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-<p><a name="__index__"></a></p>
+
<!-- INDEX BEGIN -->
+<div name="index">
+<p><a name="__index__"></a></p>
<!--
<ul>
<li><a href="#name">NAME</a></li>
<li><a href="#synopsis">SYNOPSIS</a></li>
<li><a href="#description">DESCRIPTION</a></li>
- <li><a href="#example">EXAMPLE</a></li>
- <li><a href="#author">AUTHOR</a></li>
+ <li><a href="#environment_variables">ENVIRONMENT VARIABLES</a></li>
+ <li><a href="#examples">EXAMPLES</a></li>
+ <li><a href="#authors">AUTHORS</a></li>
</ul>
+
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+
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<!-- INDEX END -->
<p>
<h1><a name="synopsis">SYNOPSIS</a></h1>
<p><strong>rrdtool</strong> {<strong>update</strong> | <strong>updatev</strong>} <em>filename</em>
[<strong>--template</strong>|<strong>-t</strong> <em>ds-name</em>[<strong>:</strong><em>ds-name</em>]...]
+[<strong>--daemon</strong> <em>address</em>] [<strong>--</strong>]
<strong>N</strong>|<em>timestamp</em><strong>:</strong><em>value</em>[<strong>:</strong><em>value</em>...]
<em>at-timestamp</em><strong>@</strong><em>value</em>[<strong>:</strong><em>value</em>...]
[<em>timestamp</em><strong>:</strong><em>value</em>[<strong>:</strong><em>value</em>...] ...]</p>
is time aligned (interpolated) according to the properties of the
<strong>RRD</strong> to which the data is written.</p>
<dl>
-<dt><strong><a name="item_updatev"><strong>updatev</strong></a></strong></dt>
+<dt><strong><a name="updatev" class="item"><strong>updatev</strong></a></strong></dt>
<dd>
<p>This alternate version of <strong>update</strong> takes the same arguments and
RRA (consolidation function and PDPs per CDP), and data source (name).
Note that depending on the arguments of the current and previous call to
update, the list may have no entries or a large number of entries.</p>
+<p>Since <strong>updatev</strong> requires direct disk access, the <strong>--daemon</strong> option cannot be
+used with this command.</p>
</dd>
-<dt><strong><a name="item_filename"><em>filename</em></a></strong></dt>
+<dt><strong><a name="filename" class="item"><em>filename</em></a></strong></dt>
<dd>
<p>The name of the <strong>RRD</strong> you want to update.</p>
</dd>
-<dt><strong><a name="item__2d_2dtemplate_7c_2dt_ds_2dname_5b_3ads_2dname_5d_"><strong>--template</strong>|<strong>-t</strong> <em>ds-name</em>[<strong>:</strong><em>ds-name</em>]...</a></strong></dt>
+<dt><strong><a name="template_t_ds_name_ds_name" class="item"><strong>--template</strong>|<strong>-t</strong> <em>ds-name</em>[<strong>:</strong><em>ds-name</em>]...</a></strong></dt>
<dd>
<p>By default, the <strong>update</strong> function expects its data input in the order
using the template switch), <strong>RRDtool</strong> will ignore the value specified
for the COMPUTE <strong>DST</strong>.</p>
</dd>
-<dt><strong><a name="item_n_7ctimestamp_3avalue_5b_3avalue_2e_2e_2e_5d"><strong>N</strong>|<em>timestamp</em><strong>:</strong><em>value</em>[<strong>:</strong><em>value</em>...]</a></strong></dt>
+<dt><strong><a name="daemon_address" class="item"><strong>--daemon</strong> <em>address</em></a></strong></dt>
+
+<dd>
+<p>If given, <strong>RRDTool</strong> will try to connect to the caching daemon <a href="././rrdcached.html">the rrdcached manpage</a>
+at <em>address</em> and will fail if the connection cannot be established. If the
+connection is successfully established the values will be sent to the daemon
+instead of accessing the files directly.</p>
+<p>For a list of accepted formats, see the <strong>-l</strong> option in the <a href="././rrdcached.html">the rrdcached manpage</a> manual.</p>
+</dd>
+<dt><strong><a name="n_timestamp_value_value" class="item"><strong>N</strong>|<em>timestamp</em><strong>:</strong><em>value</em>[<strong>:</strong><em>value</em>...]</a></strong></dt>
<dd>
<p>The data used for updating the RRD was acquired at a certain
timing right to the second is especially important when you are
working with data-sources of type <strong>COUNTER</strong>, <strong>DERIVE</strong> or
<strong>ABSOLUTE</strong>.</p>
+<p>When using negative time values, options and data have to be separated
+by two dashes (<strong>--</strong>), else the time value would be parsed as an option.
+See below for an example.</p>
+<p>When using negative time values, options and data have to be separated
+by two dashes (<strong>--</strong>), else the time value would be parsed as an option.
+See below for an example.</p>
<p>The remaining elements of the argument are DS updates. The order of
this list is the same as the order the data sources were defined in
the RRA. If there is no data for a certain data-source, the letter
<p>
</p>
<hr />
-<h1><a name="example">EXAMPLE</a></h1>
+<h1><a name="environment_variables">ENVIRONMENT VARIABLES</a></h1>
+<p>The following environment variables may be used to change the behavior of
+<code>rrdtoolupdate</code>:</p>
+<dl>
+<dt><strong><a name="rrdcached_address" class="item"><strong>RRDCACHED_ADDRESS</strong></a></strong></dt>
+
+<dd>
+<p>If this environment variable is set it will have the same effect as specifying
+the <code>--daemon</code> option on the command line. If both are present, the command
+line argument takes precedence.</p>
+</dd>
+</dl>
+<p>
+</p>
+<hr />
+<h1><a name="examples">EXAMPLES</a></h1>
+<ul>
+<li>
<p><code>rrdtool update demo1.rrd N:3.44:3.15:U:23</code></p>
<p>Update the database file demo1.rrd with 3 known and one <em>*UNKNOWN*</em>
value. Use the current time as the update time.</p>
+</li>
+<li>
<p><code>rrdtool update demo2.rrd 887457267:U 887457521:22 887457903:2.7</code></p>
<p>Update the database file demo2.rrd which expects data from a single
data-source, three times. First with an <em>*UNKNOWN*</em> value then with two
regular readings. The update interval seems to be around 300 seconds.</p>
+</li>
+<li>
+<p><code>rrdtool update demo3.rrd -- -5:21 N:42</code></p>
+<p>Update the database file demo3.rrd two times, using five seconds in the
+past and the current time as the update times.</p>
+</li>
+<li>
+<p><code>rrdtool update --cache /var/lib/rrd/demo3.rrd N:42</code></p>
+<p>Update the file <code>/var/lib/rrd/demo3.rrd</code> with a single data source, using the
+current time. If the caching daemon cannot be reached, do <strong>not</strong> fall back to
+direct file access.</p>
+</li>
+<li>
+<p><code>rrdtool update --daemon unix:/tmp/rrdd.sock demo4.rrd N:23</code></p>
+<p>Use the UNIX domain socket <code>/tmp/rrdd.sock</code> to contact the caching daemon. If
+the caching daemon is not available, update the file <code>demo4.rrd</code> directly.
+<strong>WARNING:</strong> Since a relative path is specified, the following disturbing effect
+may occur: If the daemon is available, the file relative to the working
+directory <strong>of the daemon</strong> is used. If the daemon is not available, the file
+relative to the current working directory of the invoking process is used.
+<strong>This may update two different files depending on whether the daemon could be
+reached or not.</strong> Don't do relative paths, kids!</p>
+</li>
+</ul>
<p>
</p>
<hr />
-<h1><a name="author">AUTHOR</a></h1>
-<p>Tobias Oetiker <<a href="mailto:tobi@oetiker.ch">tobi@oetiker.ch</a>></p>
+<h1><a name="authors">AUTHORS</a></h1>
+<p>Tobias Oetiker <<a href="mailto:tobi@oetiker.ch">tobi@oetiker.ch</a>>,
+Florian Forster <octo at verplant.org></p>
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