比較開發環境後發現缺少了"keystone-paste.ini". 將其複製至/etc/keystone 下重起即可.
[root@controller keystone]# service openstack-keystone start
Starting keystone: [FAILED]
[root@controller keystone]# cat /var/log/keystone/keystone-startup.log
2014-09-20 21:27:17.086 12404 CRITICAL keystone [-] ConfigFileNotFound: An unexpected error prevented the server from fulfilling your request.
Starting keystone: [FAILED]
[root@controller keystone]# cat /var/log/keystone/keystone-startup.log
2014-09-20 21:27:17.086 12404 CRITICAL keystone [-] ConfigFileNotFound: An unexpected error prevented the server from fulfilling your request.
**Need to get a "keystone-paste.ini" file and copy it into /etc/keystone/
Starting keystone: [ OK ]