UPSD.CONF(5)

upsd usually allows a driver to stop responding for up to 15 seconds before declaring the data "stale". If your driver takes a very long time to process updates but is otherwise operational, you can use MAXAGE to make upsd wait longer.

When instant commands and variables setting status tracking is enabled, status execution information are kept during this amount of time, and then cleaned up. This defaults to 3600 (1 hour).

Normally upsd requires that at least one device section is defined in ups.conf when the daemon starts, to serve its data. For automatically managed services it may be preferred to have upsd always running, and reload the configuration when power devices become defined.

Tell upsd to look for the driver state sockets in path rather than the default that was compiled into the program.

Bind a listening port to the interface specified by its Internet address or name. This may be useful on hosts with multiple interfaces. You should not rely exclusively on this for security, as it can be subverted on many systems.

LISTEN 127.0.0.1
LISTEN 192.168.50.1
LISTEN myhostname.mydomain
LISTEN ::1
LISTEN 2001:0db8:1234:08d3:1319:8a2e:0370:7344

This defaults to maximum number allowed on your system. Each UPS, each LISTEN address and each client count as one connection. If the server runs out of connections, it will no longer accept new incoming client connections. Only set this if you know exactly what you’re doing.

When compiled with SSL support with OpenSSL backend, you can enter the certificate file here. The certificates must be in PEM format and must be sorted starting with the subject’s certificate (server certificate), followed by intermediate CA certificates (if applicable_ and the highest level (root) CA. It should end with the server key. See docs/security.txt or the Security chapter of NUT user manual for more information on the SSL support in NUT.

When compiled with SSL support with NSS backend, you can enter the certificate path here. Certificates are stored in a dedicated database (data split in 3 files). Specify the path of the database directory.

When compiled with SSL support with NSS backend, you can specify the certificate name to retrieve from database to authenticate itself and the password required to access certificate related private key.

When compiled with SSL support with NSS backend and client certificate validation (disabled by default, see docs/security.txt), you can specify if upsd requests or requires client’s' certificates. Possible values are :

Tell upsd to disable older/weak SSL/TLS protocols and ciphers. With relatively recent versions of OpenSSL or NSS it will be restricted to TLSv1.2 or better. Unless you have really ancient clients, you probably want to enable this. Currently disabled by default to ensure compatibility with existing setups.

Optionally specify a minimum debug level for upsd data daemon, e.g. for troubleshooting a deployment, without impacting foreground or background running mode directly. Command-line option -D can only increase this verbosity level.