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_fail...@yahoo.com> 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
  

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