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