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To: pgsql-admin@lists.postgresql.org
From: Rahat Agivetova <rahat@ebi.ac.uk>
Subject: Operating system upgrades on PostgreSQL nodes using streaming
 replication
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Hi All,

We are planning to upgrade the operating system from Centos 7 on Primary 
and Standby PostgreSQL nodes that use streaming replication to RHEL 8.
What is the recommended order to upgrade OS from Centos 7 to RHEL 8? 
Standby first, then Primary? Can there be a small time gap between the 
upgrades or not?

Thanks,
Rahat