Launch ec2 intances with CloudWatch alarms

You cannot directly assign a CloudWatch alarm to a launch template. However, you can create the alarm after launching the instance using the boto3 library in Python. Here's a step-by-step guide on how to launch an EC2 instance using a launch template and then create a CloudWatch alarm for each instance:

1. First, install the boto3 library if you haven't already:

pip install boto3

2. Launch an EC2 instance using a launch template:

import boto3

ec2 = boto3.client('ec2')

response = ec2.run_instances(
    LaunchTemplate={
        'LaunchTemplateName': 'your-launch-template-name',
        'Version': 'your-launch-template-version'
    },
    MinCount=1,
    MaxCount=1
)

instance_id = response['Instances'][0]['InstanceId']
print(f'Launched instance with ID: {instance_id}')

3. Create a CloudWatch alarm for the launched instance:

import boto3

cloudwatch = boto3.client('cloudwatch')

# Replace 'your-instance-idle-metric' with the appropriate metric
# and 'your-comparison-operator' with the desired operator
# (e.g., 'LessThanOrEqualToThreshold')
response = cloudwatch.put_metric_alarm(
    AlarmName=f'IdleAlarm-{instance_id}',
    ComparisonOperator='your-comparison-operator',
    EvaluationPeriods=1,
    MetricName='your-instance-idle-metric',
    Namespace='AWS/EC2',
    Period=300,
    Statistic='SampleCount',
    Threshold=1.0,
    ActionsEnabled=True,
    AlarmActions=[
        'arn:aws:automate:your-region:ec2:stop'  # Replace 'your-region' with the appropriate AWS region
    ],
    AlarmDescription=f'Alarm for stopping idle instance {instance_id}',
    Dimensions=[
        {
            'Name': 'InstanceId',
            'Value': instance_id
        },
    ],
    Unit='Seconds',
    TreatMissingData='breaching'
)

print(f'Created alarm for instance {instance_id}')

The code above launches an EC2 instance using a launch template and then creates a CloudWatch alarm for the launched instance. The alarm will stop the instance when it's inactive, based on the specified metric, comparison operator, and threshold.