Start/stop EC2 instances using AWS Lambda and CloudWatch Events Scheduler

Task 1: Create one Windows/Linux instance.
Task 2: Open the IAM service and create a role to access lambda services.
Steps:
• Select AWS services
• Choose lambda use case.
• Click on permission and use two policies: AWSLambdaBasicExecutionRole (allow to use cloudwatch) and AmazonEC2Full Access. Note: You can create your policies, or you can select existing policies
• Provide a tag.
• Provide Role name and role description.
Task 3: Open Lambda services and create a new lambda function.
Steps:
• Provide function name.
• Use Python as a runtime environment.
• Go to permissions and use the created role in Task 2.
• Now basic function code window will appear, and we need to write code for starting and stopping EC2 instances.

Code:
Start instance:
import boto3
region = 'us-east-2'
instances = ['i-0f019ff0664238dcb']
ec2 = boto3.client('ec2', region_name=region)

def lambda_handler(event, context):
ec2.start_instances(InstanceIds=instances)
print('starting your instances: ' + str(instances))

Stop Instance:
import boto3
region = 'us-east-2'
instances = ['i-0f019ff0664238dcb']
ec2 = boto3.client('ec2', region_name=region)

def lambda_handler(event, context):
ec2.stop_instances(InstanceIds=instances)
print('stopped your instances: ' + str(instances))

Task 4: Save the code. Select a test event and configure the test event.
Task 5: Test the EC2 events by clicking on the startEC2 event and stopEC2 event.
Task 6: Provide the execution details of the lambda function.
Task 7: Select the event bridge and click on create a rule to trigger the created lambda function.
Steps:
• Provide a name and description for the rule.
• Define pattern as an event by providing Cron expression.
• Select targets as Lambda function, provide the name of the function, and copy the JSON text from the event window.
• Create the rule now.