Re: Lost replication slots after pg_upgrade.

On Thu, Feb 3, 2022, 10:54 AM Victor Sudakov <vas(at)sibptus(dot)ru> wrote:

> Nikhil Shetty wrote:
> > Hi,
> > I have a Primary and Standby running on Postgres v11.7.
> >
> > I was following the document to upgrade a PG v11.7 cluster to PG v13.4.
> > After upgrade using pg_upgrade on primary, I ran rsync to setup standby
> > PG13 but when I started the primary, the replication slots were not
> > present. How will standby start streaming in this case?
> >
> > We are using physical replication slots.
>
> You can create the replication slots manually with
> pg_create_physical_replication_slot() any time.
>
> However, unless you are very brave and know what you are doing, I'd
> recommend using pg_basebackup to setup a standby, not rsync. You can
> even use the -C and -S options of pg_basebackup to create the slots
> for you, and many other pg_basebackup's nice
>

A small demo of 11 to 13 upgrade using pg_upgrade and rsync.
It might not be all the best practices, but just following the doc on my
laptop.

>
https://gist.github.com/cabecada/4517af13245383b888833cfc69d741be

Just ensure the backed up configs are in back in and also create the
replication slot.

>