Cannot determine realm for host

Problem

When running kinit using a keytab as input, kinit outputs this error message:

# kinit -k -t /tmp/drum00host.keytab 
kinit: Cannot determine realm for host (principal host/drum00.orchestra.cse.unsw.edu.au@)

Cause

kinit wants to authenticate the host on which it is running with the Kerberos server appropriate for the realm. It needs to work out what that realm is and cannot.

Fixing the problem

Add an appropriate line to /etc/krb5.conf (such as the underlined) like this:

[domain_realm]
 .cse.unsw.edu.au = AD.UNSW.EDU.AU
 .ad.unsw.edu.au = AD.UNSW.EDU.AU
 ad.unsw.edu.au = AD.UNSW.EDU.AU

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