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Subject: Re: postgresql definitive list of network resources used/needed?
From: Scott Ribe <scott_ribe@elevated-dev.com>
In-Reply-To: 
 <CAGA3vBstbWk88KvfJD0WzR89omKy9v+P_Z-S4p=_HC0g-xR58w@mail.gmail.com>
Date: Wed, 10 Aug 2022 15:24:38 -0600
Cc: pgsql-admin@postgresql.org
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Message-Id: <200DE464-2992-4D0C-96F1-6656E1CE932A@elevated-dev.com>
References: 
 <CAGA3vBstbWk88KvfJD0WzR89omKy9v+P_Z-S4p=_HC0g-xR58w@mail.gmail.com>
To: richard coleman <rcoleman.ascentgl@gmail.com>
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 <https://www.postgresql.org/message-id/200DE464-2992-4D0C-96F1-6656E1CE932A%40elevated-dev.com>
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> On Aug 10, 2022, at 3:08 PM, richard coleman =
<rcoleman.ascentgl@gmail.com> wrote:
>=20
> I'm currently standing up a number of PostgreSQL 14 servers.  There is =
a question concerning ports and protocols required or used by =
PostgreSQL.  Unfortunately, I can't seem to find any such listing.  Most =
references only mention the primary connection port, ex: tcp 5432. =20

There is whatever port you configure it for; the default is 5432.

> Apparently, I've discovered that PostgreSQL connects to itself over =
UDP. =20

No it doesn't. (It can use Unix domain sockets for local connections.)

> I've also discovered, while looking at the network while one of our =
server was running PostgreSQL, that while there were a number of =
connections between local 5432 and a random remote port, there was also =
a connection from a local random port to a remote 5432.  If these ports =
were closed and only 5432 left open, this connection would have failed.

That sounds like you're confused by the fact that when a client connects =
to a server, the server port is fixed, but the client chooses a random =
outbound port.

> Does anyone know where I might find the definitive listing of ports =
and protocols used by PostgreSQL?

TCP, whatever port you configure it listen on.