Openstack login dashboard prompt authentication error

First of all to see httpd and keystone Log file tail /var/log/httpd/error.log tail /var/log/keystone/keystone.log

HTTP Tips admin Login error , however keystone According to the normal , Let's check dashboard Configuration file for ,

vi /etc/openstack-dashboard/local_settings 

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Check the configuration file Find out OPENSTACK_HOST = "" No data filled in

Fill in data

OPENSTACK_HOST = "controller"

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Restart again httpd and memcached service , Landing again , Normal login succeeded