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Message-ID: <03a52ff9-6732-4197-bd6c-728eb862098d@aklaver.com>
Date: Wed, 9 Apr 2025 13:45:42 -0700
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Subject: Re: [EXTERNAL] Re: Cannot connect local with ttrust (pg_upgrade
 assumes it)
To: "Abraham, Danny" <danny_abraham@bmc.com>,
 "David G. Johnston" <david.g.johnston@gmail.com>,
 Francisco Olarte <folarte@peoplecall.com>,
 "pgsql-general@lists.postgresql.org" <pgsql-general@lists.postgresql.org>
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From: Adrian Klaver <adrian.klaver@aklaver.com>
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On 4/9/25 13:40, Abraham, Danny wrote:
> Thanks again.
> 
>  1. No other PG instances on this Linux machine.
>  2. RHEL9
>  3. Our compiled PG which is embedded within our product/site
>  4. I am not aware of an env variable that changes the top down matching
>     on pg_hba.conf

 From here:

https://www.postgresql.org/docs/current/libpq-envars.html

"The following environment variables can be used to select default 
connection parameter values, which will be used by PQconnectdb, 
PQsetdbLogin and PQsetdb if no value is directly specified by the 
calling code.

PGHOST behaves the same as the host connection parameter.

...
"

So if you have PGHOST set to say localhost it would be added to:

psql -Upostgres

> 
> Danny
> 
> *From:*David G. Johnston <david.g.johnston@gmail.com>
> *Sent:* Wednesday, April 9, 2025 10:34 PM
> *To:* Abraham, Danny <danny_abraham@bmc.com>
> *Cc:* Adrian Klaver <adrian.klaver@aklaver.com>; Francisco Olarte 
> <folarte@peoplecall.com>; pgsql-general@lists.postgresql.org
> *Subject:* Re: [EXTERNAL] Re: Cannot connect local with ttrust 
> (pg_upgrade assumes it)
> 
> On Wed, Apr 9, 2025, 12:21 Abraham, Danny <danny_abraham@bmc.com 
> <mailto:danny_abraham@bmc.com>> wrote:
> 
>     Thanks again.
>     Here is the example:
>      >>>>>>>>
>     dba-tlv-x6y64k% cat pg_hba.conf
>     # TYPE  DATABASE    USER        CIDR-ADDRESS          METHOD
>     local   all         all                               trust
>     host    all         all 0.0.0.0/0
>     <https://urldefense.com/v3/__http:/0.0.0.0/0__;!!PEZBYkTc!e_x_LCIABYSpqVum5S6Hr0TtEs6P4NaumHqEqyXEa3ErrZTPMmnUeC33JmyNsqr1kGf2DxtZKMbJ_ofkSSjZQC4hsuUN$>                   scram-sha-256
> 
>     dba-tlv-x6y64k% pg_ctl reload
>     server signaled
>     dba-tlv-x6y64k% psql -Upostgres
>     Password for user postgres:
>     psql (17.4)
>     Type "help" for help.
> 
>     ctrlmdb=#
>      >>>>>>>
>     PSQL should not have asked for the password.
>     Thanks
>     Danny
> 
> Suggests there are environment variables coming into play making 
> non-default choices for you.  Namely, making you not use local as the 
> connection method.
> 
> David J.
> 

-- 
Adrian Klaver
adrian.klaver@aklaver.com