#!/bin/bash

export PATH='/usr/local/bin:/usr/bin:/bin'
mem_total=`cat /proc/meminfo | grep MemTotal | awk '{print $2}'`
mem_avail=`cat /proc/meminfo | grep MemFree | awk '{print $2}'`
mem_used=`expr $mem_total - $mem_avail`
mem_pct=`awk "BEGIN {print 100*($mem_used/$mem_total)}"`
instance_id=`curl -s http://169.254.169.254/latest/meta-data/instance-id`
sleep "$((RANDOM%20))"
aws --region us-east-1 cloudwatch put-metric-data --namespace System/Linux --metric-name MemoryUtilization --unit Percent --dimensions InstanceId=$instance_id --value $mem_pct