Edit postgresql-7.0RC5/src/Makefile.global.in.  Change PG_KRB_SRVTAB to
somewhere useful for you, and PG_KRB_SRVNAM to whatever you want your
postgres kerberos service called.

make and install PostgreSQL.

Generate the keytab (PG_KRB_SRVTAB): kadmin% ank -randkey
postgres/server.my.domain.org kadmin% ktadd -k krb5.keytab
postgres/server.my.domain.org

Make sure the keytab is read-only to the postgres user. Make sure your
client binaries can see the new libraries.

edit pg_hba.conf and change the authentication method to krb5.

Everything should then work. If you use mod_auth_krb and mod_perl on
your web server, you can use AuthType KerberosV5SaveCredentials with a
mod_perl script. This gives secure database access over the web. No
extra passwords required. 

Mike Wyer <mw@doc.ic.ac.uk>