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+<!doctype refentry PUBLIC "-//OASIS//DTD DocBook V4.5//EN" [
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<refsynopsisdiv>
<cmdsynopsis>
<command>&dhpackage;</command>
- <arg><option>bs=<replaceable>blocksize</replaceable></option></arg>
- <arg><option>timeout=<replaceable>seconds</replaceable></option></arg>
- <arg choice=plain><option><replaceable>host</replaceable></option></arg>
- <arg choice=plain><option><replaceable>port</replaceable></option></arg>
- <arg choice=plain><option><replaceable>nbd-device</replaceable></option></arg>
- <arg><option>-sdp</option></arg>
- <arg><option>-swap</option></arg>
- <arg><option>-persist</option></arg>
+ <arg choice=plain><replaceable>host</replaceable></arg>
+ <arg><replaceable>port</replaceable></arg>
+ <arg choice=plain><replaceable>nbd-device</replaceable></arg>
+ <arg>-sdp</arg>
+ <arg>-swap</arg>
+ <arg>-persist</arg>
+ <arg>-nofork</arg>
+ <arg>-block-size <replaceable>block size</replaceable></arg>
+ <arg>-timeout <replaceable>seconds</replaceable></arg>
+ <arg>-name <replaceable>name</replaceable></arg>
</cmdsynopsis>
<cmdsynopsis>
<command>&dhpackage;</command>
<arg choice=plain><option>-d <replaceable>nbd-device</replaceable></option></arg>
</cmdsynopsis>
+ <cmdsynopsis>
+ <command>&dhpackage;</command>
+ <arg choice="plain"><option>-c <replaceable>nbd-device</replaceable></option></arg>
+ </cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>DESCRIPTION</title>
server and use its exported file through a block special file with
major mode 43.</para>
+ <para>Optionally, long options can also be specified with two
+ leading dashes.</para>
</refsect1>
<refsect1>
<title>OPTIONS</title>
<variablelist>
<varlistentry>
- <term><option>bs=<replaceable>blocksize</replaceable></option></term>
+ <term><option>-block-size <replaceable>block size</replaceable></option></term>
+ <term><option>-b</option></term>
<listitem>
- <para>Use a blocksize of "blocksize". Default is 1024;
+ <para>Use a blocksize of "block size". Default is 1024;
allowed values are either 512, 1024, 2048 or 4096</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>host</option></term>
<listitem>
- <para>The hostname of the machine running
- <command>nbd-server</command>.</para>
+ <para>The hostname or IP address of the machine running
+ <command>nbd-server</command>. Since 2.9.15, the NBD
+ utilities support IPv6.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><option>-timeout
+ <replaceable>seconds</replaceable></option></term>
+ <term><option>-t</option></term>
+ <listitem>
+ <para>Set the connection timeout to "seconds". For this to
+ work, you need a kernel with support for the NBD_SET_TIMEOUT
+ ioctl; this was introduced into Linus' tree on 2007-10-11,
+ and will be part of kernel 2.6.24.</para>
</listitem>
</varlistentry>
<varlistentry>
<listitem>
<para>The TCP port on which <command>nbd-server</command> is
running at the server.</para>
+ <para>This option is required, unless the -N option is
+ specified, in which case it is not allowed.</para>
</listitem>
</varlistentry>
<varlistentry>
</listitem>
</varlistentry>
<varlistentry>
+ <term><option>-check</option></term>
+ <term><option>-c</option></term>
+ <listitem>
+ <para>Check whether the specified nbd device is
+ connected.</para>
+ <para>If the device is connected, &dhpackage; will exit
+ with an exit state of 0 and print the PID of the &dhpackage;
+ instance that connected it to stdout.
+ <para>If the device is not
+ connected or does not exist (for example because the nbd
+ module was not loaded), &dhpackage; will exit with an exit
+ state of 1 and not print anything on stdout.</para>
+ <para>If an error occurred, &dhpackage; will exit with an exit
+ state of 2, and not print anything on stdout either.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><option>-disconnect</option></term>
+ <term><option>-d</option></term>
+ <listitem>
+ <para>Disconnect the specified nbd device from the
+ server</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><option>-persist</option></term>
+ <term><option>-p</option></term>
+ <listitem>
+ <para>When this option is specified, &dhpackage; will
+ immediately try to reconnect an nbd device if the
+ connection ever drops unexpectedly due to a lost
+ server or something similar.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
<term><option>-sdp</option></term>
+ <term><option>-S</option></term>
<listitem>
<para>Connect to the server using the Socket Direct Protocol
(SDP), rather than IP. See nbd-server(1) for details.
</varlistentry>
<varlistentry>
<term><option>-swap</option></term>
+ <term><option>-s</option></term>
<listitem>
<para>Specifies that this NBD device will be used as
- swapspace. If you intend to do that, please use this
- option to prevent deadlocks. You'll need a special kernel
- patch, available at NBD's homepage:
- http://atrey.karlin.mff.cuni.cz/~pavel</para>
+ swapspace. This option attempts to prevent deadlocks by
+ performing mlockall() at an appropriate time. It does not
+ however guarantee that such deadlocks can be avoided.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><option>-nofork</option></term>
+ <term><option>-n</option></term>
+ <listitem>
+ <para>Specifies that the NBD client should not detach and
+ daemonize itself. This is mostly useful for debugging.</para>
+ <para>
+ Note that nbd-client will still fork once to trigger an
+ update to the device node's partition table. It is not
+ possible to disable this.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><option>-name</option></term>
+ <term><option>-N</option></term>
+ <listitem>
+ <para>
+ Specifies the name of the export that we want to use. Required if
+ the port is not specified, not allowed in the other case.
+ </para>
</listitem>
</varlistentry>
</variablelist>
<listitem>
<para>To connect to a server running on port 2000 at host
"server.domain.com", using the client's block special file
- "/dev/nb0":</para>
+ "/dev/nbd0":</para>
<para><command>nbd-client server.domain.com 2000
- /dev/nb0</command></para>
+ /dev/nbd0</command></para>
</listitem>
<listitem>
<para>To connect to a server running on port 2001 at host
"swapserver.domain.com", using the client's block special
- file "/dev/nb1", for swap purposes:</para>
- <para><command>nbd-client swapserver.domain.com 2001 /dev/nb1
+ file "/dev/nbd1", for swap purposes:</para>
+ <para><command>nbd-client swapserver.domain.com 2001 /dev/nbd1
-swap</command></para>
</listitem>
<listitem>
<para>To disconnect the above connection again (after making
sure the block special file is not in use anymore):</para>
- <para><command>nbd-client -d /dev/nb1</command></para>
+ <para><command>nbd-client -d /dev/nbd1</command></para>
</listitem>
</itemizedlist>
</refsect1>
</refsect1>
</refentry>
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projects / nbd.git / blobdiff