Re: Issue upgrading from 9.5 to 13 with pg_upgrade: "connection to database failed: FATAL: database "template1" does not exist" - Mailing list pgsql-general

> On Nov 13, 2020, at 10:23 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>
> Unless ... could it be that there is another PG server active on the
> machine, whose cluster lacks a "template1" database?  Seems unlikely,
> but you might try confirming with "ps auxww | grep post" or the like.

This is a test environment so only the two databases are on it and neither is running.  pg_upgrade checks if either is
running.

> I also wonder if the cluster you're trying to upgrade from has a
> "template1" database.  Not sure if anyone has ever tested whether
> pg_upgrade can cope with the lack of one.


It’s there:

$ psql -p 54320 template1
psql (13.0, server 9.5.23)
Type "help" for help.

template1=#