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Forum discussion
This how-to can be discussed on the forums here
The rational for behind this is : You have a database / source of information that you would like to graph. In this instance, I needed to see in fairly real-time, the number of http processes as well as the size of these processes.
It could be applied to a multitude of scenarios.
Getting Started
1. Find the relevant info re; http
ps -ylC httpd | awk '{x += $8;y += 1} END {print "Apache Memory Usage (MB): "x/1024; print "Average Proccess Size (MB): "x/((y-1)*1024)}' && echo -n 'current Apache Processes : ' && ps -C httpd --no-headers | wc -l
This outputs the following information;
Apache Memory Usage (MB): 1737.91 Average Proccess Size (MB): 75.5611 current Apache Processes : 23
2. Now we must create a database to hold the information -( how you name the database, table and the columns is up to you ), I'll use the following :
- Database name : apache_stats
- Table name : performance
- Columns : number, mem_used, process_size, processors_used, period
the sql is below :
-- MySQL dump 10.13 Distrib 5.1.73, for redhat-linux-gnu (x86_64) -- -- Host: localhost Database: apache_stats -- ------------------------------------------------------ -- Server version 5.1.73 /*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */; /*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */; /*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */; /*!40101 SET NAMES utf8 */; /*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */; /*!40103 SET TIME_ZONE='+00:00' */; /*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */; /*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */; /*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */; /*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */; -- -- Table structure for table `performance` -- DROP TABLE IF EXISTS `performance`; /*!40101 SET @saved_cs_client = @@character_set_client */; /*!40101 SET character_set_client = utf8 */; CREATE TABLE `performance` ( `number` int(11) NOT NULL AUTO_INCREMENT, `mem_used` int(10) unsigned NOT NULL, `process_size` int(10) unsigned NOT NULL DEFAULT '0', `processors_used` int(10) unsigned NOT NULL, `period` datetime NOT NULL DEFAULT '0000-00-00 00:00:00', PRIMARY KEY (`number`), KEY `index` (`number`) ) ENGINE=MyISAM AUTO_INCREMENT=1 DEFAULT CHARSET=latin1; /*!40101 SET character_set_client = @saved_cs_client */; /*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */; /*!40101 SET SQL_MODE=@OLD_SQL_MODE */; /*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */; /*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */; /*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */; /*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */; /*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */; /*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */; -- Dump completed on 2015-11-26 23:35:11
Save the above into a file called : apache_memory_usage_show_to_database.sql
3. Create the database:
#mysql < apache_memory_usage_show_to_database.sql
Set the user access :
#mysql mysql> GRANT ALL PRIVILEGES ON apache_stats.* TO stats@localhost IDENTIFIED BY 'Your Password';
mysql> flush privileges;
4.Prepare the collection of the relevant parameters that you want to monitor ( in this case, http stats )
create a shell script: ( apache_memory_usage_show_to_database.sh )
#/usr/bin
while true
do
LOG=outlog.txt
OUTPUT=$(ps -ylC httpd | awk '{x += $8;y += 1} END {print "Apache Memory Usage (MB): "x/1024; print ":Average Proccess Size (MB): "x/((y-1)*1024)}' && echo -n ':Apache Processes: ' && ps -C httpd --no-headers | wc -l )
DAY=$(date +"%F"+"%T")
now=$(date +'%Y-%m-%d %H:%M:%S')
echo $OUTPUT \'$DAY\' | awk '{print "INSERT INTO performance (mem_used, process_size, processors_used,period) VALUES ( "$5", "$10", "$13", "$14" );"}' | mysql --user=username --password=password database_name
sleep 120
done
This script will insert the values for the http memory used , http process size, number of http processes running and the date+time into the database every 2 minutes
Make the script executable:
chmod 755 apache_memory_usage_show_to_database.sh
5. Create a method to run the script above - ( there are better ways to do this , but I've just used the following for now ):
nohup ./apache_memory_usage_show_to_database.sh &
6.Wait 10 minutes or so while data is written to the database, the check whats been written :
#mysql mysql> use apache_stats mysql> select * from performance limit 5;
+-------+----------+--------------+-----------------+---------------------+ | index | mem_used | process_size | processors_used | date | +-------+----------+--------------+-----------------+---------------------+ | 1 | 195 | 18 | 11 | 2015-08-18 16:26:48 | | 2 | 195 | 18 | 11 | 2015-08-18 16:27:29 | | 3 | 195 | 18 | 11 | 2015-08-18 16:28:48 | | 4 | 195 | 18 | 11 | 2015-08-18 16:29:29 | | 5 | 195 | 18 | 11 | 2015-08-18 16:30:48 | +-------+----------+--------------+-----------------+---------------------+ 5 rows in set (0.00 sec)
OK , so now we have the data been monitored, I now need a way to present / view this in an ibay ( set the permissions appropriate for your situation ) :
7.Create an iBay in server-manager :
Information bay name : stats Description : apache stats Group : admin User access via file sharing or user ftp :Write = admin, Read = Group Public access via web or anonymous ftp : Local network (password required ) Execution of dynamic content (CGI, PHP, SSI) : enabled Force secure connections : Disbaled
So now we have the place holder for the Google Chart scripts .
8. Create the needed scripts ( working example below ) and transfer them to the iBay created above :
Script to monitor http memory usage (mysqli_apache_memory_used.php ) :
<?php
// Hostname: 127.0.0.1, username: your_user, password: your_pass, db: your_db
$mysqli = new mysqli('localhost', 'username', 'password', 'db_name');
// Oh no! A connect_errno exists so the connection attempt failed!
if ($mysqli->connect_errno) {
// The connection failed. What do you want to do?
// You could contact yourself (email?), log the error, show a nice page, etc.
// You do not want to reveal sensitive information
// Let's try this:
echo "Sorry, this website is experiencing problems.";
// Something you should not do on a public site, but this example will show you
// anyways, is print out MySQL error related information -- you might log this
echo "Error: Failed to make a MySQL connection, here is why: \n";
echo "Errno: " . $mysqli->connect_errno . "\n";
echo "Error: " . $mysqli->connect_error . "\n";
// You might want to show them something nice, but we will simply exit
exit;
}
// Perform an SQL query
//$query = "SELECT number, period, process_size, processors_used FROM performance LIMIT 50";
$query ="SELECT number, period, process_size, processors_used, mem_used FROM performance WHERE period > DATE_SUB(NOW(), INTERVAL 48 HOUR)";
if (!$result = $mysqli->query($query)) {
// Oh no! The query failed.
echo "Sorry, the website is experiencing problems.";
// Again, do not do this on a public site, but we'll show you how
// to get the error information
echo "Error: Our query failed to execute and here is why: \n";
echo "Query: " . $sql . "\n";
echo "Errno: " . $mysqli->errno . "\n";
echo "Error: " . $mysqli->error . "\n";
exit;
}
// Phew, we made it. We know our MySQL connection and query
// succeeded, but do we have a result?
if ($result->num_rows === 0) {
// Oh, no rows! Sometimes that's expected and okay, sometimes
// it is not. You decide. In this case, maybe actor_id was too
// large?
echo "We could not find a match , sorry about that. Please try again.";
exit;
}
$qresult = $mysqli->query($query);
$results = array();
while($res = $qresult->fetch_assoc()) {
$results[] = $res;
}
$curvechart_data = array();
foreach($results as $result)
{
//$curvechart_data[] = array($result['period'],(int)$result['process_size'], (int)$result['processors_used'],(int)$result['mem_used']);
$curvechart_data[] = array($result['period'],(int)$result['mem_used']);
}
$curvechart_data = json_encode($curvechart_data);
//echo $curvechart_data;
// The script will automatically free the result and close the MySQL
// connection when it exits, but let's just do it anyways
//$result->free();
//$mysqli->close();
$html =<<<XYZ
<html>
<head>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">
google.load('visualization', '1.1', {packages: ['line']});
google.setOnLoadCallback(drawChart);
function drawChart() {
var data = new google.visualization.DataTable();
data.addColumn('string','Period');
//data.addColumn('number', 'No. Processors');
//data.addColumn('number', 'Process size');
data.addColumn('number', 'Memory Used');
data.addRows({$curvechart_data});
var options = {
chart: {
title: 'Apache HTTP Memory used ',
subtitle: 'in last 48 Hrs '
},colors:['red']
width: 1400,
height: 700
};
var chart = new google.charts.Line(document.getElementById('linechart_material'));
chart.draw(data, options);
}
</script>
</head>
<body>
</body>
</html>
XYZ;
echo $html;
echo date('l jS \of F Y h:i:s A');
?>
Note : wikimedia seem to have eaten some lines ???
Goto the forums and copy it from there : http://forums.contribs.org/index.php/topic,52107.0.html