Start or stop an RDS Instance as a cron on AWS

schedule_rds.sh

#!/bin/bash

maintenance_name=start-rds
rds_instance_id=rds-instance-name
dummy_ec2_id=i-00000000000000
task=AWS-StartRdsInstance # or AWS-StopRdsInstance
service_role=arn:aws:iam::00000000:role/MyRoleName
profile=default
region=us-east-1
cron_expression='cron(4 0 ? * MON-FRI *)' # From monday to friday at 07:00 PM (UTC)

window_id=$(aws ssm create-maintenance-window --name "${maintenance_name}" \
    --schedule "${cron_expression}" \
    --duration 4 \
    --cutoff 1 \
    --allow-unassociated-targets \
    --region $region \
    --profile $profile \
    | grep WindowId | cut -f4 -d'"')

echo "Maintenance Window ID: ${window_id}"

aws ssm register-task-with-maintenance-window --window-id $window_id  \
	--targets Key=InstanceIds,Values=${dummy_ec2_id}   \
	--task-arn $task   \
	--service-role-arn $service_role   \
	--task-type AUTOMATION   \
	--task-invocation-parameters "{\"Automation\":{\"Parameters\":{\"InstanceId\":[\"${rds_instance_id}\"]}}}"   \
	--max-concurrency 2   \
	--max-errors 50   \
	--profile $profile   \
--region $region

if ! [ $? -eq 0 ]; then
    echo "Rolling back..."
    aws ssm delete-maintenance-window --window-id $window_id
    exit 1;
fi