To run a zephyr server with MIT Kerberos support, you need to generate
a keytab for the principal zephyr/zephyr@YOUR.REALM.NAME.

Doing this with the MIT Kerberos V server is a slightly convoluted
process, but here we go:

[Note that this presumes that you have Kerberos administrator
privileges, if you don't, find someone who does.]

At the kadmin prompt, type

ank -randkey zephyr/zephyr

this creates the Kerberos principal, with whatever key types and
cryptosystems your realm defaults to.  Next, also at the kadmin
prompt, type the following substituting appropriately for your realm
name and various file locations:

xst -k /etc/zephyr/krb5.keytab zephyr/zephyr@YOUR.REALM.NAME

The keytab files need to be the same on all of your zephyr servers;
note that with the MIT kerberos server, xst changes the key each time,
invalidating previously-extracted keytabs.