public inbox for [email protected]  

help / color / mirror / Atom feed

From: David G. Johnston <[email protected]>
To: Tefft, Michael J <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: Capturing both IP address and hostname in the log
Date: Thu, 10 Apr 2025 09:33:39 -0700
Message-ID: <CAKFQuwauokoz4iDabgj_YkGixLpRWsfSu+CxDFVOA5xRbM7Uxg@mail.gmail.com> (raw)
In-Reply-To: <BN8PR04MB550874EE58EC715656C3D3D2D0B72@BN8PR04MB5508.namprd04.prod.outlook.com>
References: <BN8PR04MB550874EE58EC715656C3D3D2D0B72@BN8PR04MB5508.namprd04.prod.outlook.com>

On Thu, Apr 10, 2025 at 5:22 AM Tefft, Michael J <[email protected]>
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
>
>
>
Yeah, the wording really should be more like:

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index fea683cb49..c545fee6c9 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -7614,10 +7614,11 @@ local0.*    /var/log/postgresql
       </term>
       <listitem>
        <para>
-        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.
+        By default, for TCP/IP-originated connections, the identifier of
the host
+        making the connection is its IP address.  Turning this parameter
on tells
+        the system to record the resolved host name instead.  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
<filename>postgresql.conf</filename>
         file or on the server command line.
        </para>


Both the connection logging routine and log_line_prefix %h / %r simply
report the "identifier of the host making the connection".

David J.

view thread (6+ messages)  latest in thread

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: [email protected]
  Cc: [email protected], [email protected], [email protected]
  Subject: Re: Capturing both IP address and hostname in the log
  In-Reply-To: <CAKFQuwauokoz4iDabgj_YkGixLpRWsfSu+CxDFVOA5xRbM7Uxg@mail.gmail.com>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox