ForeverYoung's blog ยป php
/atom/php/?lang=en
2007-10-22T07:20:00Z
Anton Novosyolov
Linux, programming, etc.
blohg
Scheduled ping for monitoring network health
/post/ping-monitoring/?lang=en
2007-10-22T07:20:00Z
2007-10-22T07:20:00Z
Anton Novosyolov
anton.novosyolov@gmail.com
<!-- tags: gentoo,monitoring,php,bash -->
<!-- date: 1193037600 -->
<p>Ping loss is appeared in our LAN recently. To monitor this I wrote a script that pings the gateway one time in 30 minutes and shows results on my site.</p>
<!-- tags: gentoo,monitoring,php,bash -->
<!-- date: 1193037600 -->
<p>Ping loss is appeared in our LAN recently. To monitor this I wrote a script that pings the gateway one time in 30 minutes and shows results on my site.</p>
<!-- read_more -->
<p>Ping script:</p>
<pre class="brush: bash">
#!/bin/bash
fn=`date +%F.%H:%M:%S`
dir=/var/www/localhost/htdocs/ping-stat
ping -i 0.3 -c 500 10.13.0.17 > $dir/$fn.txt
tail -n 3 < $dir/$fn.txt > $dir/$fn.stat.txt
</pre>
<p><em>crontab</em>:</p>
<pre class="brush: plain">
0,30 * * * * root /path/to/script
</pre>
<p>Script to show results on my site: <em>/var/www/localhost/cgi-bin</em>:</p>
<pre class="brush: bash">
#!/bin/sh
echo "Content-type: text/html; charset=cp1251"
echo
echo "<html><body>"
echo "<a href='http://$HTTP_HOST/ping-stat-graph/packetlost.php'>Chart</a><br>"
echo "<a href='http://$HTTP_HOST/ping-stat-graph/packetlost.php?t'>Timings chart</a><br>"
echo "<form action='http://$HTTP_HOST/ping-stat-graph/packetlost.php'>"
echo "Show last records, how much <input name='s'><input type='submit' value='Show'><br>"
echo "Show last records, timings, how much <input name='s'><input type='submit' value='Show'><input type='hidden' name='t'></form>"
echo "<table>"
for i in $( find /var/www/localhost/htdocs/ping-stat/ -type f -not -name "*.stat.txt" -printf "%f\n" | sort )
do
base=`expr match "$i" '\([^.]*\.[^.]*\)'`
echo "<tr><td><a href='/ping-stat/$i'>$base</a><br></td>"
if [ -e "/var/www/localhost/htdocs/ping-stat/$base.stat.txt" ]
then
echo "<td><a href='/ping-stat/$base.stat.txt'>Briefly</a></td><tr>"
else
echo "<td>Briefly</td><tr>"
fi
done
echo "</table>"
echo "</body></html>"
</pre>
<p>Script to show chart <em>/var/www/localhost/htdocs/ping-stat-graph/packetlost.php</em> (my friend mvf is author of the script):</p>
<pre class="brush: php">
<?php
$dir = "/var/www/localhost/htdocs/ping-stat/";
$filename_date_format = "%Y-%m-%d.%H:%M:%s.";
$filename_format = "^[[:punct:][:digit:]]{14,30}\.stat\.txt$";
$file_content_format ="([[:digit:]]+) packets transmitted, ([[:digit:]]+) received, [[:digit:]]+% packet loss, time [[:digit:]]+ms[[:space:]]*rtt min/avg/max/mdev = ([[:digit:]\.]+)/([[:digit:]\.]+)/([[:digit:]\.]+)/([[:digit:]\.]+) ms";
/////////////////////////////////////////////////////////////////
// Returns a date from a string based on a given format
function parseDate( $date, $format )
{
// Builds up date pattern from the given $format, keeping delimiters in place.
if( !preg_match_all( "/%([YmdHMs])([^%])*/", $format, $formatTokens, PREG_SET_ORDER ) ) {
return false;
}
$datePattern = "";
foreach( $formatTokens as $formatToken )
{
$delimiter = preg_quote( $formatToken[2], "/" );
if($formatToken[1] == 'Y') {
$datePattern .= '(.{1,4})'.$delimiter;
} else {
$datePattern .= '(.{1,2})'.$delimiter;
}
}
if( !preg_match( "/".$datePattern."/", $date, $dateTokens) ) return false;
$dateSegments = array();
for($i = 0; $i < count($formatTokens); $i++) {
$dateSegments[$formatTokens[$i][1]] = $dateTokens[$i+1];
}
return mktime ( $dateSegments["H"], $dateSegments["M"], $dateSegments["s"], $dateSegments["m"], $dateSegments["d"], $dateSegments["Y"]);
}
/////////////////////////////////////////////////////////////////
// for usort
function cmp_by_date($a, $b)
{
if ($a['time'] == $b['time']) { return 0; }
return ($a['time'] < $b['time']) ? -1 : 1;
}
////////////////////////////////////////////////////////////////
//// begin
////////////////////////////////////////////////////////////////
$filenames = scandir($dir);
$data = array();
foreach ($filenames as $filename)
{
$full_name = $dir.$filename;
if (!is_dir($full_name) && $filename != "." && $filename != ".." && ereg($filename_format, $filename))
{
$ftime = parseDate($filename, $filename_date_format);
ereg($file_content_format,file_get_contents($full_name),$res);
$data_piece['time'] = $ftime;
$data_piece['time_text'] = date("H:i",$ftime);
if ($res[1]!=0) $data_piece['lost'] = (1 - $res[2]/$res[1])*100; else $data_piece['lost'] = 100;
$data_piece['transmitted'] = $res[1]+0;
$data_piece['received'] = $res[2]+0;
$data_piece['min'] = $res[3]+0.0;
$data_piece['avg'] = $res[4]+0.0;
$data_piece['max'] = $res[5]+0.0;
$data_piece['mdev'] = $res[6]+0.0;
$data[] = $data_piece;
} // if (!is_dir ...
} // foreach ($filenames
usort($data, "cmp_by_date");
if (isset($_GET['s'])) // if "how much" is present
{
$size = count($data);
$disired_size = 0 + $_GET['s'];
$croppoint = $size - $disired_size;
if ($croppoint < 0) $croppoint = 0;
$data = array_slice($data, $croppoint);
}
require('chart.php');
$time_min = array();
$time_max = array();
$time_avg = array();
$x_axis = array();
$lost = array();
foreach ($data as $data_piece)
{
$time_min[] = $data_piece['min'];
$time_max[] = $data_piece['max'];
$time_avg[] = $data_piece['avg'];
$x_axis[] = $data_piece['time_text'];
$lost[] = $data_piece['lost'];
}
//plot (array $c1, array $c2 = false, color $color = "black",
// string $style = "lines", color $gradient_color = "black",
// int $parameter = 0)
if (isset($_GET['t']))
{
$chart = new chart(2000, 500);
$chart->set_title("Ping timing (10.13.0.17 from 10.13.200.111)");
$chart->set_x_ticks ($x_axis,"text");
$chart->set_labels ("time", "ping, ms");
$chart->set_margins ($left = 50, $right = 10, $top = 20, $bottom = 43);
$chart->plot($time_max, false, "black");
$chart->add_legend("Max");
$chart->plot($time_avg, false, "red", "gradient");
$chart->add_legend("Avg", "red");
$chart->plot($time_min, false, "blue", "gradient");
$chart->add_legend("Min", "blue");
$chart->stroke();
} else
{
$chart = new chart(2000, 500);
$chart->set_title("Packet lost (10.13.0.17 from 10.13.200.111)");
$chart->set_x_ticks ($x_axis,"text");
$chart->set_labels ("time", "lost, %");
$chart->set_margins ($left = 50, $right = 10, $top = 20, $bottom = 43);
$chart->plot($lost, false, "black");
$chart->stroke();
}
?>
</pre>
<p>Library <a class="reference external" href="http://quimby.gnus.org/circus/chart/chart-manual.php">chart</a> is used for result displaying.</p>
<p>Result you can see <a class="reference external" href="http://fyfd.homeip.net/cgi-bin/ping-stat"><span class="strikeout">here</span></a> (unneeded now).</p>
<script type="text/javascript" src="http://alexgorbatchev.com/pub/sh/current/scripts/shCore.js"></script>
<script type="text/javascript" src="http://alexgorbatchev.com/pub/sh/current/scripts/shBrushBash.js"></script>
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<script type="text/javascript" src="http://alexgorbatchev.com/pub/sh/current/scripts/shBrushPhp.js"></script>
<link type="text/css" rel="stylesheet" href="http://alexgorbatchev.com/pub/sh/current/styles/shCoreDefault.css"/>
<script type="text/javascript">SyntaxHighlighter.defaults.toolbar=false; SyntaxHighlighter.all();</script>