Not sure if this is the correct place to report this, but a colleague and I discovered a problem with the systemd service file as described in the documentation. In the sample, there is a need for a line reading
"After=syslogd.target network.target"
under the [unit] tag. What we found on Redhat 7.4 was that replica servers were coming up unable to find their primary servers as DNS wasn't quite available yet, but otherwise the server was operational. In any case, we don't think this addition would break anyone's configuration, and the current documentation does not reflect this.