How to set the Kerberos default_ccache_name attribute on a client without using KRB5CCNAME?
Drat, I think I found my own answer -- version 1.9.4 doesn't have this parameter:
http://web.mit.edu/kerberos/www/krb5-1.9/krb5-1.9.4/doc/krb5-admin.html
It would help to look in the right documentation...