I have Open-Stack with Red Hat Linux. In the Dashboard, when I create an instance from an image or a volume, I get an error: task status not updating and stating at "scheduling", or "local host not found". Can you help resolve the problem and provide the detailed procedure to create an instance?

2014-06-26 13:43:43.790 15386 INFO nova.openstack.common.periodic_task [-] Skipping periodic task _periodic_update_dns because its interval is negative
2014-06-26 13:43:43.852 15386 AUDIT nova.service [-] Starting scheduler node (version 2014.1.1-1.el6)
2014-06-26 13:43:45.090 15386 INFO oslo.messaging._drivers.impl_rabbit [-] Connected to AMQP server on 192.34.76.101:5672
2014-06-26 13:53:40.821 15386 WARNING nova.openstack.common.db.sqlalchemy.session [-] Database server has gone away: (2006, 'MySQL server has gone away')
2014-06-26 13:53:40.824 15386 ERROR nova.servicegroup.drivers.db [-] model server went away
2014-06-26 13:53:40.824 15386 TRACE nova.servicegroup.drivers.db Traceback (most recent call last):
2014-06-26 13:53:40.824 15386 TRACE nova.servicegroup.drivers.db   File "/usr/lib/python2.6/site-packages/nova/servicegroup/drivers/db.py", line 95, in _report_state
2014-06-26 13:53:40.824 15386 TRACE nova.servicegroup.drivers.db     service.service_ref, state_catalog)
2014-06-26 13:53:40.824 15386 TRACE nova.servicegroup.drivers.db   File "/usr/lib/python2.6/site-packages/nova/conductor/api.py", line 218, in service_update
2014-06-26 13:53:40.824 15386 TRACE nova.servicegroup.drivers.db     return self._manager.service_update(context, service, values)
2014-06-26 13:53:40.824 15386 TRACE nova.servicegroup.drivers.db   File "/usr/lib/python2.6/site-packages/nova/utils.py", line 966, in wrapper
2014-06-26 13:53:40.824 15386 TRACE nova.servicegroup.drivers.db     return func(*args, **kwargs)
2014-06-26 13:53:40.824 15386 TRACE nova.servicegroup.drivers.db   File "/usr/lib/python2.6/site-packages/oslo/messaging/rpc/server.py", line 139, in inner
2014-06-26 13:53:40.824 15386 TRACE nova.servicegroup.drivers.db     return func(*args, **kwargs)
2014-06-26 13:53:40.824 15386 TRACE nova.servicegroup.drivers.db   File "/usr/lib/python2.6/site-packages/nova/conductor/manager.py", line 491, in service_update
2014-06-26 13:53:40.824 15386 TRACE nova.servicegroup.drivers.db     svc = self.db.service_update(context, service['id'], values)
2014-06-26 13:53:40.824 15386 TRACE nova.servicegroup.drivers.db   File "/usr/lib/python2.6/site-packages/nova/db/api.py", line 148, in service_update
2014-06-26 13:53:40.824 15386 TRACE nova.servicegroup.drivers.db     return IMPL.service_update(context, service_id, values)
2014-06-26 13:53:40.824 15386 TRACE nova.servicegroup.drivers.db   File "/usr/lib/python2.6/site-packages/nova/db/sqlalchemy/api.py", line 146, in wrapper
2014-06-26 13:53:40.824 15386 TRACE nova.servicegroup.drivers.db     return f(*args, **kwargs)
2014-06-26 13:53:40.824 15386 TRACE nova.servicegroup.drivers.db   File "/usr/lib/python2.6/site-packages/nova/db/sqlalchemy/api.py", line 532, in service_update
2014-06-26 13:53:40.824 15386 TRACE nova.servicegroup.drivers.db     with_compute_node=False, session=session)
2014-06-26 13:53 ...