Sorry I don't run centos but you will need the consoleauth service running to use vnc-console.
Maybe this is a packaging issue with centos or maybe you need to install a new package in centos that include nova-consoleauth
Sorry I don't run centos but you will need the consoleauth service running to use vnc-console.
Maybe this is a packaging issue with centos or maybe you need to install a new package in centos that include nova-consoleauth