Обсуждение: pgbackrest with PAF(corosync and pacmaker)

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pgbackrest with PAF(corosync and pacmaker)

От
Ajay Pratap
Дата:
##Arch
OS: Centos 7
PostgreSQL 10
pgbackrest 2.18
PAF: two nodes(primary and secondary ) with corosync and pacemaker

##Query
I am using pacemaker and corosync to setup two nodes High availability cluster for postgreSQL 10. In the scenario I want to setup timely backup with pgbackrest.
Using the _backup from standby_ feature I could able to take backup from my secondary  postgres. But if secondary postgres is down, it does not take backup from primary.

What I want?
I want to take backup from secondary postgres (--backup-standby), If secondary is unavailable, take backup from primary postgres.
Or if Primary postgres goes down backup should still continues from secondary (which would have been promoted to master now)

All backups are with remote repository
pgbackrest.conf for repo:
[data]
pg1-host=pgprimary
pg1-path=/var/lib/pgsql/10/data
pg2-host=pgsec
pg2-path=/var/lib/pgsql/10/data

[global]
backup-standby=y
process-max=3
repo1-path=/var/lib/pgbackrest
repo1-retention-full=2
start-fast=y

pgbackrest for primary and secondary postgres:

[data]
pg1-host=main
pg1-path=/var/lib/pgsql/10/data
pg2-host=sec
pg2-path=/var/lib/pgsql/10/data

[global]
backup-standby=n
process-max=3
repo1-path=/var/lib/pgbackrest
repo1-retention-full=2
start-fast=y


Is there any way to achieve this?
This sounds like a generic problem? Or am I doing something wrong

Regards,
ajay

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Re: pgbackrest with PAF(corosync and pacmaker)

От
David Steele
Дата:
On 10/17/19 9:48 AM, Ajay Pratap wrote:
> 
> I am using pacemaker and corosync to setup two nodes High availability 
> cluster for postgreSQL 10. In the scenario I want to setup timely backup 
> with pgbackrest.
> Using the _backup from standby_ feature I could able to take backup from 
> my secondary  postgres. But if secondary postgres is down, it does not 
> take backup from primary.

This is entirely on purpose.  Backup from standby is designed to reduce 
load on the primary so we believe it is counter-intuitive to put load 
back on the primary when the standby is down.  Running backups *at all* 
when degraded is usually a bad idea.

 > Is there any way to achieve this?

You can run more than one standby and pgBackRest will automatically 
select the first one it finds that is up.  If you must take a backup 
when degraded then you can specify --no-backup-standby on the command 
line to disable standby for that one backup.

Regards,
-- 
-David
david@pgmasters.net