Re: postgres standby won't start

On 10/07/2015 10:02 AM, Ramalingam, Sankarakumar wrote:
> Hi Adrian,
> Thanks for your prompt response. I used pg_basebackup to backup my source server. I am starting this exercise on our QA side so I can do a dry run before hitting production. Would I be able to restore that backup on my target standby? If yes, would you guide me to the steps. Thanks a lot for your invaluable suggestions overall to this forum.

The steps can be found here:

http://www.postgresql.org/docs/9.4/interactive/app-pgbasebackup.html

Look at the examples at the bottom and substitute the data directory for
the standby in the -D portion. Important:

-D directory
--pgdata=directory

Directory to write the output to. pg_basebackup will create the
directory and any parent directories if necessary. The directory may
already exist, but it is an error if the directory already exists and is
not empty.

To be on safe side you could move the current files in the standby
directory to another location before pointing pg_basebackup at it.

>
>
>
> Thanks
> Kumar Ramalingam
> X6015288
>
>
> -----Original Message-----
> From: Adrian Klaver [mailto:adrian(dot)klaver(at)aklaver(dot)com]
> Sent: Monday, October 05, 2015 7:35 PM
> To: Ramalingam, Sankarakumar; pgsql-general(at)postgresql(dot)org
> Subject: Re: [GENERAL] postgres standby won't start
>
> On 10/05/2015 12:35 PM, Ramalingam, Sankarakumar wrote:
>> Thanks Adrian.
>>
>> My primary is doing fine. Only the standby. I am noticing it after a while..my Bad!!
>> Primary setting
>> #---------------------------------------------------------------------
>> ---------
>> # REPLICATION
>> #---------------------------------------------------------------------
>> ---------
>>
>> max_wal_senders = 5
>> wal_sender_delay = 1s
>> wal_keep_segments = 512
>> vacuum_defer_cleanup_age = 20
>> hot_standby = on
>>
>> Since I am unable to bring standby up, would the pg_basebackup help me out here for a complete sync? Thanks again.
>
> The problem is that the WAL files got recycled on the primary and are no longer available there, which is why the standby is failing. If you where archiving the WAL files somewhere, you could fetch the missing WAL files from there. If that is not the case then you will need to rebuild the standby to the current state(more or less) of the primary. The simplest way is to use pg_backup, but that means starting with either no data directory or an empty one on the standby. The docs page steps you through the procedure.
>
>>
>>
>>
>> Thanks
>> Kumar Ramalingam
>> X6015288
>>
>>
>
>
>
> --
> Adrian Klaver
> adrian(dot)klaver(at)aklaver(dot)com
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>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com