aws-missing-tools/as-apply-alarms/as-apply-alarms.sh

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#!/bin/bash -
# Author: Colin Johnson / colin@cloudavail.com
# Date: 2012-02-28
# Version 0.5
# License Type: GNU GENERAL PUBLIC LICENSE, Version 3
#
#as-alarm-apply start
#confirms that executables required for succesful script execution are available
prerequisitecheck()
{
for prerequisite in basename cut grep as-describe-auto-scaling-groups mon-put-metric-alarm
do
#use of "hash" chosen as it is a shell builtin and will add programs to hash table, possibly speeding execution. Use of type also considered - open to suggestions.
hash $prerequisite &> /dev/null
if [[ $? == 1 ]] #has exits with exit status of 70, executable was not found
then echo "In order to use `basename $0` the executable \"$prerequisite\" must be installed." 1>&2 ; exit 70
fi
done
}
#calls prerequisitecheck function to ensure that all executables required for script execution are available
prerequisitecheck
#sets defaults of as-apply-alarms
region="us-east-1"
#handles options processing
while getopts :g:r:t:p:e:a opt
do
case $opt in
g) asgname="$OPTARG";;
r) region="$OPTARG";;
t) topicname="$OPTARG";;
e) evaluationperiod="$OPTARG";;
p) previewmode="$OPTARG";;
a) allasg="true";;
*) echo "Error with Options Input. Cause of failure is most likely that an unsupported parameter was passed or a parameter was passed without a corresponding option." 1>&2 ; exit 64;;
esac
done
#sets previewmode - will echo commands rather than performing work
case $previewmode in
true|True) previewmode="echo"; echo "Preview Mode is set to \"True.\"" ;;
""|false|False) previewmode="";;
*) echo "You specified \"$previewmode\" for Preview Mode. If specifying a Preview Mode you must specificy either \"true\" or \"false.\"" 1>&2 ; exit 64;;
esac
# evaluationperiod validator - must be a number between 1 and 99
case $evaluationperiod in
"") evaluationperiod=1;;
[1-99]) ;;
*) echo "You specified \"$evaluationperiod\" for your evaluation period. If specifying an evaluation period you must specify a period between 1 and 99." 1>&2 ; exit 64;;
esac
# region validator
case $region in
us-east-1|us-west-2|us-west-1|eu-west-1|ap-southeast-1|ap-northeast-1|sa-east-1|ap-southeast-2) ;;
*) echo "The \"$region\" region does not exist. You must specify a valid region (example: -r us-east-1 or -r us-west-2)." 1>&2 ; exit 64;;
esac
# single asg validator - runs if applying to only one asg
if [[ $allasg != "true" ]]
then
if [[ $asgname == "" ]]
then echo "You did not specify an Auto Scaling Group. You must select an Auto Scaling Group to apply alarms to (example: as-apply-alarms.sh -g <autoscalinggroupname>) or you must select all Auto Scaling Groups (example: as-apply-alarms.sh -a)." 1>&2 ; exit 64
fi
if [[ `as-describe-auto-scaling-groups $asgname --region $region --max-records 1000 2> /dev/null` =~ .*AUTO-SCALING-GROUP.*$asgname ]]
then echo "Auto Scaling Group $asgname has been found."
else echo "The Auto Scaling Group \"$asgname\" does not exist. You must specify a valid Auto Scaling Group." 1>&2 ; exit 64
fi
fi
# multiple asg validator - runs if applying to all asgs
if [[ $allasg == "true" ]]
then
if [[ $asgname != "" ]]
then
echo "You specified both \"All\" Auto Scaling Groups and the Auto Scaling Group \"$asgname\" to apply alarms to. You must specify either one particular Auto Scaling Group (-g <autoscalinggroup>) or all Auto Scaling Groups (-a) but not both." 1>&2 ; exit 64
else
echo "Alarms will be applied to all Auto Scaling Groups."
fi
fi
asglist=`as-describe-auto-scaling-groups $asgname --show-long --region $region --max-records 1000 | grep -i "AUTO-SCALING-GROUP" | cut -d ',' -f2`
#the below works - should confirm it is an array
for asgin in $asglist
do
echo "Applying Alarms to the Auto Scaling Group named $asgin."
#to be used if any alarms are dependent on instance size
# asglaunchconfig=`as-describe-auto-scaling-groups $asgname --show-long | cut -d ',' -f3`
# asginstancetype=`as-describe-launch-configs $asglaunchconfig --show-long | cut -d ',' -f4`
$previewmode mon-put-metric-alarm --alarm-name $asgin-ASG-CPUUtilization-Critical --metric-name CPUUtilization --namespace AWS/EC2 --statistic Average --period 300 --threshold 90 --comparison-operator GreaterThanThreshold --dimensions AutoScalingGroupName=$asgin --evaluation-periods $evaluationperiod --unit Percent --alarm-actions $topicname --region $region
done