It’s not a conflict, it updates the default postgresql 9.2 provided by CentOS 7 that’s still used by Webtop, zabbix and phpmyadmin for example.
Upgrading packages provided by the distro with external ones can cause problems.
SCL aims to avoid these problems by providing newer versions of software and run it in a special environment. This would allow installing rh-postgresql12 next to the postgresql 9.2 packages.
The new zammad 5 RPM requires the external postgres packages so it’s not installable without upgrading.
So at least if we go the external upgrade way we need to test impacted software and maybe need to upgrade modules that use it - that’s effort.
I feel you as I always fighted for native integration of software because of ressources/performance/security.
But even if docker generates overhead and another layer, it would solve update or package requirements issues.
If we had used docker, we could just run Zammad 5 now without issues.
We could Install from source or repackage zammad but that’s effort too. I’m going to check and test possible solutions.
From Zammad docs:
The source installation is the most difficult installation type of Zammad.