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Re: Delays between "connection received" and "connection authenticated" because of localhost entries in hba 3+ messages / 2 participants [nested] [flat]
* Re: Delays between "connection received" and "connection authenticated" because of localhost entries in hba @ 2024-10-29 16:38 Adrian Klaver <[email protected]> 2024-10-29 17:42 ` Re: Delays between "connection received" and "connection authenticated" because of localhost entries in hba Daniel Westermann (DWE) <[email protected]> 0 siblings, 1 reply; 3+ messages in thread From: Adrian Klaver @ 2024-10-29 16:38 UTC (permalink / raw) To: Daniel Westermann (DWE) <[email protected]>; [email protected] <[email protected]> On 10/29/24 09:30, Daniel Westermann (DWE) wrote: > Delays between "connection received" and "connection authenticated" because of localhost entries in hba > > Hi, > > 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) 1) host=xx.xx.xx.100 = localhost? 2) In postgresql.conf what is listen_addresses set to? 3) What are the settings in /etc/hosts? > > 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 > > We don't see it if we do it like this: > host all xxxxx xx.xx.xx.0/24 md5 > host replication xxxxx localhost md5 > > Has anyone experienced such a behavior? It seems clear that this is somehow related to name resolution but we couldn't reproduce something like this on the OS using dig (in a loop several hundred of times). It is also only happening from time to time, and not constantly. > > What we're basically looking for is a way to prove the assumption without involving PostgreSQL at all, if that does make sense? > > Many thanks in advance > Daniel > > -- Adrian Klaver [email protected] ^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: Delays between "connection received" and "connection authenticated" because of localhost entries in hba 2024-10-29 16:38 Re: Delays between "connection received" and "connection authenticated" because of localhost entries in hba Adrian Klaver <[email protected]> @ 2024-10-29 17:42 ` Daniel Westermann (DWE) <[email protected]> 2024-10-29 18:03 ` Re: Delays between "connection received" and "connection authenticated" because of localhost entries in hba Adrian Klaver <[email protected]> 0 siblings, 1 reply; 3+ messages in thread From: Daniel Westermann (DWE) @ 2024-10-29 17:42 UTC (permalink / raw) To: Adrian Klaver <[email protected]>; [email protected] <[email protected]> > 1) host=xx.xx.xx.100 = localhost? No, it is not > 2) In postgresql.conf what is listen_addresses set to? * > 3) What are the settings in /etc/hosts? Standard Ubuntu settings: 127.0.0.1 localhost 127.0.1.1 abc cde # The following lines are desirable for IPv6 capable hosts ::1 localhost ip6-localhost ip6-loopback ff02::1 ip6-allnodes ff02::2 ip6-allrouters Regards Daniel ^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: Delays between "connection received" and "connection authenticated" because of localhost entries in hba 2024-10-29 16:38 Re: Delays between "connection received" and "connection authenticated" because of localhost entries in hba Adrian Klaver <[email protected]> 2024-10-29 17:42 ` Re: Delays between "connection received" and "connection authenticated" because of localhost entries in hba Daniel Westermann (DWE) <[email protected]> @ 2024-10-29 18:03 ` Adrian Klaver <[email protected]> 0 siblings, 0 replies; 3+ messages in thread From: Adrian Klaver @ 2024-10-29 18:03 UTC (permalink / raw) To: Daniel Westermann (DWE) <[email protected]>; [email protected] <[email protected]> On 10/29/24 10:42 AM, Daniel Westermann (DWE) wrote: >> 1) host=xx.xx.xx.100 = localhost? > > No, it is not Is the localhost machine on the same network? Is the client connection string using IPV4 address or host name? > >> 2) In postgresql.conf what is listen_addresses set to? > > * > >> 3) What are the settings in /etc/hosts? > > Standard Ubuntu settings: > > 127.0.0.1 localhost > 127.0.1.1 abc cde > > # The following lines are desirable for IPv6 capable hosts > ::1 localhost ip6-localhost ip6-loopback > ff02::1 ip6-allnodes > ff02::2 ip6-allrouters Contents of resolv.conf? Would it be possible to crank the logging detail up? > > Regards > Daniel -- Adrian Klaver [email protected] ^ permalink raw reply [nested|flat] 3+ messages in thread
end of thread, other threads:[~2024-10-29 18:03 UTC | newest] Thread overview: 3+ messages (download: mbox mbox.gz follow: Atom feed) -- links below jump to the message on this page -- 2024-10-29 16:38 Re: Delays between "connection received" and "connection authenticated" because of localhost entries in hba Adrian Klaver <[email protected]> 2024-10-29 17:42 ` Daniel Westermann (DWE) <[email protected]> 2024-10-29 18:03 ` Adrian Klaver <[email protected]>
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