How to Add Customised metric (Apache workers) in cloudwatch

Configure httpd server status enable and configure on 800 port.

Then while use aws cli configure shell script and set in cron which send data to cloudwatch after every few min.

#!/bin/bash

logger "Apache Status Started"

export AWS_CREDENTIAL_FILE=/opt/aws/credential-file-path.template
export AWS_CLOUDWATCH_HOME=/opt/aws/apitools/mon
export AWS_PATH=/opt/aws
export AWS_AUTO_SCALING_HOME=/opt/aws/apitools/as
export AWS_ELB_HOME=/opt/aws/apitools/elb
export AWS_RDS_HOME=/opt/aws/apitools/rds
export EC2_AMITOOL_HOME=/opt/aws/amitools/ec2
export EC2_HOME=/opt/aws/apitools/ec2
export JAVA_HOME=/usr/lib/jvm/jre
export PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/opt/aws/bin:/root/bin

SERVER=`wget -q -O - http://169.254.169.254/latest/meta-data/instance-id`
#echo SERVER=$SERVER
BUSYWORKERS=`wget -q -O - http://localhost:800/server-status?auto | grep BusyWorkers | awk '{ print $2 }'`
#echo BUSYWORKERS=$BUSYWORKERS
IDLEWORKERS=`wget -q -O - http://localhost:800/server-status?auto | grep IdleWorkers | awk '{ print $2 }'`
#echo IDLEWORKERS=$IDLEWORKERS

/opt/aws/bin/mon-put-data --metric-name httpd-busyworkers --namespace "EC2: HTTPD" --dimensions "InstanceId=$SERVER" --unit Count --value $BUSYWORKERS

/opt/aws/bin/mon-put-data --metric-name httpd-idleworkers --namespace "EC2: HTTPD" --dimensions "InstanceId=$SERVER" --unit Count --value $IDLEWORKERS

logger "Apache Status Ended with $SERVER $BUSYWORKERS $IDLEWORKERS"


we can setup Alaram for scale server once Busyworks reach at MinSpareServers or above more than 5 min.  as well as scale down once Busyworks less down MinSpareServers more than 5 min.

Detail and brief information we can found on

http://blog.domenech.org/2012/11/aws-cloudwatch-custom-metric-for-apache.html