Standby Server and Barman Backup on production system

On Thu, Jul 10, 2014 at 2:24 AM, basti <mailinglist@unix-solution.de> wrote:

Hello,
I had followed this discuss
(/messages/by-id/CABRT9RAXzUa=_zT_M4Z1vyDuFkpgNCZLUnRTUO5gvK2kKkNu=A@mail.gmail.com).

I have a similar problem now:

I use one Postgres Server as Master an an other one as Standby (WAL
archives).
I do also a daily backup of the Master Server using pg_dump.
Now there is a situation where a possible restore via "cat dumpfile |
psql ...." takes to long and the server load is too high.

So my idea is to use barman for backup.
Is it possible to use wal replication and barman backupin one config file?
Is there someone how has experience with this?

The relevant barman (test)config looks like:

wal_level = archive
archive_mode = on
archive_command = 'rsync -a %p */var/lib/barman/btest/incoming/*%f'

The relevant wal replication config on production system (master) looks
like:
wal_level = hot_standby
archive_mode = on
archive_command = 'rsync -a %p -e "ssh -i*/var/lib/postgresql/*.ssh/id_rsa"postgres@standby.srv:/var/lib/postgresql/9.1/wals/master_main/%f </dev/null'

I believe that since this is just a bash command you could feasibly either:
* Chain together two rsync commands with &&
* Write a script that takes the from (%p) and to (%f) locations as
arguments to rsync them to the appropriate places.

Can I use a 2'nd rsync command here? How should I do?
What are differences between "wal_level = archive" and "wal_level =
archive" or doesn't matter here?

hot_standby has more information. From the documentation for 9.1:

In hot_standby level, the same information is logged as with archive, plus

information needed to reconstruct the status of running transactions from
the WAL. To enable read-only queries on a standby server, wal_level must be
set to hot_standby on the primary, and hot_standby must be enabled in the
standby.

So you'll get more information and bigger files being transferred if you
set your wal_level to hot_standby.

I've personally never tried rsyncing to two locations at once, so I'm not
going to comment on that. Good luck.

QP