Php wrapper script that can be used for nagios checks with an AWS ec2 instance

aws_check_nrpe.php

#!/usr/bin/php

<?php

# see https://gist.github.com/BobBurns/bc16d6e45fc01e61138f026c18187b00
# for a more efficient script using the aws php sdk

# wrapper script that can be used for nagios checks with aws ec2 instance
#
# Must have Instance Id $dim_value
# Requires aws cli configured with Access Keys
#

# build command string

# aws cloudwatch get-metric-statistics --metric-name CPUUtilization --start-time 2014-04-08T23:18:00 --end-time 2014-04-09T23:18:00 --period 3600 --namespace AWS/EC2 --statistics Maximum --dimensions Name=InstanceId,Value=i-abcdef

date_default_timezone_set ("UTC");
$end_time = date('c');
$date = date_create(date('c'));
date_sub($date, date_interval_create_from_date_string('15 minute'));
$start_time = date_format($date, 'c');

$metric_name = "CPUUtilization";
$time = date("c");
$period = "60";
$statistics = "Average";
$dim_name = "InstanceId";
$dim_value = "i-abcdefg";
$exec_path = "/usr/local/bin/aws";

$aws_command = $exec_path . " cloudwatch get-metric-statistics --metric-name " . $metric_name . " --start-time " . $start_time . " --end-time " . $end_time . " --period " . $period . " --namespace AWS/EC2 --statistics " . $statistics . " --dimensions Name=" . $dim_name . ",Value=" . $dim_value;

###########################################################################################

# get comand line arguements

$options = getopt("w:c:");
if (!$options['w'] || !$options['c'])
{ 
  echo "Usage: $argv[0] -w<warning range> -c<critical range>\n";
  exit (-1);
}


$warnings = explode(':', $options['w']);
if (count($warnings) == 2)
{
  $warn_low = $warnings[0];
  $warn_high = $warnings[1];
} else
{
  $warn_low = 0;
  $warn_high = $warnings[0];
}
 

$criticals = explode(':', $options['c']);
if (count($criticals) == 2)
{
  $crit_low = $criticals[0];
  $crit_high = $criticals[1];
} else
{
  $crit_low = 0;
  $crit_high = $criticals[0];
}
 
########################################################################################

#call aws cloudwatch


$json_result = shell_exec($aws_command);
$result = json_decode($json_result, true);

# get cpu average

$result_count = count($result['Datapoints']) - 1;
if ($result_count < 0) { $result_count = 0; }
$cpu_avg = $result['Datapoints'][$result_count]['Average'];

# compare cpu average with argv
# and exit

# TODO write timer event to return UNKNOWN if timeout > 3 sec


if ($cpu_avg > $crit_high || $cpu_avg < $crit_low)
{
  echo "*CRITICAL* - Cpu Utilization: " . $cpu_avg . "% | CpuUtilization%=" . $cpu_avg;
  echo "\n";
  exit (2);
}
if ($cpu_avg > $warn_high || $cpu_avg < $warn_low)
{
  echo "*WARNING* - Cpu Utilization: " . $cpu_avg . "% | CpuUtilization%=" . $cpu_avg;
  echo "\n";
  exit (1);
}

echo "OK - Cpu Utilization: " . $cpu_avg . "% | CpuUtilization%=" . $cpu_avg;
echo "\n";
exit (0);

?>