@example
@c man begin SYNOPSIS
-usage: qemu-nbd [OPTION]... @var{filename}
+@command{qemu-nbd} [OPTION]... @var{filename}
+
+@command{qemu-nbd} @option{-d} @var{dev}
@c man end
@end example
@c man begin DESCRIPTION
-Export QEMU disk image using NBD protocol.
+Export a QEMU disk image using the NBD protocol.
@c man end
@c man begin OPTIONS
+@var{filename} is a disk image filename, or a set of block
+driver options if @var{--image-opts} is specified.
+
+@var{dev} is an NBD device.
+
@table @option
-@item @var{filename}
- is a disk image filename
+@item --object type,id=@var{id},...props...
+Define a new instance of the @var{type} object class identified by @var{id}.
+See the @code{qemu(1)} manual page for full details of the properties
+supported. The common object types that it makes sense to define are the
+@code{secret} object, which is used to supply passwords and/or encryption
+keys, and the @code{tls-creds} object, which is used to supply TLS
+credentials for the qemu-nbd server.
@item -p, --port=@var{port}
- port to listen on (default @samp{1024})
+The TCP port to listen on (default @samp{10809})
@item -o, --offset=@var{offset}
- offset into the image
+The offset into the image
@item -b, --bind=@var{iface}
- interface to bind to (default @samp{0.0.0.0})
+The interface to bind to (default @samp{0.0.0.0})
@item -k, --socket=@var{path}
- Use a unix socket with path @var{path}
+Use a unix socket with path @var{path}
+@item --image-opts
+Treat @var{filename} as a set of image options, instead of a plain
+filename. If this flag is specified, the @var{-f} flag should
+not be used, instead the '@code{format=}' option should be set.
+@item -f, --format=@var{fmt}
+Force the use of the block driver for format @var{fmt} instead of
+auto-detecting
@item -r, --read-only
- export read-only
+Export the disk as read-only
@item -P, --partition=@var{num}
- only expose partition @var{num}
+Only expose partition @var{num}
@item -s, --snapshot
- use snapshot file
+Use @var{filename} as an external snapshot, create a temporary
+file with backing_file=@var{filename}, redirect the write to
+the temporary one
+@item -l, --load-snapshot=@var{snapshot_param}
+Load an internal snapshot inside @var{filename} and export it
+as an read-only device, @var{snapshot_param} format is
+'snapshot.id=[ID],snapshot.name=[NAME]' or '[ID_OR_NAME]'
@item -n, --nocache
- disable host cache
+@itemx --cache=@var{cache}
+The cache mode to be used with the file. See the documentation of
+the emulator's @code{-drive cache=...} option for allowed values.
+@item --aio=@var{aio}
+Set the asynchronous I/O mode between @samp{threads} (the default)
+and @samp{native} (Linux only).
+@item --discard=@var{discard}
+Control whether @dfn{discard} (also known as @dfn{trim} or @dfn{unmap})
+requests are ignored or passed to the filesystem. @var{discard} is one of
+@samp{ignore} (or @samp{off}), @samp{unmap} (or @samp{on}). The default is
+@samp{ignore}.
+@item --detect-zeroes=@var{detect-zeroes}
+Control the automatic conversion of plain zero writes by the OS to
+driver-specific optimized zero write commands. @var{detect-zeroes} is one of
+@samp{off}, @samp{on} or @samp{unmap}. @samp{unmap}
+converts a zero write to an unmap operation and can only be used if
+@var{discard} is set to @samp{unmap}. The default is @samp{off}.
@item -c, --connect=@var{dev}
- connect @var{filename} to NBD device @var{dev}
+Connect @var{filename} to NBD device @var{dev}
@item -d, --disconnect
- disconnect the specified device
+Disconnect the device @var{dev}
@item -e, --shared=@var{num}
- device can be shared by @var{num} clients (default @samp{1})
+Allow up to @var{num} clients to share the device (default @samp{1})
@item -t, --persistent
- don't exit on the last connection
+Don't exit on the last connection
+@item -x, --export-name=@var{name}
+Set the NBD volume export name. This switches the server to use
+the new style NBD protocol negotiation
+@item -D, --description=@var{description}
+Set the NBD volume export description, as a human-readable
+string. Requires the use of @option{-x}
+@item --tls-creds=ID
+Enable mandatory TLS encryption for the server by setting the ID
+of the TLS credentials object previously created with the --object
+option.
+@item --fork
+Fork off the server process and exit the parent once the server is running.
@item -v, --verbose
- display extra debugging information
+Display extra debugging information
@item -h, --help
- display this help and exit
+Display this help and exit
@item -V, --version
- output version information and exit
+Display version information and exit
+@item -T, --trace [[enable=]@var{pattern}][,events=@var{file}][,file=@var{file}]
+@findex --trace
+@include qemu-option-trace.texi
@end table
@c man end
@c man end
@c man begin SEEALSO
-qemu-img(1)
+qemu(1), qemu-img(1)
@c man end
@end ignore
projects / mirror_qemu.git / blobdiff