On Tue, 2024-10-29 at 16:30 +0000, Daniel Westermann (DWE) wrote:
> we're facing a strange issue with delays between "connection received" and 
> "connection authenticated".
> 
> # select version();
>                                                               version
> -----------------------------------------------------------------------------------------------------------------------------------
>  PostgreSQL 15.6 (Ubuntu 15.6-1.pgdg22.04+1) on x86_64-pc-linux-gnu, compiled 
> by gcc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0, 64-bit
> (1 ligne)
> 
> I know, this is not the latest minor version.
> 
> # \! cat /etc/os-release | head -1
> PRETTY_NAME="Ubuntu 22.04.4 LTS"
> 
> What we see in the log is this (around 4 seconds delay):
> 
> 2024-05-07 15:29:50.244 CEST [369909] LOG:  connection received: 
> host=xx.xx.xx.100 port=48434
> 2024-05-07 15:29:54.518 CEST [369909] LOG:  connection authenticated: 
> identity="xxxxxx" method=md5 (/etc/postgresql/15/main/pg_hba.conf:121)
> 
> The matching line is this ( I know md5 ):
> host    all             xxxxx     xx.xx.xx.0/24            md5
> 
> What we've found out so far is, that this only happens if we have a 
> localhost(or any other hostname) line before the line matching our 
> connection, something like this:
> host    replication     xxxxx     localhost                md5
> host    all             xxxxx     xx.xx.xx.0/24            md5

I'd "strace" such a database connection to see where the time is spent.

Yours,
Laurenz Albe

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