nbdkit-random-plugin - Man Page

plugin to serve random data

Synopsis

 nbdkit random [size=]SIZE [seed=SEED]

Description

nbdkit-random-plugin is a plugin for nbdkit(1) which serves random data.  This plugin is mainly good for testing NBD clients. This plugin creates a non-sparse random disk, for a sparse random disk see nbdkit-sparse-random-plugin(1).

The size of the virtual disk must be specified using the size parameter.  If you specify the seed parameter then you will get the same random data over multiple runs with the same seed.

The random data is generated using an insecure method.

Writes and testing copying

Writing to the disk is possible.  If you do this the plugin will check that what you are writing exactly matches what would be read at the same offset (if not, it returns EIO error).  You can use this to test copying programs by making the source and destination NBD URIs be the same:

 nbdkit -U - random size=100M --run 'nbdcopy "$uri" "$uri"'

qemu-img convert could be used in place of nbdcopy. See also nbdkit-checkwrite-filter(1).

Parameters

[size=]SIZE

Specify the virtual size of the disk image.

This parameter is required.

size= is a magic config key and may be omitted in most cases. See “Magic parameters” in nbdkit(1).

seed=SEED

Specify the random seed to get repeatable data over multiple runs.

If not specified then a random seed is chosen.

Files

$plugindir/nbdkit-random-plugin.so

The plugin.

Use nbdkit --dump-config to find the location of $plugindir.

Version

nbdkit-random-plugin first appeared in nbdkit 1.4.

See Also

nbdkit(1), nbdkit-plugin(3), nbdkit-data-plugin(1), nbdkit-full-plugin(1), nbdkit-null-plugin(1), nbdkit-pattern-plugin(1), nbdkit-sparse-random-plugin(1), nbdkit-zero-plugin(1), nbdcopy(1), qemu-img(1).

Authors

Richard W.M. Jones

License

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Referenced By

nbdkit(1), nbdkit-checkwrite-filter(1), nbdkit-data-plugin(1), nbdkit-full-plugin(1), nbdkit-null-plugin(1), nbdkit-pattern-plugin(1), nbdkit-plugin(3), nbdkit-release-notes-1.14(1), nbdkit-release-notes-1.24(1), nbdkit-release-notes-1.4(1), nbdkit-sparse-random-plugin(1), nbdkit-zero-plugin(1).

2021-01-20 nbdkit-1.25.1