116 lines
5.8 KiB
Bash
Executable File
116 lines
5.8 KiB
Bash
Executable File
#!/bin/bash -
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# Author: Colin Johnson / colin@cloudavail.com
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# Date: 2011-10-30
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# Version 0.1
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# License Type: GNU GENERAL PUBLIC LICENSE, Version 3
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#
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#rds-alarm-apply start
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#confirms that executables required for succesful script execution are available
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prerequisitecheck()
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{
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for prerequisite in basename cut grep mon-put-metric-alarm rds-describe-db-instances
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do
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#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.
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hash $prerequisite &> /dev/null
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if [[ $? == 1 ]] #has exits with exit status of 70, executable was not found
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then echo "In order to use `basename $0`, the executable \"$prerequisite\" must be installed." 1>&2 ; exit 70
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fi
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done
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}
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#calls prerequisitecheck function to ensure that all executables required for script execution are available
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prerequisitecheck
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region="us-east-1"
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#handles options processing
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while getopts :d:r:t:p:e:a opt
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do
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case $opt in
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d) dbname="$OPTARG";;
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r) region="$OPTARG";;
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t) topicname="$OPTARG";;
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e) evaluationperiod="$OPTARG";;
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p) previewmode="$OPTARG";;
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a) allrds="true";;
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*) 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;;
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esac
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done
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#sets previewmode - will echo commands rather than performing work
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case $previewmode in
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true|True) previewmode="echo"; echo "Preview Mode is set to \"True.\"" 1>&2 ;;
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""|false|False) previewmode="";;
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*) echo "You specified \"$previewmode\" for Preview Mode. If specifying a Preview Mode you must specificy either \"true\" or \"false.\"" 1>&2 ; exit 64;;
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esac
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# evaluationperiod validator - must be a number between 1 and 99
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case $evaluationperiod in
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"") evaluationperiod=1;;
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[1-99]) ;;
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*) echo "You specified \"$evaluationperiod\" for your evaluation period. If specifying an evalaution period you must specify a period between 1 and 99." 1>&2 ; exit 64;;
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esac
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# region validator
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case $region in
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us-east-1|us-west-2|us-west-1|eu-west-1|ap-southeast-1|ap-northeast-1|sa-east-1|ap-southeast-2) ;;
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*) echo "The \"$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;;
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esac
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# single RDS instance validator - runs if applying to only one instance
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if [[ $allrds != "true" ]]
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then
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if [[ $dbname == "" ]]
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then echo "You did not specify an RDS instance. You must select an RDS instance to apply alarms to." 1>&2 ; exit 64
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fi
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if [[ `rds-describe-db-instances $dbname --region $region 2> /dev/null` =~ .*DBINSTANCE.*$dbame ]]
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then echo "RDS instance $dbname has been found."
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else echo "The RDS instance \"$dbname\" does not exist. You must specify a valid RDS instance." 1>&2 ; exit 64
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fi
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fi
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# multiple RDS instance validator - runs if applying to all instances
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if [[ $allrds == "true" ]]
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then
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if [[ $dbname != "" ]]
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then
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echo "You specified both \"All\" RDS instances and \"$dbname\" to apply alarms to. You must specify either one particular RDS instance (-d <dbname>) or all RDS instances (-a)." 1>&2 ; exit 64
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else
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echo "Alarms will be applied to all RDS instances."
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fi
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fi
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rdsinstancelist=`rds-describe-db-instances $dbname --region $region --show-long | grep -i DBINSTANCE | cut -d ',' -f2`
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for rdsinstancename in $rdsinstancelist
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do
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echo "Applying Alarms to RDS instance $rdsinstancename."
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#start of apply-alarms
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rdsinstancetype=`rds-describe-db-instances $rdsinstancename --region $region --show-long | cut -d ',' -f4`
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rdstorage=`rds-describe-db-instances $rdsinstancename --region $region --show-long | cut -d ',' -f6`
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#given rds instance type, determines what 5% of freeable memory is
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case $rdsinstancetype in
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db.m1.small) lowfreeablememory=0.85E8;; #1.7 GB memory
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db.m1.large) lowfreeablememory=3.75E8;; #7.5 GB memory
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db.m1.xlarge) lowfreeablememory=7.5E8;; #15 GB memory
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db.m2.xlarge) lowfreeablememory=8.55E8;; #17.1 GB memory
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db.m2.2xlarge) lowfreeablememory=17.0E8;; #34 GB memory
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db.m2.4xlarge) lowfreeablememory=34.0E8;; #68 GB memory
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*) echo "An error has occured when attempting to set low memory threshold. Please contact the author of rds-apply-alarms." 1>&2 ; exit 64;;
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esac
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#determines the low storage alert - at less than 10% of rdsstorage
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lowstorage="${rdstorage}.0E8"
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$previewmode mon-put-metric-alarm --alarm-name $rdsinstancename-RDS-CPUUtilization-Critical --metric-name CPUUtilization --namespace AWS/RDS --statistic Average --period 300 --threshold 90 --comparison-operator GreaterThanThreshold --dimensions DBInstanceIdentifier=$rdsinstancename --evaluation-periods $evaluationperiod --unit Percent --alarm-actions $topicname --region $region
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$previewmode mon-put-metric-alarm --alarm-name $rdsinstancename-RDS-FreeableMemory-Critical --metric-name FreeableMemory --namespace AWS/RDS --statistic Average --period 300 --threshold $lowfreeablememory --comparison-operator LessThanThreshold --dimensions DBInstanceIdentifier=$rdsinstancename --evaluation-periods $evaluationperiod --unit Bytes --alarm-actions $topicname --region $region
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$previewmode mon-put-metric-alarm --alarm-name $rdsinstancename-RDS-SwapUsage-Critical --metric-name SwapUsage --namespace AWS/RDS --statistic Maximum --period 300 --threshold 1048576 --comparison-operator GreaterThanThreshold --dimensions DBInstanceIdentifier=$rdsinstancename --evaluation-periods $evaluationperiod --unit Bytes --alarm-actions $topicname --region $region
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$previewmode mon-put-metric-alarm --alarm-name $rdsinstancename-RDS-FreeStorageSpace-Critical --metric-name FreeStorageSpace --namespace AWS/RDS --statistic Minimum --period 300 --threshold $lowstorage --comparison-operator LessThanThreshold --dimensions DBInstanceIdentifier=$rdsinstancename --evaluation-periods $evaluationperiod --unit Bytes --alarm-actions $topicname --region $region
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done
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