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Date: Mon, 22 Apr 2024 14:49:26 -0700
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Subject: Re: issue with reading hostname
To: Atul Kumar <akumar14871@gmail.com>
Cc: pgsql-general <pgsql-general@postgresql.org>
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From: Adrian Klaver <adrian.klaver@aklaver.com>
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On 4/22/24 14:37, Atul Kumar wrote:
> Can we edit the socket to change the hostname in it ?

On Ubuntu 22.04 install, given:

srwxrwxrwx  1 postgres postgres    0 Apr 22 14:01 .s.PGSQL.5432=
-rw-------  1 postgres postgres   68 Apr 22 14:01 .s.PGSQL.5432.lock

The contents of .s.PGSQL.5432.lock(the file that indicates a Postgres 
instance has a lock on the socket) are:

862
/var/lib/postgresql/15/main
1713795311
5432
/var/run/postgresql

There is no hostname to be changed as you are working with a local socket.

> 
> Regards.
> 
> On Tue, Apr 23, 2024 at 2:41 AM Ron Johnson <ronljohnsonjr@gmail.com 
> <mailto:ronljohnsonjr@gmail.com>> wrote:
> 
>     On Mon, Apr 22, 2024 at 4:14 PM Atul Kumar <akumar14871@gmail.com
>     <mailto:akumar14871@gmail.com>> wrote:
> 
>         Hi,
> 
>         I have postgresql  version 15 running on centos7.
> 
>         I have below query that reads hostname from /tmp directory:
> 
>         psql postgres -A -t -p 5432 -h /tmp/ -c 'SELECT
>         pg_is_in_recovery();'
> 
> 
>     If you installed from the PGDG repository (possibly also the CENTOS
>     repos, but I'm not sure), then the domain socket also lives in :
>     /var/run/postgresql
> 
>     * I find that more expressive than /tmp.
>     * No need to specify the host when using sockets.
>     * Using a socket name makes parameterizing the hostname easier in
>     scripts.
> 
> 

-- 
Adrian Klaver
adrian.klaver@aklaver.com