Re: Help in vetting my steps for Postgres DB upgrade from Ver 13.X to ver 15.X

 Team /Ron/Adrian
Wann to reconfirmwe have an setup with 
new server will be with 
will be following the following suggestion
On old VM [ existing server with OS "Amazon Linux release 2 (Karoo) " present in aws "us-east-1 region" and along with postgresql ver 13.16.2  - community edn ]

 - "take offline full backup (PG_DATA folder alone)  using OS command"

On new VM [OS "Amazon Linux 2023 " in aws region=us-east-1 and intended db as "postgresql 15.10 - community edn" ] 

 - "Restore offline full backup (PG_DATA folder alone) using OS command"
- create postgres unix userid- install postgresql ver 15.10 binaries- setup respective env variable to point correctly for PG_DATA
- will follow "pg_upgrade"

my question is a) is the above said steps is correct with the given existing and proposed setupb) is their any known issues using "cross over using pg_upgrade " option between the server's having below said operating system - source = existing server with OS = Amazon Linux release 2 (Karoo) " present in aws "us-east-1 region" and along with postgresql ver 13.16.2  - community edn 
vstarget - different server OS "Amazon Linux 2023 " in aws region=us-east-1 and intended db as "postgresql 15.10 - community edn"

    On Tuesday, December 3, 2024 at 12:28:58 AM EST, Adrian Klaver <adrian.klaver@aklaver.com> wrote:  
 
 On 12/2/24 17:23, Ron Johnson wrote:
> Adrian,
> 
> OP is moving to a new VM when migrating to PG 15.  When was the 
> "cross-server" feature added to pg_upgrade?
> 

Moving to a new VM was not the issue, my mistake was thinking the OS 
version was staying the same.

Then:

On old VM:

"take offline full backup (PG_DATA folder alone)  using OS command"

On new VM:
"Restore offline full backup (PG_DATA folder alone) using OS command"

Followed by installing new Postgres version could be dealt with using 
pg_upgrade. Once I was corrected on what was actually going on then 
doing a dump/restore or logical replication became better choices.


-- 
Adrian Klaver
adrian.klaver@aklaver.com