'}
-        print dimensions
         value_meta = {"This is a test": "test, test, test"}
         self.submit_metric("Foo",
                            5,
diff --git a/tests_to_fix/performance/benchmark_aggregator.py b/tests_to_fix/performance/benchmark_aggregator.py
index 4c706741..3e0373ff 100644
--- a/tests_to_fix/performance/benchmark_aggregator.py
+++ b/tests_to_fix/performance/benchmark_aggregator.py
@@ -14,6 +14,8 @@
 Performance tests for the agent/dogstatsd metrics aggregator.
 """
 
+from six.moves import range
+
 
 from monasca_agent.common.aggregator import MetricsAggregator
 
@@ -27,9 +29,9 @@ class TestAggregatorPerf(object):
     def test_dogstatsd_aggregation_perf(self):
         ma = MetricsAggregator('my.host')
 
-        for _ in xrange(self.FLUSH_COUNT):
-            for i in xrange(self.LOOPS_PER_FLUSH):
-                for j in xrange(self.METRIC_COUNT):
+        for _ in range(self.FLUSH_COUNT):
+            for i in range(self.LOOPS_PER_FLUSH):
+                for j in range(self.METRIC_COUNT):
 
                     # metrics
                     ma.submit_packets('counter.%s:%s|c' % (j, i))
@@ -54,10 +56,10 @@ class TestAggregatorPerf(object):
     def test_checksd_aggregation_perf(self):
         ma = MetricsAggregator('my.host')
 
-        for _ in xrange(self.FLUSH_COUNT):
-            for i in xrange(self.LOOPS_PER_FLUSH):
+        for _ in range(self.FLUSH_COUNT):
+            for i in range(self.LOOPS_PER_FLUSH):
                 # Counters
-                for j in xrange(self.METRIC_COUNT):
+                for j in range(self.METRIC_COUNT):
                     ma.increment('counter.%s' % j, i)
                     ma.gauge('gauge.%s' % j, i)
                     ma.histogram('histogram.%s' % j, i)
diff --git a/tests_to_fix/test_common.py b/tests_to_fix/test_common.py
index a03c9e74..f3506d7d 100644
--- a/tests_to_fix/test_common.py
+++ b/tests_to_fix/test_common.py
@@ -130,7 +130,7 @@ class TestAggregator(unittest.TestCase):
         self.aggr.increment(
             'test-counter', 1, dimensions={'a': 'avalue', 'b': 'bvalue', 'b': 'bvalue'})
         self.assertEqual(len(self.aggr.metrics), 1, self.aggr.metrics)
-        metric = self.aggr.metrics.values()[0]
+        metric = list(self.aggr.metrics.values())[0]
         self.assertEqual(metric.value, 2)
 
 if __name__ == '__main__':
diff --git a/tests_to_fix/test_elastic.py b/tests_to_fix/test_elastic.py
index fee925a4..95bc9ffc 100644
--- a/tests_to_fix/test_elastic.py
+++ b/tests_to_fix/test_elastic.py
@@ -15,11 +15,12 @@ import logging
 logging.basicConfig()
 import subprocess
 import time
-import urllib2
-import urlparse
 from nose.plugins.skip import SkipTest
 from tests.common import load_check
 
+from six.moves import urllib
+
+
 PORT = 9200
 MAX_WAIT = 150
 
@@ -30,8 +31,8 @@ class TestElastic(unittest.TestCase):
         loop = 0
         while True:
             try:
-                req = urllib2.Request(url, None)
-                request = urllib2.urlopen(req)
+                req = urllib.request.Request(url, None)
+                request = urllib.request.urlopen(req)
                 break
             except Exception:
                 time.sleep(0.5)
diff --git a/tests_to_fix/test_haproxy.py b/tests_to_fix/test_haproxy.py
index fd0177cc..ff707297 100644
--- a/tests_to_fix/test_haproxy.py
+++ b/tests_to_fix/test_haproxy.py
@@ -13,7 +13,6 @@
 import unittest
 import subprocess
 import time
-import urllib2
 import tempfile
 import os
 import logging
@@ -22,6 +21,9 @@ from tests.common import load_check, kill_subprocess
 from nose.plugins.attrib import attr
 from nose.plugins.skip import SkipTest
 
+from six.moves import urllib
+
+
 logging.basicConfig()
 
 MAX_WAIT = 30
@@ -36,14 +38,14 @@ class HaproxyTestCase(unittest.TestCase):
         while True:
             try:
                 STATS_URL = ";csv;norefresh"
-                passman = urllib2.HTTPPasswordMgrWithDefaultRealm()
+                passman = urllib.request.HTTPPasswordMgrWithDefaultRealm()
                 passman.add_password(None, url, "datadog", "isdevops")
-                authhandler = urllib2.HTTPBasicAuthHandler(passman)
-                opener = urllib2.build_opener(authhandler)
-                urllib2.install_opener(opener)
+                authhandler = urllib.request.HTTPBasicAuthHandler(passman)
+                opener = urllib.request.build_opener(authhandler)
+                urllib.request.install_opener(opener)
                 url = "%s%s" % (url, STATS_URL)
-                req = urllib2.Request(url)
-                request = urllib2.urlopen(req)
+                req = urllib.request.Request(url)
+                request = urllib.request.urlopen(req)
                 break
             except Exception:
                 time.sleep(0.5)
diff --git a/tests_to_fix/test_laconic.py b/tests_to_fix/test_laconic.py
index b1d6c210..89b11066 100644
--- a/tests_to_fix/test_laconic.py
+++ b/tests_to_fix/test_laconic.py
@@ -12,10 +12,11 @@
 
 import logging
 import unittest
-from cStringIO import StringIO
 
 from collector.checks import LaconicFilter
 
+from six.moves import cStringIO as StringIO
+
 
 class TestLaconic(unittest.TestCase):
 
diff --git a/tests_to_fix/test_monstatsd.py b/tests_to_fix/test_monstatsd.py
index 861b55cd..e3741ce9 100644
--- a/tests_to_fix/test_monstatsd.py
+++ b/tests_to_fix/test_monstatsd.py
@@ -15,6 +15,7 @@ import time
 import unittest
 
 import nose.tools as nt
+from six.moves import range
 
 from monasca_agent.common.aggregator import MetricsAggregator
 
@@ -255,7 +256,7 @@ class TestUnitMonascaStatsd(unittest.TestCase):
         percentiles = range(100)
         random.shuffle(percentiles)  # in place
         for i in percentiles:
-            for j in xrange(20):
+            for j in range(20):
                 for type_ in ['h', 'ms']:
                     m = 'my.p:%s|%s' % (i, type_)
                     stats.submit_packets(m)
@@ -362,7 +363,7 @@ class TestUnitMonascaStatsd(unittest.TestCase):
         cnt = 100000
         for run in [1, 2]:
             stats = MetricsAggregator('myhost')
-            for i in xrange(cnt):
+            for i in range(cnt):
                 if run == 2:
                     stats.submit_packets('test.counter:1|c|@0.5')
                     stats.submit_packets('test.hist:1|ms|@0.5')
diff --git a/tests_to_fix/test_postfix.py b/tests_to_fix/test_postfix.py
index 23e20ec9..cd02176f 100644
--- a/tests_to_fix/test_postfix.py
+++ b/tests_to_fix/test_postfix.py
@@ -19,6 +19,7 @@ import binascii
 import re
 import shutil
 from nose.plugins.skip import SkipTest
+from six.moves import range
 
 class TestPostfix(unittest.TestCase):
     #
@@ -74,7 +75,7 @@ class TestPostfix(unittest.TestCase):
         """ % (self.queue_root))
 
         # stuff 10K msgs in random queues
-        for _ in xrange(1, 10000):
+        for _ in range(1, 10000):
             shuffle(self.queues)
             rand_queue = sample(self.queues, 1)[0]
             queue_file = binascii.b2a_hex(os.urandom(7))
diff --git a/tests_to_fix/test_system.py b/tests_to_fix/test_system.py
index 74d7b2d6..76b67308 100644
--- a/tests_to_fix/test_system.py
+++ b/tests_to_fix/test_system.py
@@ -16,6 +16,8 @@ import platform
 import re
 import unittest
 
+from six.moves import reduce
+
 logging.basicConfig(level=logging.DEBUG)
 logger = logging.getLogger(__file__)
 
@@ -138,8 +140,8 @@ none                  985964       1  985963    1% /lib/init/rw
             res = disk.check()
             # Assert we have disk & inode stats
             assert len(res) == 2
-            assert res.keys()[0]
-            assert res.keys()[1]
+            assert list(res.keys())[0]
+            assert list(res.keys())[1]
 
     def testMemory(self):
         global logger
diff --git a/tests_to_fix/test_tail.py b/tests_to_fix/test_tail.py
index 380f29c9..57daa1ae 100644
--- a/tests_to_fix/test_tail.py
+++ b/tests_to_fix/test_tail.py
@@ -58,7 +58,7 @@ class TestTail(unittest.TestCase):
 
         # Consume from the tail
         gen = tail.tail(line_by_line=False, move_end=True)
-        gen.next()
+        next(gen)
 
         # Verify that the tail consumed the data I wrote
         self.assertEqual(tail._size, len(init_string))
@@ -73,7 +73,7 @@ class TestTail(unittest.TestCase):
             self.log_file.flush()
 
             # Verify that the tail recognized the logrotation
-            gen.next()
+            next(gen)
             self.assertEqual(self.last_line, new_string[:-1], self.last_line)
         except OSError:
             "logrotate is not present"
diff --git a/tests_to_fix/test_transaction.py b/tests_to_fix/test_transaction.py
index 99b4b07f..cef8d893 100644
--- a/tests_to_fix/test_transaction.py
+++ b/tests_to_fix/test_transaction.py
@@ -13,6 +13,8 @@
 import unittest
 from datetime import timedelta, datetime
 
+from six.moves import range
+
 from monasca_agent.forwarder.transaction import Transaction, TransactionManager
 from monasca_agent.forwarder.daemon import MAX_QUEUE_SIZE, THROTTLING_DELAY
 
@@ -50,7 +52,7 @@ class TestTransaction(unittest.TestCase):
 
         step = 10
         oneTrSize = (MAX_QUEUE_SIZE / step) - 1
-        for i in xrange(step):
+        for i in range(step):
             tr = memTransaction(oneTrSize, trManager)
             trManager.append(tr)
 
@@ -94,7 +96,7 @@ class TestTransaction(unittest.TestCase):
 
         # Add 3 transactions, make sure no memory limit is in the way
         oneTrSize = MAX_QUEUE_SIZE / 10
-        for i in xrange(3):
+        for i in range(3):
             tr = memTransaction(oneTrSize, trManager)
             trManager.append(tr)
 
diff --git a/tests_to_fix/test_zookeeper.py b/tests_to_fix/test_zookeeper.py
index 5e15b205..b2587de9 100644
--- a/tests_to_fix/test_zookeeper.py
+++ b/tests_to_fix/test_zookeeper.py
@@ -11,7 +11,8 @@
 # under the License.
 
 import unittest
-from StringIO import StringIO
+
+from six import StringIO
 
 from tests.common import get_check
 
diff --git a/tox.ini b/tox.ini
index 8fb66f45..831139c0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,pep8,cover
+envlist = py27,py36,pep8,cover
 minversion = 2.5
 skipsdist = True