pg_upgrade doesn't work if the 'postgres' database has been dropped in the old cluster:

~/pgsql.master$ bin/pg_upgrade -b ~/pgsql.91stable/bin -B bin/ -d ~/pgsql.91stable/data -D data-upgraded/
Performing Consistency Checks
-----------------------------
Checking current, bin, and data directories                 ok
Checking cluster versions                                   ok
Checking database user is a superuser                       ok
Checking for prepared transactions                          ok
Checking for reg* system OID user data types                ok
Checking for contrib/isn with bigint-passing mismatch       ok
Creating catalog dump                                       ok
Checking for prepared transactions                          ok

New cluster database "postgres" does not exist in the old cluster
Failure, exiting


That's a bit unfortunate. We have some other tools that don't work without the 'postgres' database, like 'reindexdb -all', but it would still be nice if pg_upgrade did.

--
  Heikki Linnakangas
  EnterpriseDB   http://www.enterprisedb.com

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