[pgpool-general: 7323] Re: Setup Pgpool2 with Postgresql Streaming Replication
Tatsuo Ishii
ishii at sraoss.co.jp
Sat Oct 24 18:20:55 JST 2020
It seems the primary server was restarted again and again without any
shutdown message. Pretty strange. Maybe you manually reset PostgreSQL
or whole system repeatedly?
> 2020-10-21 01:25:12 HST [865]: [1-1] 0 00000: LOG: starting PostgreSQL 12.3 (Ubuntu 12.3-1.pgdg16.04+1) on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609, 64-bit
> 2020-10-21 01:25:12 HST [865]: [2-1] 0 00000: LOG: listening on IPv4 address "0.0.0.0", port 6432
> 2020-10-21 01:25:12 HST [865]: [3-1] 0 00000: LOG: listening on IPv6 address "::", port 6432
> 2020-10-21 01:25:12 HST [865]: [4-1] 0 00000: LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.6432"
> 2020-10-21 01:25:12 HST [865]: [5-1] 0 00000: LOG: redirecting log output to logging collector process
> 2020-10-21 01:25:12 HST [865]: [6-1] 0 00000: HINT: Future log output will appear in directory "log".
> 2020-10-21 01:27:52 HST [1505]: [1-1] 0 00000: LOG: starting PostgreSQL 12.3 (Ubuntu 12.3-1.pgdg16.04+1) on x86_6 4-pc-linux-gnu, compiled by gcc (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609, 64-bit
> 2020-10-21 01:27:52 HST [1505]: [2-1] 0 00000: LOG: listening on IPv4 address "0.0.0.0", port 6432
> 2020-10-21 01:27:52 HST [1505]: [3-1] 0 00000: LOG: listening on IPv6 address "::", port 6432
> 2020-10-21 01:27:52 HST [1505]: [4-1] 0 00000: LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.6432"
> 2020-10-21 01:27:52 HST [1505]: [5-1] 0 00000: LOG: redirecting log output to logging collector process
> 2020-10-21 01:27:52 HST [1505]: [6-1] 0 00000: HINT: Future log output will appear in directory "log".
> 2020-10-21 01:32:25 HST [2726]: [1-1] 0 00000: LOG: starting PostgreSQL 12.3 (Ubuntu 12.3-1.pgdg16.04+1) on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609, 64-bit
> 2020-10-21 01:32:25 HST [2726]: [2-1] 0 00000: LOG: listening on IPv4 address "0.0.0.0", port 6432
> 2020-10-21 01:32:25 HST [2726]: [3-1] 0 00000: LOG: listening on IPv6 address "::", port 6432
> Looking back at our emails, looks like I sent it on Wednesday, Oct. 21. Don't remember what time, maybe several hours before you responded.
>
> -----Original Message-----
> From: Tatsuo Ishii [mailto:ishii at sraoss.co.jp]
> Sent: Friday, October 23, 2020 10:58 PM
> To: Nguyen, Tu <tnguyen3 at honolulu.gov>
> Cc: pgpool-general at pgpool.net
> Subject: Re: Setup Pgpool2 with Postgresql Streaming Replication
>
> The log started at 2020-10-18 22:42:46.989 HST and ended at 2020-10-23 06:46:54 HST.
> When did you execute pcp_recovery_node exactly?
>
>> Hi Tatsuo,
>>
>> Here are the logs.
>>
>> Thanks,
>> Alan
>>
>> -----Original Message-----
>> From: Tatsuo Ishii [mailto:ishii at sraoss.co.jp]
>> Sent: Friday, October 23, 2020 10:30 PM
>> To: Nguyen, Tu <tnguyen3 at honolulu.gov>
>> Cc: pgpool-general at pgpool.net
>> Subject: Re: Setup Pgpool2 with Postgresql Streaming Replication
>>
>>> Hi all,
>>>
>>> Looks like I may have been able to run the pcp_recovery_node command, but after I entered the password, it goes to the next line and just stays there, no errors or anything. Maybe it's stuck?
>>
>> If you provide the log I requested, I can examine what's wrong.
>>
>>> 1) I need the PostgreSQL log while you are getting:
>>>>> Ran this command on the primary server: pcp_recovery_node -h
>>>>> 192.168.80.90 -p 9898 -U postgres -n 1 And received this error:
>>>>> ERROR: recovery is checking if postmaster is started
>>>>> DETAIL: postmaster on hostname:"ltpgsql12" database:"template1"
>>>>> user:"postgres" failed to start in 90 second
>>
>>>I looked on the standby server node I'm trying to recover, with the "top" command and it says CPU usage is around 35% for the pg_basebackup command. It's been almost 5 hours like this. Does anyone know how long it takes? I heard that the standby recovery takes a long time, but does it really take this long? I have around 15 databases that totals about 300-500 MB of data that Pgpool2 is supposedly trying to recover right now.
>>>
>>> Thanks,
>>> Alan
>>>
>>> -----Original Message-----
>>> From: Tatsuo Ishii [mailto:ishii at sraoss.co.jp]
>>> Sent: Thursday, October 22, 2020 1:43 AM
>>> To: Nguyen, Tu <tnguyen3 at honolulu.gov>
>>> Cc: pgpool-general at pgpool.net
>>> Subject: Re: Setup Pgpool2 with Postgresql Streaming Replication
>>>
>>>> 2020-10-19 10:06:44.941 HST [24277] LOG: starting PostgreSQL 12.3
>>>> (Ubuntu 12.3-1.pgdg16.04+1) on x86_64-pc-linux-gnu, compiled by gcc
>>>> (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609, 64-bit
>>>
>>> The document is for CentOS, while you are using Ubuntu. I am not sure the documentation is useful for you or not. Anyway...
>>>
>>> 1) I need the PostgreSQL log while you are getting:
>>>
>>>>> I'm at step 7.3.8.1 Set up PostgreSQL standby server:
>>>>> Ran this command on the primary server: pcp_recovery_node -h
>>>>> 192.168.80.90 -p 9898 -U postgres -n 1 And received this error:
>>>>> ERROR: recovery is checking if postmaster is started
>>>>> DETAIL: postmaster on hostname:"ltpgsql12" database:"template1"
>>>>> user:"postgres" failed to start in 90 second
>>>
>>> 2) Do you follow the step "7.3.4. Before Starting"? I am asking because you got this error:
>>>
>>> 2020-10-19 13:10:23.521 HST [6757] postgres at postgres DETAIL: User "postgres" has no password assigned.
>>> Connection matched pg_hba.conf line 8: "host all all 0.0.0.0/0 md5"
>>>
>>> Have you executed below in the documentation?
>>>
>>> [server1]# psql -U postgres -p 5432
>>> postgres=# SET password_encryption = 'scram-sha-256';
>>> postgres=# CREATE ROLE pgpool WITH LOGIN;
>>> postgres=# CREATE ROLE repl WITH REPLICATION LOGIN;
>>> postgres=# \password pgpool
>>> postgres=# \password repl
>>> postgres=# \password postgres
>>>
>>>
>>>
>>> From: "Nguyen, Tu" <tnguyen3 at honolulu.gov>
>>> Subject: RE: Setup Pgpool2 with Postgresql Streaming Replication
>>> Date: Thu, 22 Oct 2020 09:35:36 +0000
>>> Message-ID:
>>> <F152F79048C4864E9825A767687750E404E82E97F0 at CchExMail2.cchnl.hnl>
>>>
>>>> Hi Tatsuo,
>>>>
>>>> Yes I'm using Pgpool-II version 4.0.
>>>>
>>>> Ssh doesn't seem to be the issue, I was able to test ssh
>>>> successfully to both servers using this command from the new
>>>> documentation: ssh postgres at serverX -i ~/.ssh/id_rsa_pgpool
>>>>
>>>> I have attached the postgresql-12-main.log file.
>>>>
>>>> After we get the online recovery task fixed, are there recommended step by step instructions on how to best setup Postgresql Streaming Replication for Pgpool-II 4.0 clustering? When I execute the "show pool_nodes" command, the replication_state and replication_sync_state values are blank and data is not being replicated.
>>>>
>>>> On another topic, can the Pgpool2 Connection Pooling feature handle 3,000-4,000 simultaneous connections effectively?
>>>>
>>>> Thanks,
>>>> Alan
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: Tatsuo Ishii [mailto:ishii at sraoss.co.jp]
>>>> Sent: Wednesday, October 21, 2020 10:21 PM
>>>> To: Nguyen, Tu <tnguyen3 at honolulu.gov>
>>>> Cc: pgsql-general at postgresql.org
>>>> Subject: Re: Setup Pgpool2 with Postgresql Streaming Replication
>>>>
>>>> Hi Alan,
>>>>
>>>> This is not the best forum to discuss Pgpool-II related topics. I advice you to go to the Pgpool-II dedicated forum:
>>>>
>>>> https://www.pgpool.net/mailman/listinfo/pgpool-general
>>>>
>>>>> Hi,
>>>>>
>>>>> I'm following the steps from:
>>>>>
>>>>> https://access.crunchydata.com/documentation/pgpool/4.0.0/example-c
>>>>> l
>>>>> u
>>>>> s
>>>>> ter.html
>>>>
>>>> This documentation looks pretty old. The original and the latest documentation for Pgpool-II 4.0 is here (I assume you are using Pgpool-II 4.0):
>>>>
>>>>
>>>>
>>>>
>>>> https://www.pgpool.net/docs/40/en/html/example-cluster.html
>>>>
>>>> I strongly suggest to look into this.
>>>>
>>>>> I'm at step 7.3.8.1 Set up PostgreSQL standby server:
>>>>> Ran this command on the primary server: pcp_recovery_node -h
>>>>> 192.168.80.90 -p 9898 -U postgres -n 1 And received this error:
>>>>> ERROR: recovery is checking if postmaster is started
>>>>> DETAIL: postmaster on hostname:"ltpgsql12" database:"template1"
>>>>> user:"postgres" failed to start in 90 second
>>>>>
>>>>> How can I get this command to run successfully?
>>>>
>>>> Probably you have a problem with ssh settings. The newer and original document describes far detailed steps to set up ssh settings. Please take a look at "7.3.2. Requirements" section in the newer document.
>>>>
>>>> In the mean time to confirm that the problem is related to ssh, we need to look into the PostgreSQL log (not Pgpool-II log) on primary PostgreSQL node. Please share it (again, you'd better to post messages to the pgpool-general mailing list).
>>>>
>>>>> Also, when I ran this command: psql -p 5433 -c "show pool_nodes"
>>>>> It shows the following pgpool2 node status, but when I did a
>>>>> listing of databases on the primary and standby servers, I don't
>>>>> see the databases on the primary replicated to the standby. How
>>>>> can I setup the Postgresql Streaming Replication and check if it's working?
>>>>
>>>> Standby status is down because you failed to execute online recovery. You need to fix it.
>>>>
>>>>> node_id | hostname | port | status | lb_weight | role | select_cnt |
>>>>> load_balance_node | replication_delay | replication_state |
>>>>> replication_sync_state | last_status_change
>>>>> ---------+-----------+------+--------+-----------+---------+------------+-------------------+-------------------+-------------------+------------------------+---------------------
>>>>> 0 | ltpgsql11 | 6432 | up | 0.500000 | primary | 0 |
>>>>> true | 0 | |
>>>>> | 2020-10-21 11:56:48
>>>>> 1 | ltpgsql12 | 6432 | down | 0.500000 | standby | 0 |
>>>>> false | 0 | |
>>>>> | 2020-10-21 11:56:48
>>>>> (2 rows)
>>>>>
>>>>>
>>>>> Thanks,
>>>>> Alan
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Sent from:
>>>>> https://www.postgresql-archive.org/PostgreSQL-general-f1843780.html
>>>>>
>>>>>
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