NAME

       xnbd-wrapper - Manage multiple files to be exported as a block device to other computers running the
       GNU/Linux(tm) Operating System

SYNOPSIS

       xnbd-wrapper [ --imgfile IMAGE [--imgfile IMAGE ...] ] [--laddr ADDRESS] [--lport PORT] [--socket PATH]
       [--xnbd-server PATH] [--daemonize] [--logpath PATH] [--max-buf-size NUMBER] [--max-queue-size NUMBER]

DESCRIPTION

       xnbd-wrapper is a super-server for xnbd-server. Its purpose is to manage multiple exported images at
       once. A client may connect to this super-server and it will be indirected to the actual xnbd-server
       providing the requested resource.

       xnbd-wrapper comes handy if you want to export multiple files (or block devices) on a single host.
       Instead of starting multiple xnbd-server instances and remember the exported port for each, you can use
       xnbd-wrapper to looks up the requested image file name and map it automatically to the corresponding
       xnbd-server.

OPTIONS

       The following options are supported:

       --daemonize
           Go into background as soon as the xnbd-server is started up

       --imgfile IMAGE
           Export the image file IMAGE through xnbd-wrapper, with IMAGE being a block device or a file name of
           an image file.

           xnbd-wrapper will export the file name accessible through this name to clients, which may connect to
           the server by providing this name

           This option can be specified multiple times. In this case, xnbd-wrapper will export all IMAGE files
           at once. Alternatively, this argument can be omitted and images may be (un-)exported ar runtime with
           xnbd-wrapper-ctl.

       --laddr ADDRESS
           The address, where this wrapper shall listen for incoming connections. You can specify any resolvable
           hostname or IP address, being in IPv4 or IPv6 notation.

       --logpath FILE
           Log informational messages to file FILE rather than stderr/syslog.

       --syslog
           Log informational messages to syslog.

       --lport PORT
           Accept incoming connections on the given PORT. A valid port is any number between 1 and 65536. You
           may not use the same listeing port more than once per system. If this argument is not given, xNBD
           will listen on port 8520 by default.

       (--port PORT)
           Deprecated, please use --lport instead. This option might be removed in future releases.

       --socket PATH
           The xNBD wrapper can be controlled through a control socket. When given, use PATH as file name,
           default is /var/run/xnbd-wrapper.ctl.

       --xnbd-bgctl COMMAND
           Specifies the path to the xnbd-bgctl executable.  COMMAND can be a file name or a command to resolve
           to a file name using $PATH. By default, "xnbd-bgctl" resolved from $PATH is used.

       --xnbd-server COMMAND
           Specifies the path to the xnbd-server executable. The wrapper will spawn server instances on demand.
           COMMAND can be a file name or a command to resolve to a file name using $PATH. By default,
           "xnbd-server" resolved from $PATH is used.

       (--xnbd-binary PATH)
           Deprecated, please use --xnbd-server PATH instead. This option might be removed in future releases.

       --cow
           Invoke xnbd-server(8) instances using parameter --cow-target.

       --readonly
           Invoke xnbd-server(8) instances using parameter --readonly.

       --max-queue-size NUMBER
           Parameter forwarded to proxy mode xnbd-server on invocation. See xnbd-server(8) for details, please.

       --max-buf-size NUMBER
           Parameter forwarded to proxy mode xnbd-server on invocation. See xnbd-server(8) for details, please.

SEE ALSO

       xnbd-client(1), xnbd-server(8), xnbd-wrapper-ctl(8)

AUTHOR

       The NBD kernel module and the NBD tools have been written by Pavel Macheck (pavel@ucw.cz) and is now
       maintained by Paul Clements (Paul.Clements@steeleye.com).

       The xNBD userland programs have been written by Takahiro Hirofuchi (t.hirofuchi@aist.go.jp).

       This manual page was written by Arno Toell (arno@debian.org) for the Debian GNU/Linux system (but may be
       used by others). Permission is granted to copy, distribute and/or modify this document under the terms of
       the GNU General Public License, version 2, as published by the Free Software Foundation.