1. Log in to your AWS Management Console.
2. Navigate to the EC2 dashboard.
3. Click on the “Reserved Instances” link in the left-hand navigation menu.
4. In the “Reserved Instances” page, you will see a list of all your reserved instances. Look for the ones that are expiring in the next 30 days.
5. Select the reserved instances that are expiring soon and click on the “Actions” button.
6. From the drop-down menu, select “Modify Reserved Instances”.
7. In the “Modify Reserved Instances” page, you can modify the instance type, availability zone, and the number of instances you want to reserve.
8. Once you have made the necessary changes, click on the “Modify” button to save the changes.
9. After modifying the reserved instances, you will receive a confirmation message that the changes have been made.

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1. Open your terminal and ensure that you have the AWS CLI installed and configured with your AWS account credentials.
2. Run the following command to list all the Reserved Instances that are about to expire in the next 30 days:

aws ec2 describe-reserved-instances --filters "Name=state,Values=active" "Name=product-description,Values=Linux/UNIX (Amazon VPC)" "Name=scope,Values=Availability Zone" --query 'ReservedInstances[?End <= `'"$(date -u +'%Y-%m-%dT%H:%M:%S.000Z' -d '+30 days')"']'

3. Review the output and identify the Reserved Instances that you want to renew. Note down the Reserved Instance ID(s) that you want to renew.
4. Run the following command to purchase a new Reserved Instance with the same specifications and lease term as the expiring Reserved Instance:

aws ec2 purchase-reserved-instances-offering --instance-count [COUNT] --reserved-instances-offering-id [OFFERING_ID] --dry-run

5. Verify that the new Reserved Instance is active and that the old Reserved Instance has been retired by running the following command:

aws ec2 describe-reserved-instances --reserved-instances-ids [OLD_INSTANCE_ID] [NEW_INSTANCE_ID]

6. Once you have verified that the new Reserved Instance is active, you can terminate the old Reserved Instance by running the following command:

aws ec2 modify-reserved-instances --reserved-instances-id [OLD_INSTANCE_ID] --target-configurations "InstanceCount=0"

1. Import the required libraries:

import boto3
from datetime import datetime, timedelta

2. Create a connection to the AWS EC2 service:

ec2 = boto3.client('ec2')

3. Retrieve the list of Reserved Instances with lease expiration dates within the next 30 days:

now = datetime.now()
filters = [{'Name': 'state', 'Values': ['active']},
           {'Name': 'instance-state-name', 'Values': ['running', 'stopped']},
           {'Name': 'end', 'Values': [str(now + timedelta(days=30)).split()[0]]}]
reserved_instances = ec2.describe_reserved_instances(Filters=filters)

4. For each Reserved Instance, check if its lease expiration date is within the next 30 days and if so, modify its lease to extend it:

for reserved_instance in reserved_instances['ReservedInstances']:
    end_date = datetime.strptime(reserved_instance['End'], '%Y-%m-%dT%H:%M:%S.%fZ')
    if (end_date - now).days <= 30:
        ec2.modify_reserved_instances(
            ReservedInstancesIds=[reserved_instance['ReservedInstancesId']],
            ClientToken=str(datetime.now().strftime('%Y%m%d%H%M%S')),
            TargetConfigurations=[
                {
                    'AvailabilityZone': reserved_instance['AvailabilityZone'],
                    'InstanceCount': reserved_instance['InstanceCount'],
                    'InstanceType': reserved_instance['InstanceType'],
                    'Platform': reserved_instance['ProductDescription'],
                    'Scope': 'Availability Zone',
                    'Tenancy': reserved_instance['InstanceTenancy']
                }
            ]
        )

5. Run the Python script on a regular basis (e.g. daily) using a scheduler like cron to ensure that Reserved Instances are always extended before their lease expires.