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1@example
2@c man begin SYNOPSIS
3usage: qemu-nbd [OPTION]... @var{filename}
4@c man end
5@end example
6
7@c man begin DESCRIPTION
8
071c9394 9Export QEMU disk image using NBD protocol.
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10
11@c man end
12
13@c man begin OPTIONS
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14@table @option
15@item @var{filename}
7a5ca864 16 is a disk image filename
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17@item -p, --port=@var{port}
18 port to listen on (default @samp{1024})
19@item -o, --offset=@var{offset}
7a5ca864 20 offset into the image
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21@item -b, --bind=@var{iface}
22 interface to bind to (default @samp{0.0.0.0})
23@item -k, --socket=@var{path}
24 Use a unix socket with path @var{path}
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25@item -f, --format=@var{format}
26 Set image format as @var{format}
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27@item -r, --read-only
28 export read-only
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29@item -P, --partition=@var{num}
30 only expose partition @var{num}
2f726488 31@item -s, --snapshot
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32 use @var{filename} as an external snapshot, create a temporary
33 file with backing_file=@var{filename}, redirect the write to
34 the temporary one
35@item -l, --load-snapshot=@var{snapshot_param}
36 load an internal snapshot inside @var{filename} and export it
37 as an read-only device, @var{snapshot_param} format is
38 'snapshot.id=[ID],snapshot.name=[NAME]' or '[ID_OR_NAME]'
2f726488 39@item -n, --nocache
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40@itemx --cache=@var{cache}
41 set cache mode to be used with the file. See the documentation of
42 the emulator's @code{-drive cache=...} option for allowed values.
43@item --aio=@var{aio}
44 choose asynchronous I/O mode between @samp{threads} (the default)
45 and @samp{native} (Linux only).
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46@item --discard=@var{discard}
47 toggles whether @dfn{discard} (also known as @dfn{trim} or @dfn{unmap})
48 requests are ignored or passed to the filesystem. The default is no
49 (@samp{--discard=ignore}).
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50@item -c, --connect=@var{dev}
51 connect @var{filename} to NBD device @var{dev}
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52@item -d, --disconnect
53 disconnect the specified device
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54@item -e, --shared=@var{num}
55 device can be shared by @var{num} clients (default @samp{1})
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56@item -f, --format=@var{fmt}
57 force block driver for format @var{fmt} instead of auto-detecting
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58@item -t, --persistent
59 don't exit on the last connection
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60@item -v, --verbose
61 display extra debugging information
62@item -h, --help
63 display this help and exit
64@item -V, --version
65 output version information and exit
66@end table
67
68@c man end
69
70@ignore
71
72@setfilename qemu-nbd
73@settitle QEMU Disk Network Block Device Server
74
75@c man begin AUTHOR
76Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.
77This is free software; see the source for copying conditions. There is NO
78warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
79@c man end
80
81@c man begin SEEALSO
82qemu-img(1)
83@c man end
84
85@end ignore