diff --git a/devops/helpers/ntp.py b/devops/helpers/ntp.py
index 871ecd03..333fa92e 100644
--- a/devops/helpers/ntp.py
+++ b/devops/helpers/ntp.py
@@ -12,10 +12,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import time
+import abc
 
-from devops.error import TimeoutError
-from devops.helpers.helpers import get_admin_ip
+from six import add_metaclass
+
+from devops.error import DevopsError
 from devops.helpers.helpers import get_admin_remote
 from devops.helpers.helpers import get_node_remote
 from devops.helpers.helpers import wait
@@ -45,40 +46,253 @@ def sync_time(env, node_names, skip_sync=False):
                 g_ntp.do_sync_time(g_ntp.other_ntps)
 
         all_ntps = g_ntp.admin_ntps + g_ntp.pacemaker_ntps + g_ntp.other_ntps
-        results = {ntp.node_name: ntp.date()[0].rstrip() for ntp in all_ntps}
+        results = {ntp.node_name: ntp.date for ntp in all_ntps}
 
     return results
 
 
+@add_metaclass(abc.ABCMeta)
+class AbstractNtp(object):
+
+    def __init__(self, remote, node_name):
+        self._remote = remote
+        self._node_name = node_name
+
+    def __repr__(self):
+        return "{0}(remote={1}, node_name={2!r})".format(
+            self.__class__.__name__, self.remote, self.node_name)
+
+    @property
+    def remote(self):
+        """remote object"""
+        return self._remote
+
+    @property
+    def node_name(self):
+        """node name"""
+        return self._node_name
+
+    @property
+    def date(self):
+        return self.remote.execute("date")['stdout'][0].rstrip()
+
+    @abc.abstractmethod
+    def start(self):
+        """Start ntp daemon"""
+
+    @abc.abstractmethod
+    def stop(self):
+        """Stop ntp daemon"""
+
+    @abc.abstractmethod
+    def set_actual_time(self, timeout=600):
+        """enforce time sync"""
+
+    @abc.abstractmethod
+    def wait_peer(self, interval=8, timeout=600):
+        """Wait for connection"""
+
+
+# pylint: disable=abstract-method
+# noinspection PyAbstractClass
+class BaseNtp(AbstractNtp):
+    """Base class for ntpd based services
+
+    Provides common methods:
+    - set_actual_time
+    - wait_peer
+    """
+
+    def set_actual_time(self, timeout=600):
+        # Get IP of a server from which the time will be synchronized.
+        srv_cmd = "awk '/^server/ && $2 !~ /^127\./ {print $2}' /etc/ntp.conf"
+        server = self.remote.execute(srv_cmd)['stdout'][0]
+
+        # Waiting for parent server until it starts providing the time
+        set_date_cmd = "ntpdate -p 4 -t 0.2 -bu {0}".format(server)
+        wait(lambda: not self.remote.execute(set_date_cmd)['exit_code'],
+             timeout=timeout,
+             timeout_msg='Failed to set actual time on node {!r}'.format(
+                 self._node_name))
+
+        self.remote.check_call('hwclock -w')
+
+    def _get_ntpq(self):
+        return self.remote.execute('ntpq -pn 127.0.0.1')['stdout'][2:]
+
+    def _get_sync_complete(self):
+        peers = self._get_ntpq()
+
+        logger.debug("Node: {0}, ntpd peers: {1}".format(
+            self.node_name, peers))
+
+        for peer in peers:
+            p = peer.split()
+            remote = str(p[0])
+            reach = int(p[6], 8)  # From octal to int
+            offset = float(p[8])
+            jitter = float(p[9])
+
+            # 1. offset and jitter should not be higher than 500
+            # Otherwise, time should be re-set.
+            if (abs(offset) > 500) or (abs(jitter) > 500):
+                continue
+
+            # 2. remote should be marked with tally  '*'
+            if remote[0] != '*':
+                continue
+
+            # 3. reachability bit array should have '1' at least in
+            # two lower bits as the last two successful checks
+            if reach & 3 != 3:
+                continue
+
+            return True
+        return False
+
+    def wait_peer(self, interval=8, timeout=600):
+        wait(self._get_sync_complete,
+             interval=interval,
+             timeout=timeout,
+             timeout_msg='Failed to wait peer on node {!r}'.format(
+                 self._node_name))
+
+# pylint: enable=abstract-method
+
+
+class NtpInitscript(BaseNtp):
+    """NtpInitscript."""  # TODO(ddmitriev) documentation
+
+    def __init__(self, remote, node_name):
+        super(NtpInitscript, self).__init__(remote, node_name)
+        get_ntp_cmd = \
+            "find /etc/init.d/ -regex '/etc/init.d/ntp.?' -executable"
+        result = remote.execute(get_ntp_cmd)
+        self._service = result['stdout'][0].strip()
+
+    def start(self):
+        self.remote.check_call("{0} start".format(self._service))
+
+    def stop(self):
+        self.remote.check_call("{0} stop".format(self._service))
+
+
+class NtpPacemaker(BaseNtp):
+    """NtpPacemaker."""  # TODO(ddmitriev) documentation
+
+    def start(self):
+        # Temporary workaround of the LP bug #1441121
+        self.remote.execute('ip netns exec vrouter ip l set dev lo up')
+
+        self.remote.execute('crm resource start p_ntp')
+
+    def stop(self):
+        self.remote.execute('crm resource stop p_ntp; killall ntpd')
+
+    def _get_ntpq(self):
+        return self.remote.execute(
+            'ip netns exec vrouter ntpq -pn 127.0.0.1')['stdout'][2:]
+
+
+class NtpSystemd(BaseNtp):
+    """NtpSystemd."""  # TODO(ddmitriev) documentation
+
+    def start(self):
+        self.remote.check_call('systemctl start ntpd')
+
+    def stop(self):
+        self.remote.check_call('systemctl stop ntpd')
+
+
+class NtpChronyd(AbstractNtp):
+    """Implements communication with chrony service
+
+    Reference: http://chrony.tuxfamily.org/
+    """
+
+    def start(self):
+        # No need to stop/start chronyd
+        # client can't work without daemon
+        pass
+
+    def stop(self):
+        # No need to stop/start chronyd
+        # client can't work without daemon
+        pass
+
+    def _get_burst_complete(self):
+        result = self._remote.check_call('chronyc -a activity')
+        stdout = result['stdout']
+        burst_line = stdout[4]
+        return burst_line == '0 sources doing burst (return to online)\n'
+
+    def set_actual_time(self, timeout=600):
+        # sync time
+        # 3 - good measurements
+        # 5 - max measurements
+        self._remote.check_call('chronyc -a burst 3/5')
+
+        # wait burst complete
+        wait(self._get_burst_complete, timeout=timeout,
+             timeout_msg='Failed to set actual time on node {!r}'.format(
+                 self._node_name))
+
+        # set system clock
+        self._remote.check_call('chronyc -a makestep')
+
+    def wait_peer(self, interval=8, timeout=600):
+        # wait for synchronization
+        # 10 - number of tries
+        # 0.01 - maximum allowed remaining correction
+        self._remote.check_call('chronyc -a waitsync 10 0.01')
+
+
 class GroupNtpSync(object):
     """Synchronize a group of nodes."""
 
+    @staticmethod
+    def get_ntp(remote, node_name):
+        # Detect how NTPD is managed - by init script or by pacemaker.
+        pcs_cmd = "ps -C pacemakerd && crm_resource --resource p_ntp --locate"
+        systemd_cmd = "systemctl list-unit-files| grep ntpd"
+        chronyd_cmd = "systemctl is-active chronyd"
+        initd_cmd = "find /etc/init.d/ -regex '/etc/init.d/ntp.?' -executable"
+
+        if remote.execute(pcs_cmd)['exit_code'] == 0:
+            # Pacemaker service found
+            return NtpPacemaker(remote, node_name)
+        elif remote.execute(systemd_cmd)['exit_code'] == 0:
+            return NtpSystemd(remote, node_name)
+        elif remote.execute(chronyd_cmd)['exit_code'] == 0:
+            return NtpChronyd(remote, node_name)
+        elif len(remote.execute(initd_cmd)['stdout']):
+            return NtpInitscript(remote, node_name)
+        else:
+            raise DevopsError('No suitable NTP service found on node {!r}'
+                              ''.format(node_name))
+
     def __init__(self, env, node_names):
         """Context manager for synchronize time on nodes
 
            param: env - environment object
            param: node_names - list of devops node names
         """
-        if not env:
-            raise Exception("'env' is not set, failed to initialize"
-                            " connections to {0}".format(node_names))
         self.admin_ntps = []
         self.pacemaker_ntps = []
         self.other_ntps = []
 
-        admin_ip = get_admin_ip(env)
-
         for node_name in node_names:
             if node_name == 'admin':
                 # 1. Add a 'Ntp' instance with connection to Fuel admin node
-                self.admin_ntps.append(
-                    Ntp.get_ntp(get_admin_remote(env), 'admin'))
+                admin_remote = get_admin_remote(env)
+                admin_ntp = self.get_ntp(admin_remote, 'admin')
+                self.admin_ntps.append(admin_ntp)
                 logger.debug("Added node '{0}' to self.admin_ntps"
                              .format(node_name))
                 continue
-            ntp = Ntp.get_ntp(get_node_remote(env, node_name),
-                              node_name, admin_ip)
-            if ntp.is_pacemaker:
+            remote = get_node_remote(env, node_name)
+            ntp = self.get_ntp(remote, node_name)
+            if isinstance(ntp, NtpPacemaker):
                 # 2. Create a list of 'Ntp' connections to the controller nodes
                 self.pacemaker_ntps.append(ntp)
                 logger.debug("Added node '{0}' to self.pacemaker_ntps"
@@ -93,215 +307,34 @@ class GroupNtpSync(object):
         return self
 
     def __exit__(self, exp_type, exp_value, traceback):
-        [ntp.remote.clear() for ntp in self.admin_ntps]
-        [ntp.remote.clear() for ntp in self.pacemaker_ntps]
-        [ntp.remote.clear() for ntp in self.other_ntps]
+        pass
 
-    def is_synchronized(self, ntps):
-        return all([ntp.is_synchronized for ntp in ntps])
-
-    def is_connected(self, ntps):
-        return all([ntp.is_connected for ntp in ntps])
-
-    def report_not_synchronized(self, ntps):
-        return [(ntp.node_name, ntp.last_error_msg, ntp.date())
-                for ntp in ntps if not ntp.is_synchronized]
-
-    def report_not_connected(self, ntps):
-        return [(ntp.node_name, ntp.last_error_msg, ntp.peers)
-                for ntp in ntps if not ntp.is_connected]
-
-    def report_node_names(self, ntps):
+    @staticmethod
+    def report_node_names(ntps):
         return [ntp.node_name for ntp in ntps]
 
     def do_sync_time(self, ntps):
-        # 0. 'ntps' can be filled by __init__() or outside the class
-        if not ntps:
-            raise ValueError("No servers were provided to synchronize "
-                             "the time in self.ntps")
-
         # 1. Stop NTPD service on nodes
         logger.debug("Stop NTPD service on nodes {0}"
                      .format(self.report_node_names(ntps)))
-        [ntp.stop() for ntp in ntps]
+        for ntp in ntps:
+            ntp.stop()
 
         # 2. Set actual time on all nodes via 'ntpdate'
         logger.debug("Set actual time on all nodes via 'ntpdate' on nodes {0}"
                      .format(self.report_node_names(ntps)))
-        [ntp.set_actual_time() for ntp in ntps]
-        if not self.is_synchronized(ntps):
-            raise TimeoutError("Time on nodes was not set with 'ntpdate':\n{0}"
-                               .format(self.report_not_synchronized(ntps)))
+        for ntp in ntps:
+            ntp.set_actual_time()
 
         # 3. Start NTPD service on nodes
         logger.debug("Start NTPD service on nodes {0}"
                      .format(self.report_node_names(ntps)))
-        [ntp.start() for ntp in ntps]
+        for ntp in ntps:
+            ntp.start()
 
         # 4. Wait for established peers
         logger.debug("Wait for established peers on nodes {0}"
                      .format(self.report_node_names(ntps)))
-        [ntp.wait_peer() for ntp in ntps]
 
-        if not self.is_connected(ntps):
-            raise TimeoutError("NTPD on nodes was not synchronized:\n"
-                               "{0}".format(self.report_not_connected(ntps)))
-
-
-class Ntp(object):
-    """Common methods to work with ntpd service."""
-
-    @staticmethod
-    def get_ntp(remote, node_name='node', admin_ip=None):
-
-        # Detect how NTPD is managed - by init script or by pacemaker.
-        pcs_cmd = "ps -C pacemakerd && crm_resource --resource p_ntp --locate"
-        systemd_cmd = "systemctl list-unit-files| grep ntpd"
-
-        if remote.execute(pcs_cmd)['exit_code'] == 0:
-            # Pacemaker service found
-            cls = NtpPacemaker()
-            cls.is_pacemaker = True
-        elif remote.execute(systemd_cmd)['exit_code'] == 0:
-            cls = NtpSystemd()
-            cls.is_pacemaker = False
-        else:
-            # Pacemaker not found, using native ntpd
-            cls = NtpInitscript()
-            cls.is_pacemaker = False
-            # Find upstart / sysv-init executable script
-            cmd = "find /etc/init.d/ -regex '/etc/init.d/ntp.?'"
-            cls.service = remote.execute(cmd)['stdout'][0].strip()
-
-        cls.is_synchronized = False
-        cls.is_connected = False
-        cls.remote = remote
-        cls.node_name = node_name
-        cls.peers = []
-        cls.last_error_msg = ''
-
-        # Get IP of a server from which the time will be synchronized.
-        cmd = "awk '/^server/ && $2 !~ /127.*/ {print $2}' /etc/ntp.conf"
-        cls.server = remote.execute(cmd)['stdout'][0]
-
-        # Speedup time synchronization for slaves that use admin node as a peer
-        if admin_ip:
-            cmd = ("sed -i 's/^server {0} .*/server {0} minpoll 3 maxpoll 5 "
-                   "iburst/' /etc/ntp.conf".format(admin_ip))
-            remote.execute(cmd)
-
-        return cls
-
-    def set_actual_time(self, timeout=600):
-        # Waiting for parent server until it starts providing the time
-        cmd = "ntpdate -p 4 -t 0.2 -bu {0}".format(self.server)
-        self.is_synchronized = False
-        try:
-            wait(lambda: not self.remote.execute(cmd)['exit_code'], timeout)
-            self.is_synchronized = True
-        except TimeoutError:
-            result = self.remote.execute(cmd)
-            self.last_error_msg = (
-                "Execution of the command '{cmd}' failed on the node "
-                "{node_name} with exit_code = {ec} : {stderr}"
-                .format(cmd=cmd, node_name=self.node_name,
-                        ec=result['exit_code'],
-                        stderr='\n'.join(result['stderr'])))
-            logger.debug(self.last_error_msg)
-
-        if self.is_synchronized:
-            self.remote.execute('hwclock -w')
-            self.last_error_msg = ''
-
-        return self.is_synchronized
-
-    def wait_peer(self, interval=8, timeout=600):
-        self.is_connected = False
-
-        start_time = time.time()
-        while start_time + timeout > time.time():
-            # peer = `ntpq -pn 127.0.0.1`
-            self.peers = self.get_peers()[2:]  # skip the header
-
-            self.last_error_msg = "Node: {0}, ntpd peers: {1}".format(
-                self.node_name, self.peers)
-            logger.debug(self.last_error_msg)
-
-            for peer in self.peers:
-                p = peer.split()
-                remote = str(p[0])
-                reach = int(p[6], 8)   # From octal to int
-                offset = float(p[8])
-                jitter = float(p[9])
-
-                # 1. offset and jitter should not be higher than 500
-                # Otherwise, time should be re-set.
-                if (abs(offset) > 500) or (abs(jitter) > 500):
-                    return self.is_connected
-
-                # 2. remote should be marked with tally  '*'
-                if remote[0] != '*':
-                    continue
-
-                # 3. reachability bit array should have '1' at least in
-                # two lower bits as the last two successful checks
-                if reach & 3 == 3:
-                    self.is_connected = True
-                    self.last_error_msg = ''
-                    return self.is_connected
-
-            time.sleep(interval)
-        return self.is_connected
-
-    def date(self):
-        return self.remote.execute("date")['stdout']
-
-
-class NtpInitscript(Ntp):
-    """NtpInitscript."""  # TODO(ddmitriev) documentation
-
-    def start(self):
-        self.is_connected = False
-        self.remote.execute("{0} start".format(self.service))
-
-    def stop(self):
-        self.is_connected = False
-        self.remote.execute("{0} stop".format(self.service))
-
-    def get_peers(self):
-        return self.remote.execute('ntpq -pn 127.0.0.1')['stdout']
-
-
-class NtpPacemaker(Ntp):
-    """NtpPacemaker."""  # TODO(ddmitriev) documentation
-
-    def start(self):
-        self.is_connected = False
-
-        # Temporary workaround of the LP bug #1441121
-        self.remote.execute('ip netns exec vrouter ip l set dev lo up')
-
-        self.remote.execute('crm resource start p_ntp')
-
-    def stop(self):
-        self.is_connected = False
-        self.remote.execute('crm resource stop p_ntp; killall ntpd')
-
-    def get_peers(self):
-        return self.remote.execute(
-            'ip netns exec vrouter ntpq -pn 127.0.0.1')['stdout']
-
-
-class NtpSystemd(Ntp):
-    """NtpSystemd."""  # TODO(ddmitriev) documentation
-
-    def start(self):
-        self.is_connected = False
-        self.remote.execute('systemctl start ntpd')
-
-    def stop(self):
-        self.is_connected = False
-        self.remote.execute('systemctl stop ntpd')
-
-    def get_peers(self):
-        return self.remote.execute('ntpq -pn 127.0.0.1')['stdout']
+        for ntp in ntps:
+            ntp.wait_peer()