The MODE determines which part of the NUT is to be started, and which configuration files must be modified. The values of MODE can be: none: NUT is not configured, or use the Integrated Power Management, or use some external system to startup NUT components. So nothing is to be started. standalone: This mode address a local only configuration, with 1 UPS protecting the local system. This implies to start the 3 NUT layers (driver, upsd and upsmon) and the matching configuration files. This mode can also address UPS redundancy. netserver: same as for the standalone configuration, but also need some more ACLs and possibly a specific LISTEN directive in upsd.conf. Since this MODE is opened to the network, a special care should be applied to security concerns. netclient: this mode only requires upsmon.

"standalone"