Install cron job to report memory utilization to cloudwatch

create_alarms.sh

#!/usr/bin/env bash

set -xeuo pipefail

main() {
	# TODO: add all your desired regions here
	local -a regions=(ap-south-1)

	for region in "${regions[@]}"; do
		aws --region "${region}" cloudwatch put-metric-alarm \
			--alarm-name 'UnderutilizedCPU' \
			--alarm-description 'Detects instances with under utilized CPU across long time horizons' \
			--metric-name 'CPUUtilization' \
			--namespace 'AWS/EC2' \
			--statistic Average \
			--period  300 \
			--evaluation-periods 288 \
			--threshold 15 \
			--comparison-operator LessThanThreshold

		aws --region "${region}" cloudwatch put-metric-alarm \
			--alarm-name 'UnderutilizedMemory' \
			--alarm-description 'Detects instances with under utilized memory across long time horizons' \
			--metric-name 'MemoryUtilization' \
			--namespace 'System/Linux' \
			--statistic Average \
			--period  300 \
			--evaluation-periods 288 \
			--threshold 30 \
			--comparison-operator LessThanThreshold
	done
}

main "$@"

report_memory.sh

#!/usr/bin/env bash

install_dependencies() {
	case "$(uname -a | tr '[:upper:]' '[:lower:]')" in
		*ubuntu*)
			sudo apt-get update
			sudo apt-get install -y unzip curl libwww-perl libdatetime-perl
			;;
		*)
			echo "Unknown linux distro!" 1>&2
			return 1
	esac
}

install_scripts() {
	curl http://aws-cloudwatch.s3.amazonaws.com/downloads/CloudWatchMonitoringScripts-1.2.1.zip -O
	sudo mkdir /opt
	sudo unzip CloudWatchMonitoringScripts-1.2.1.zip -d /opt
	/opt/aws-scripts-mon/mon-put-instance-data.pl --verify --mem-util --verbose
}

add_cron() {
	local job="$(mktemp)"
	echo '*/5 * * * * /opt/aws-scripts-mon/mon-put-instance-data.pl --mem-util --from-cron' > "${job}"

	case "$(uname -a | tr '[:upper:]' '[:lower:]')" in
		*ubuntu*)
			 sudo cp "${job}" /etc/cron.d/cloudwatch_metrics
			;;
		*)
			echo "Unknown linux distro!" 1>&2
			return 1
	esac
}

main() {
	install_dependencies "$@"
	install_scripts "$@"
	add_cron "$@"

	echo "Done! Check syslog for cron job logs. View metrics in Cloudwatch"
}

main "$@"