[pgpool-general: 7320] Re: Setup Pgpool2 with Postgresql Streaming Replication
Nguyen, Tu
tnguyen3 at honolulu.gov
Sat Oct 24 17:52:54 JST 2020
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-cl
>>> 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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