Fwd: Streaming Replication Without Downtime

Hi!

Thanks for pointing out pg_basebackup

The issue I'm facing now is about missing WAL files.

What i'm doing:
# su postgres -c 'pg_basebackup -D /var/lib/postgresql/9.1/main/ -x -h
master -U sa_rep' ; service postgresql start

The idea is to call "postgresql start" as soon as pg_basebackup ends.
But I'm getting the following error:

FATAL: could not receive data from WAL stream: FATAL: requested WAL
segment XXXXXXX has already been removed

Shoud I just increase 'wal_keep_segments' ?
If I do so, do I need do restart the master or just a reload will do it?

Thanks!
Gabriel

---------- Forwarded message ----------
From: Achilleas Mantzios <achill(at)matrix(dot)gatewaynet(dot)com>
Date: 2017-02-17 11:20 GMT-02:00
Subject: Re: [GENERAL] Streaming Replication Without Downtime
To: pgsql-general(at)postgresql(dot)org

Gabriel you are thinking this in the correct way, but its really :

pg_basebackup -D <your data dir> --write-recovery-conf --progress
--xlog-method=stream -h <your primary db server>
then you just edit recovery.conf (if needed), tweak postgersql.conf (if
needed) and start the standby .

On 17/02/2017 15:09, Gunnar "Nick" Bluth wrote:

(sorry for the toppost, mobile device)
What you're looking for is pg_basebackup with - - xlog=stream, I guess.

Regards,

Nick

Am 17. Februar 2017 14:06:36 MEZ schrieb Gabriel Ortiz Lour
<ortiz(dot)admin(at)gmail(dot)com> <ortiz(dot)admin(at)gmail(dot)com>:
>
> Hi all,
> I've been searching for a way to initialize a new Hot Standby node with
> Streaming Replication withou the need for stop or even restarting the
> master.
> Of course the master is already with the needed SR configs.
>
> I know I have to use pg_start_backup/pg_stop_backup, but i'd like some
> tips, or a link to some tutorial, with the order of the steps.
>
> I assume will be something like:
>
> - configure Slave for SR
> - pg_start_backup()
> - rsync PGDATA to slave
> - start PG on the slave
> - pg_stop_backup()
>
> Anything i'm thinking wrong?
>
> Thanks in advance,
> Gabriel
>

--
Diese Nachricht wurde von meinem Android-Mobiltelefon mit K-9 Mail
gesendet.

--
Achilleas Mantzios
IT DEV Lead
IT DEPT
Dynacom Tankers Mgmt