Hello there !
I installed InfluxDB freshly, I got a LetEncrypt certificate, I tried to set it according to the doc, and I could not start InfluxDB without really more details.
InfluxDB 1.7.4 on Debian 9.8.
> Feb 21 09:38:45 mon systemd[1]: influxdb.service: Start request repeated too quickly.
> Feb 21 09:38:45 mon systemd[1]: Failed to start InfluxDB is an open-source, distributed, time series database.
> Feb 21 09:38:45 mon systemd[1]: influxdb.service: Unit entered failed state.
> Feb 21 09:38:45 mon systemd[1]: influxdb.service: Failed with result 'exit-code'.