RE: Running rsync backups in pg15

Hi,

First of all, have you ever thought what happens if your database crashed
while you are updating your single backup?! It is really a dangerous
scenario there!

But any way, I suppose you are using psql to do your pg_start_backup(),
pg_stop_backup().

What about this one (I didn’t change function names):

Select pg_start_backup();

\! your_rsync_script…

Select pg_stop_bacup();

This could be more sophisticated if you want…

Regards

Michel SALAIS

De : Murthy Nunna <mnunna(at)fnal(dot)gov>
Envoyé : jeudi 7 novembre 2024 17:35
À : pgsql-admin(at)postgresql(dot)org
Objet : Running rsync backups in pg15

Hi,

In PG14 and earlier, there is no requirement to keep database connection
while rsync is in progress. However, there is a change in PG15+ that
requires rsync to be while we have the same database session open that
executes SELECT pg_backup_start('label'). This change requires a rewrite of
existing scripts we have.

Currently (pg14):

In bash script (run from cron)

1. psql Select pg_start_backup
2. rsync
3. psql Select pg_stop_backup

In pg15 and later:

In bash script (run from cron)

psql

Select pg_start_backup

! run-rsync-script

Select pg_stop_backup

It can be done, but it makes it ugly to check errors and so forth that occur
in the rsync script.

Anybody found an elegant way of doing this?

Thank you in advance for your ideas.