I am using the official RPMs for RHEL-7 and am having difficulty in using a different database directory than the default of /var/lib/pgsql/9.6/data/ or /var/lib/pgsql/10/data/ It is easy to modify the service file /usr/lib/systemd/system/postgresql-9.6.service with the line Environment=PGDATA=/var/lib/pgsql/9.6/data/ to point to the location I want, but an RPM update will replace this file and break database startup. I was hoping that there would be a line EnvironmentFile=-/etc/sysconfig/pgsql/postgresql-9.6 or EnvironmentFile=-/etc/sysconfig/pgsql/postgresql-10 to allow for customization of the environment variables, similar to the init.d startup, but I don't see one. Am I missing something, or is the configuration of the systemd unit file an oversight? Any information would be helpful. Evan.
