Re: Turning slave into a master - PostgreSQL 9.2 - Mailing list pgsql-general

On Mon, Oct 31, 2016 at 1:46 PM, Patrick B <patrickbakerbr@gmail.com> wrote:

Hi guys,

I got a test server, let's call it test01.

The test01 has a basebackup from the master.

I want to turn test01 into a master. It doesn't need to catch up with the wal_files, because I don't need it to be up-to-date.

So what I did is:

- Replaced /var/lib/pgsql/9.2/data/ with the basebackup

- Created recovery.conf:

restore_command = 'cp /var/lib/pgsql/wal_archive/%f %p'

recovery_target_timeline = 'latest'

standby_mode = off

trigger_file = '/tmp/pg_failover_trigger' 

- touch /tmp/pg_failover_trigger

- service postgresql start

And then postgres starts recovering the wal_files. But I don't want that.. as I don't need a up-to-date

Is the wal_files required anyway?

 

​"...has a basebackup from the master" - the answer to your question depends greatly on the detail behind that sentence.

IIRC, unless you know that the data directory is consistent - because the database was offline at the time of the backup - at least some WAL will probably be required to bring the inconsistent backup data directory to a known good state (i.e., post-checkpoint).

David J.

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