Openstack Juno + Docker error "Docker daemon is not running or is not reachable"

I was getting following error while integrating docker with Openstack Juno.

"2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup     _('Docker daemon is not running or is not reachable'
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup NovaException: Docker daemon is not running or is not reachable (check the rights on /var/run/docker.sock)"

I tried changing the permission of the docker.sock but that didn't help. But when I upgraded the docker to 1.2 version the issue was fixed . The docker version which comes with centos is little bit old we can the rpm of new docker for centos7 from 

Download the following RPMS 

wget http://cbs.centos.org/kojifiles/packages/docker/1.2.0/4.el7.centos/x86_64/docker-1.2.0-4.el7.centos.x86_64.rpm
wget http://cbs.centos.org/kojifiles/packages/docker/1.2.0/4.el7.centos/x86_64/docker-devel-1.2.0-4.el7.centos.x86_64.rpm
wget http://cbs.centos.org/kojifiles/packages/docker/1.2.0/4.el7.centos/x86_64/docker-pkg-devel-1.2.0-4.el7.centos.x86_64.rpm

Install the RPM

in the same dorectory
yum install docker-1.2.0
yum install docker*


Error
====
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup Traceback (most recent call last):
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/openstack/common/threadgroup.py", line 125, in wait
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup     x.wait()
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/openstack/common/threadgroup.py", line 47, in wait
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup     return self.thread.wait()
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/eventlet/greenthread.py", line 173, in wait
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup     return self._exit_event.wait()
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/eventlet/event.py", line 121, in wait
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup     return hubs.get_hub().switch()
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/eventlet/hubs/hub.py", line 293, in switch
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup     return self.greenlet.switch()
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/eventlet/greenthread.py", line 212, in main
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup     result = function(*args, **kwargs)
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/openstack/common/service.py", line 492, in run_service
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup     service.start()
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/service.py", line 164, in start
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup     self.manager.init_host()
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1125, in init_host
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup     self.driver.init_host(host=self.host)
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup   File "/etc/nova/src/novadocker/novadocker/virt/docker/driver.py", line 82, in init_host
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup     _('Docker daemon is not running or is not reachable'
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup NovaException: Docker daemon is not running or is not reachable (check the rights on /var/run/docker.sock)
2014-10-20 14:24:21.940 2987 TRACE nova.openstack.common.threadgroup
2014-10-20 14:24:22.876 2995 INFO oslo.messaging._drivers.impl_rabbit [req-aadcbda1-ccd1-4b49-8dac-43ce49afa0fa ] Connecting to AMQP server on controller:5672
2014-10-20 14:24:22.901 2995 INFO oslo.messaging._drivers.impl_rabbit [req-aadcbda1-ccd1-4b49-8dac-43ce49afa0fa ] Connected to AMQP server on controller:5672
2014-10-20 14:24:22.906 2995 INFO oslo.messaging._drivers.impl_rabbit [req-aadcbda1-ccd1-4b49-8dac-43ce49afa0fa ] Connecting to AMQP server on controller:5672
2014-10-20 14:24:22.919 2995 INFO oslo.messaging._drivers.impl_rabbit [req-aadcbda1-ccd1-4b49-8dac-43ce49afa0fa ] Connected to AMQP server on controller:5672
2014-10-20 14:24:22.954 2995 ERROR nova.openstack.common.threadgroup [-] Docker daemon is not running or is not reachable (check the rights on /var/run/docker.sock)
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup Traceback (most recent call last):
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/openstack/common/threadgroup.py", line 125, in wait
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup     x.wait()
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/openstack/common/threadgroup.py", line 47, in wait
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup     return self.thread.wait()
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/eventlet/greenthread.py", line 173, in wait
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup     return self._exit_event.wait()
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/eventlet/event.py", line 121, in wait
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup     return hubs.get_hub().switch()
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/eventlet/hubs/hub.py", line 293, in switch
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup     return self.greenlet.switch()
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/eventlet/greenthread.py", line 212, in main
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup     result = function(*args, **kwargs)
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/openstack/common/service.py", line 492, in run_service
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup     service.start()
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/service.py", line 164, in start
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup     self.manager.init_host()
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 1125, in init_host
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup     self.driver.init_host(host=self.host)
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup   File "/etc/nova/src/novadocker/novadocker/virt/docker/driver.py", line 82, in init_host
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup     _('Docker daemon is not running or is not reachable'
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup NovaException: Docker daemon is not running or is not reachable (check the rights on /var/run/docker.sock)
2014-10-20 14:24:22.954 2995 TRACE nova.openstack.common.threadgroup