services.prometheus.exporters.postgres.environmentFile

Environment file as defined in systemd.exec(5).

Secrets may be passed to the service without adding them to the world-readable Nix store, by specifying placeholder variables as the option value in Nix and setting these variables accordingly in the environment file.

Environment variables from this file will be interpolated into the config file using envsubst with this syntax: $ENVIRONMENT ${VARIABLE}

The main use is to set the DATA_SOURCE_NAME that contains the postgres password

note that contents from this file will override dataSourceName if you have set it from nix.

  # Content of the environment file
  DATA_SOURCE_NAME=postgresql://username:password@localhost:5432/postgres?sslmode=disable

Note that this file needs to be available on the host on which this exporter is running.