Re: Capturing both IP address and hostname in the log

On 4/10/25 05:22, Tefft, Michael J wrote:
> The documentation for log_hostname says:
>
> log_hostname (boolean)
>
> By default, connection log messages only show the IP address of the
> connecting host. Turning this parameter on causes logging of the host
> name as well. Note that depending on your host name resolution setup
> this might impose a non-negligible performance penalty. This parameter
> can only be set in the postgresql.conf file or on the server command line.
>
> https://www.postgresql.org/docs/14/runtime-config-logging.html
> <https://www.postgresql.org/docs/14/runtime-config-logging.html>
>
> We have set log_hostname ON and we get hostname reported – but we do not
> get IP address. We would like to capture both.
>
> Since the doc says “Turning this parameter on causes logging of the host
> name **as well**” we were hoping we would capture both, but we are not
> getting what we expect.
>
> Is there a way to capture both IP address and hostname in the log
> messages? Or must we choose “one or the ootehr”?

I see the same thing. It seems either or.

>
> Thanks,
>
> Mike Tefft
>
> (We are using PG14 and PG16, but the docs say the same thing, as does PG17)
>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com