AWS Custom Metrics

crontab

*/5 * * * * /usr/local/bin/putMetrics.sh

putMetrics.sh

#!/bin/bash
die() { status=$1; shift; echo "FATAL: $*"; exit $status; }

EC2_INSTANCE_ID="`wget -q -O - http://instance-data/latest/meta-data/instance-id || die \"wget instance-id has failed: $?\"`"
test -n "$EC2_INSTANCE_ID" || die 'cannot obtain instance-id'
EC2_AVAIL_ZONE="`wget -q -O - http://instance-data/latest/meta-data/placement/availability-zone || die \"wget availability-zone has failed: $?\"`"
test -n "$EC2_AVAIL_ZONE" || die 'cannot obtain availability-zone'
EC2_REGION="`echo \"$EC2_AVAIL_ZONE\" | sed -e 's:\([0-9][0-9]*\)[a-z]*\$:\\1:'`"

DATE="`date +%FT%T.000Z`"

MEMFREE="`free -m | grep Mem | awk '{print $4}'`"
MEMUSED="`free -m | grep Mem | awk '{print $3}'`"
MEMUTIL="`free -m | grep Mem | awk '{print $3/$2 * 100.0}'`"

aws --region $EC2_REGION cloudwatch put-metric-data --metric-name MemoryFree --namespace AWS/EC2 --unit Megabytes --value $MEMFREE --timestamp $DATE --dimensions InstanceId=$EC2_INSTANCE_ID
aws --region $EC2_REGION cloudwatch put-metric-data --metric-name MemoryUsed --namespace AWS/EC2 --unit Megabytes --value $MEMUSED --timestamp $DATE --dimensions InstanceId=$EC2_INSTANCE_ID
aws --region $EC2_REGION cloudwatch put-metric-data --metric-name MemoryUtilization --namespace AWS/EC2 --unit Percent --value $MEMUTIL --timestamp $DATE --dimensions InstanceId=$EC2_INSTANCE_ID

df -l -x tmpfs -x devtmpfs -x overlay | tail -n +2 | while read line ; do
   MOUNT="`echo \"$line\" | awk '{print $6}'`"
   DISKUSED="`echo \"$line\" | awk '{print $4 / 1024}'`"
   DISKFREE="`echo \"$line\" | awk '{print $3 / 1024}'`"
   DISKUTIL="`echo \"$line\" | awk '{print $3/$2 * 100.0}'`"
   aws --region $EC2_REGION cloudwatch put-metric-data --metric-name DiskFree --namespace AWS/EC2 --unit Megabytes --value $DISKFREE --timestamp $DATE --dimensions InstanceId=$EC2_INSTANCE_ID,MountPoint=$MOUNT
   aws --region $EC2_REGION cloudwatch put-metric-data --metric-name DiskUsed --namespace AWS/EC2 --unit Megabytes --value $DISKUSED --timestamp $DATE --dimensions InstanceId=$EC2_INSTANCE_ID,MountPoint=$MOUNT
   aws --region $EC2_REGION cloudwatch put-metric-data --metric-name DiskUtilization --namespace AWS/EC2 --unit Percent --value $DISKUTIL --timestamp $DATE --dimensions InstanceId=$EC2_INSTANCE_ID,MountPoint=$MOUNT
done