gistfile1.txt

Make this a file, executable, add this to cron:
*/5 * * * * root /path/to/script;

Requirements: sysstat package on CentOS (yum install sysstat) || or just the sar command

#!/bin/env php
<?php
$host = "http://servly.com/rrd/update";
error_reporting(E_NONE);
echo "\n";
$mon = array();
sleep(5); // so it reads properly
/* CPU Usage */
$cpu = `sar 1 | awk 'END {print \$NF}'`;
$mon[cpu][free] = $cpu;
$mon[cpu][used] = 100-$mon[cpu][free];

/* Load */
$load = `uptime | awk -F"load average: " '{print \$2}' | awk '{print \$1}' | awk -F"," '{print \$1}'`;

/* MEMORY USAGE */
$memory = `free | grep /+`;
$mon[mem][free] = `echo "$memory" | awk '{print $4}'`;
$mon[mem][used] = `echo "$memory" | awk '{print $3}'`;
$memory = `sar -r 1 | tail -n 1`;
$mon[mem][buffers] = `echo "$memory" | awk '{print $5}'`;
$mon[mem][cached] = `echo "$memory" | awk '{print $6}'`;
$memory = `free -m | grep Swap`;
$mon[mem][swapfree] = `echo "$memory" | awk '{print $4}'`;
$mon[mem][swapused] = `echo "$memory" | awk '{print $3}'`;

/* PROCESSES RUNNING */
$mon[processes] = `ps ax | grep -c ""`;

/* NETWORK STATS */
//$network = `sar -n DEV 1 -o | grep eth0 | tail -n 1`;
#cat /proc/net/dev | grep eth0 | cut -d: -f2 | awk '{ print $1":"$9}'
$network = `cat /proc/net/dev | grep eth0 | cut -d: -f2 | awk '{ print $1":"$9}'`;
$_n = explode(':', $network);
$mon[net][tx] = $_n[1];
$mon[net][rx] = $_n[0];
#$mon[net][tx] = `echo "$network" | awk '{print $9}'`;
#$mon[net][rx] = `echo "$network" | awk '{print $1}'`;

print_r($mon);

// lets send it to the host!
$post_data = array();
					   $post_data['cpufree'] = 
$mon[cpu][free];
					   $post_data['freemem'] = 
$mon[mem][free];
					   $post_data['load'] = $load;
					$post_data['mem_free'] = 
$mon[mem][free];
					$post_data['mem_used'] = 
$mon[mem][used];
					$post_data['mem_buffers'] = 
$mon[mem][buffers];
					$post_data['mem_cached'] = 
$mon[mem][cached];
					$post_data['net_tx'] = 
$mon[net][tx];
					$post_data['net_rx'] = 
$mon[net][rx];
					$post_data['procs'] = 
$mon[processes];
$post_data['swap_used'] = $mon[mem][swapused];
$post_data['disk_size'] = $mon[disk][size];
$post_data['disk_used']= $mon[disk][used];
					   $url = $host;
					   $o="";
					   foreach ($post_data as 
$k=>$v)
					   {
						   $o.= 
"$k=".utf8_encode($v)."&";
					   }
					   $post_data=substr($o,0,-1);
					  
					   $ch = curl_init();
					   curl_setopt($ch, 
CURLOPT_POST, 1);
					   curl_setopt($ch, 
CURLOPT_HEADER, 0);
					   curl_setopt($ch, CURLOPT_URL, 
$url);   
					   curl_setopt($ch, 
CURLOPT_POSTFIELDS, $post_data);
					   $result = curl_exec($ch);

?>