Hi,
A slight modification to the postgresql startup script:
postgresql.log.1 is the output from systemctl status postgresql before applying the drop-in.
postgresql.log.2 is the output from systemctl status postgresql after applying the drop-in.
postgresql.service.conf is the actual drop-in from /etc/systemd/system/postgresql.service.d applied to the Fedora 30 postgresql-11.5-1.fc30 package.
The drop-in setting should replace the unit file setting in /usr/lib/systemd/system/postgresql.service.
Have a pleasant day, Mischa Baars.
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