部署之后报如下错误 怎么回事？

[heqingguo59520]

Complete!

Install Keystone is Done

3. Configure Keystone

Configure Keystone is Done

4. Configure HTTPD Server

Created symlink from /etc/systemd/system/multi-user.target.wants/httpd.service to /usr/lib/systemd/system/httpd.service.

Configure HTTPD is Done

5. Create a domain,project,user,and roles

Discovering versions from the identity service failed when creating the password plugin. Attempting to determine version from URL.
Service Unavailable (HTTP 503)

ERROR: OPENSTACK KEYSTONE INSTALLATION FAILED. ABORTING !!