Re: Looking for some help with HA / Log Log-Shipping

[Adalberto Caccia <adacaccia@xxxxxxxxx>]

Hi,

Postgresql 11 already changed the position of replication parameters, now all hosted in the main postgresql.conf file.

So on the standby node, instead of a recovery.conf file, just an empty STANDBY.SIGNAL file is needed in the $PGDATA directory to start Postgresql as a standby replica on that node.

However, as directed by the official documentation you've mentioned, section 26.2 https://www.postgresql.org/docs/12/warm-standby.html  really advises that we set-up log-shipping to better support the stand-by recovery process, and make sure we can easily recover from any transient failure.

I'm a very happy user of wal-g for this; I'm currently running 4 different Postgresql clusters some pg10 ando some pg12, but wal-g is great for any of them; I'm running them in Kubernetes, so I'm configuring wal-g directly via the Environment of the Postgresql containers, making sure wal-g is installed in my custom Postgresql image, of course. Then it is configured just like this:

archive_mode = always

archive_command = 'wal-g wal-push %p'

archive_timeout = 60

restore_command = 'wal-g wal-fetch %f %p'

Adalberto

Il giorno mer 31 mar 2021 alle ore 17:39 Laurent FAILLIE <l_faillie@xxxxxxxxx> ha scritto:

Replying to myself :)

It seems pg_basebackup did all the tricks, even restarting the slave. And it is in standby mode.

Do I have anything to do in addition ?

Thanks

Le mercredi 31 mars 2021 à 12:51:29 UTC+2, Laurent FAILLIE <l_faillie@xxxxxxxxx> a écrit :

Hello,

We are running Postgresql 12 and I'm trying to put in place streaming wal replication.

I followed officiale documentation ( https://www.postgresql.org/docs/12/warm-standby.html ) as well as this tutorial :

https://scalegrid.io/blog/managing-high-availability-in-postgresql-part-1/                   

What I did is :

* created the master db

* create replication role

* updated postgresql.conf

* finally replicate everything on the salve node using pg_basebackup (with -R option)

But now I'm lost with §26.2.4 Setting up a standby server.

In which file I have to put the

primary_conninfo 

and other options ?

Thanks

Laurent

ps: my goal is to install the PAF