nbdkit [-4|--ipv4-only] [-6|--ipv6-only]
       [-D|--debug PLUGIN|FILTER|nbdkit.FLAG=N]
       [--exit-with-parent] [-e|--exportname EXPORTNAME]
       [--filter=FILTER ...] [-f|--foreground]
       [-g|--group GROUP] [-i|--ipaddr IPADDR] [--keepalive]
       [--log=default|stderr|syslog|null|/path]
       [--mask-handshake=MASK] [--name=NAME]
       [-n|--newstyle] [--no-mc|--no-meta-contexts]
       [--no-sr|--no-structured-replies] [-o|--oldstyle]
       [-P|--pidfile PIDFILE] [-p|--port PORT] [--print-uri]
       [-r|--readonly] [--run 'COMMAND ARGS ...']
       [--selinux-label=LABEL] [-s|--single]
       [--swap] [-t|--threads THREADS]
       [--timeout=TIMEOUT] [--tls=off|on|require]
       [--tls-certificates=/path/to/certificates]
       [--tls-priority=PRIORITY]
       [--tls-psk=/path/to/pskfile] [--tls-verify-peer]
       [-U|--unix SOCKET|-] [-u|--user USER]
       [-v|--verbose] [--vsock]
       PLUGIN
       [[KEY=]VALUE [KEY=VALUE [...]]] | @PATH

nbdkit --dump-config

nbdkit PLUGIN --dump-plugin

nbdkit --help

nbdkit [-V|--version]

nbdkit [--short-options|--long-options]

Network Block Device (NBD) is a network protocol for accessing block
devices over the network.  Block devices are hard disks and things that
behave like hard disks such as disk images and virtual machines.

nbdkit is both a toolkit for creating NBD servers from “unconventional”
sources, and the name of an NBD server.  nbdkit ships with many plugins
for performing common tasks like serving local files.

Please read the nbdkit(1) manual page for full usage.