principal in kerberos

Hi,
To see if i understood.
ktutil
ktutil: read_kt /etc/krb5.keytab
ktutil: list
slot KVNO Principal
Code:---- ---- ---------------------------------------------------------------------
1 26 host/y.test.com@TEST.COM
2 26 host/y@TEST.NET
3 26 host/y.test.com@TEST.COM
4 26 host/Y@TEST.COM
5 26 host/y.test.com@TEST.COMFrom the above i see only host principal and no user principal.
No user principal is in krb5.keytab.right?
This means that when this server boots it will receive a tgt for this server principal.right?
Then with kinit admin i obtain the tgt for user admin from kdc?
I can change the user admin password with passwd or kpasswd?