[pgpool-general: 7326] Re: Setup Pgpool2 with Postgresql Streaming Replication
Tatsuo Ishii
ishii at sraoss.co.jp
Sat Oct 24 18:53:10 JST 2020
> but now I'm getting the new issue where it just hangs and does nothing.
You mean pcp_recovery_command hangs?
> I suspect it's some settings in one of the configuration files (pgpool.conf, postgresql.conf, pg_hba.conf, pool_hba.conf, recovery_1st_stage, pgpool_remote_start, etc.) or system settings (authentication, etc.) that I applied when following the instructions in the documentation. Probably need to correct something.
Can you share those files (including recovery.conf) so that I can examine them?
> Yeah, I was probably restarting both pgpool and postgresql service repeatedly. Looks like after I used the scripts from your new link, it went away, but now I'm getting the new issue where it just hangs and does nothing. I suspect it's some settings in one of the configuration files (pgpool.conf, postgresql.conf, pg_hba.conf, pool_hba.conf, recovery_1st_stage, pgpool_remote_start, etc.) or system settings (authentication, etc.) that I applied when following the instructions in the documentation. Probably need to correct something.
>
> -----Original Message-----
> From: Tatsuo Ishii [mailto:ishii at sraoss.co.jp]
> Sent: Friday, October 23, 2020 11:21 PM
> To: Nguyen, Tu <tnguyen3 at honolulu.gov>
> Cc: ishii at sraoss.co.jp; pgpool-general at pgpool.net
> Subject: Re: Setup Pgpool2 with Postgresql Streaming Replication
>
> 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.htm
>>>>>> l
>>>>>>
>>>>>>
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