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If this is the case possible cause for this is either there is a second entry for connection in /etc/keystone/keystone.conf or some authentication problem .

To check that you can run the below commands

$ keystone-manage db_sync 2> stderr.log $ cat stderr.log 2014-04-29 10:31:17.072 35866 CRITICAL keystone [-] OperationalError: (OperationalError) (2005, "Unknown MySQL server host 'controller' (0)") None None