Re: Fwd: Postgresql with nextcloud in Windows Server

[김준형 <wnsuddlsla@xxxxxxxxx>]

Sorry for late but my server works without problem for a while.

> What problem occurs?
> Where is the Windows server?  

Problem means Windows server doesn't accept new connection and non-admin connection.

Only connected admin connection lives.

Windows server is not so close on my work space. So I use Windows server with remote connection.

> Not sure you know that if you cannot connect to the Windows server?

I know I cannot connect to the Windows server but sometimes I got remote connection of admin when occurred connection problem.

That time, I had tried to stop the PostgreSQL server but It didn't work.

At last, I leave logs what I got.

1) The Windows system logs

1096 Process closing UDP socket with local port number 64347 is running longer than expected. The local port number can not be used until the close operation is completed. This problem is usually caused by malfunctioning network drivers. Make sure you have the latest updates for third-party networking software, including Windows and NIC drivers, firewalls, and other security products.

2) PostgreSQL logs

...

2019-04-06 04:34:03.984 KST [129704] LOG:  connection received: host=128.1.99.51 port=40602

2019-04-06 04:34:03.990 KST [129704] LOG:  connection authorized: user=oc_abmiadmin database=abminext

2019-04-06 04:34:05.117 KST [129720] LOG:  connection received: host=128.1.99.51 port=40604

2019-04-06 04:34:05.125 KST [129720] LOG:  connection authorized: user=oc_abmiadmin database=abminext

2019-04-06 04:34:05.125 KST [129720] FATAL:  remaining connection slots are reserved for non-replication superuser connections

2019-04-06 04:34:05.171 KST [129736] LOG:  connection received: host=128.1.99.51 port=40606

2019-04-06 04:34:05.179 KST [129736] LOG:  connection authorized: user=oc_abmiadmin database=abminext

2019-04-06 04:34:05.179 KST [129736] FATAL:  remaining connection slots are reserved for non-replication superuser connections

...

p.s) PostgreSQL max_connections =1200. Is there problem in here?

2019년 4월 2일 (화) 오후 11:30, Adrian Klaver <adrian.klaver@xxxxxxxxxxx>님이 작성:

On 4/1/19 10:03 PM, 김준형 wrote:
>
> 보낸사람: *김준형* <wnsuddlsla@xxxxxxxxx <mailto:wnsuddlsla@xxxxxxxxx>>
> Date: 2019년 4월 2일 (화) 오후 2:02
> Subject: Re: Postgresql with nextcloud in Windows Server
> To: Adrian Klaver <adrian.klaver@xxxxxxxxxxx
> <mailto:adrian.klaver@xxxxxxxxxxx>>
>
>
> Thanks for your reply and I hope this answers can help your questions
>
> 1) The nextcloud is running on PostgreSQL server. Cloud system needs
> PostgreSQL server.

Well I got that backwards. Forget that Nextcloud is an ownCloud fork.

>
> 2) Nextcloud system try to connect PostgreSQL server all time.
> 2019-03-27 20:46:59.396 LOG:  connection received: host=xxx.xxx.xxx.xxx
> port=xxxx
> 2019-03-27 20:46:59.403 LOG:  connection authorized: user=user_name
> database=db_name
> 2019-03-27 20:46:59.463 LOG:  disconnection: session time: 0:00:00.067
> user=user_name database=db_name host=xxx.xxx.xxx.xxx port=xxxx
> this connections repeat almost per 10sec.
> Other clients well... use this PostgreSQL but not so much.(almost 30
> people use this PostgreSQL include nextcloud system users)

There is nothing unusual about the above, just shows a client
successfully connecting and then disconnecting. I set up an ownCloud
server years ago as a test and as I remember it was constantly talking
to the Postgres server. In postgresql.conf you could set log_statement =
'all' to see what is actually being done by the client(s). Just be aware
this will generate a lot of logs so you probably want to do this for
short period only.

>
>
> 3) Yes. log files doesn't shows problems clearly. I just checked log
> files and saw difference when server couldn't connected.
> 2019-03-27 20:46:59.396 LOG:  connection received: host=xxx.xxx.xxx.xxx
> port=xxxx
> 2019-03-27 20:46:59.403 LOG:  connection authorized: user=user_name
> database=db_name
> this log repeated and no disconnection log.

This shows a successful connection. The disconnection maybe much further
in the future or has not happened at all. To see current connections
select from pg_stat_activity:

www.postgresql.org/docs/11/monitoring-stats.html#PG-STAT-ACTIVITY-VIEW

>
> 4) After problem occur, if try to connect to windows server, windows
> remote access shows time-out error. PostgreSQL server also too.

What problem occurs?
Where is the Windows server?

>
> 5) Before the server doesn't work normally, there is no problem to use
> PostgreSQL (even nextcloud system, too.)
>
> 6) No, It doesn't work. PostgreSQL service status doesn't changed.

Not sure you know that if you cannot connect to the Windows server?

>
> 7) When I restart server, I check PostgreSQL data and I see some schema
> data disappeared(only data). log files says 'db system was not properly
> shut down' so 'automatic recover in progress' when PostgreSQL server
> started after Windows Server get restarted.
> I think this 'not properly shut down' causes windows server cold
> booting.(I need to turn on the server quickly for some reason and my
> server spends a lot of time to restart.)

To me it looks like the OS is crashing and bringing the Postgres server
down with it. There is a chance it is the other way around. To figure
this out I would suggest looking at what is the below just before/at
time of crash/after restart:

1) The Windows system logs

2) The Postgres log

>
> 2019년 4월 2일 (화) 오후 1:21, Adrian Klaver <adrian.klaver@xxxxxxxxxxx
> <mailto:adrian.klaver@xxxxxxxxxxx>>님이 작성:
>
>     On 4/1/19 6:21 PM, 김준형 wrote:
>      > Hi Community, I have problem so I wanna help from PostgreSQL
>     community.
>      > My problem is using PostgreSQL with nextcloud(cloud system) and
>     It can
>      > make no more connection to server. I checked log files and knew
>     reason.
>      > PostgreSQL prevented to disconnecting connection but still tried to
>      > connect PostgreSQL server. This problem blocks to connect server and
>      > can't stop PostgreSQL service. What I can do is just restart the
>     server
>      > and recover PostgreSQL data(I don't know why some data disappear.).
>      > Can I get some help about this problem?
>
>     Not sure I entirely understand the above, so to help can you answer the
>     following:
>
>     1) The Postgres server is running on nextcloud, correct?
>
>     2) The client you are using to connect to the server is on nextcloud
>     also or somewhere else?
>
>     3) The log files do not show a problem, is this correct?
>
>     4) Do you see an error message on the client end when you try to
>     connect?
>
>     5) Have you looked at your pg_hba.conf to see if allows connections
>     from
>     your client?
>
>     6) Not sure what you mean when you say you cannot stop the service, but
>     that you can restart it?
>
>     7) How do you know that data has disappeared?
>
>      >
>      > My OS and PostgreSQL version is
>      > PostgreSQL 10.5
>      > Windows Server 2012 R2
>      >
>
>
>     --
>     Adrian Klaver
>     adrian.klaver@xxxxxxxxxxx <mailto:adrian.klaver@xxxxxxxxxxx>
>


--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx