How to disable ambari-server kerberos

[Fay Wang]

Hi,    I enabled kerberos for my cluster (via ambari UI) and for ambari-server 
(using ambari-server setup-security). I can disable kerberos for the cluster 
via Ambari UI, but am not sure how to disable kerberos for the ambari-server. 
    Is it ok to have kerberized abmari-server in a non-kerberized cluster? If 
not, how to disable kerberos for ambari-server?
   Any help is greatly appreciated!
-fay