nbdkit-streaming-plugin - Online in the Cloud

PROGRAM:

NAME

nbdkit-streaming-plugin - nbdkit streaming plugin

SYNOPSIS

nbdkit streaming pipe=FILENAME [size=SIZE]

DESCRIPTION

"nbdkit-streaming-plugin" is a plugin for nbdkit(1) that can turn certain kinds of input
into a stream.

If the NBD client opens the NBD port, and writes from the start to the end of the disk
without seeking backwards, then this plugin will turn the resulting disk image into a
stream of data which is written to the named "pipe" parameter.

Typical usage is with qemu tools. For example:

qemu-img convert input -O raw output

does not work if "output" is a pipe. However this does:

nbdkit -U /tmp/nbd.sock streaming pipe=output --run '
qemu-img convert -n input -O raw $nbd
'

PARAMETERS

pipe=FILENAME
Write to the named pipe or socket. If the pipe or socket does not exist, then it is
created (as a named FIFO), otherwise the existing pipe or socket is opened and used.

This parameter is required.

size=SIZE
Specify the virtual size of the stream.

This parameter is optional. If not specified, then the virtual disk appears to the
client to be very large (effectively infinite). Whether you need to specify this
parameter depends on the client. Some clients don't check the size and just
write/stream, others do checks or calculations based on the apparent size.

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