Hi community!
 
1. Is it possible to configure SSO to the guest virtual machine without graphical desktop environment?
The documentation indicates that the graphical desktop environment is required - https://ovirt.org/documentation/vmm-guide/chap-Additional_Configuration/
 
2. Is it possible to configure SSO on the guest virtual machine with CentOS 6?
The required modules are only available for CentOS 7:
 
ovirt-guest-agent-pam-module
ovirt-guest-agent-gdm-plugin