AWS Classroom Series – 02/Mar/2021

Using Boto3 in lambda

• Lets try to adopt the code to work with lambda

import boto3

ec2_resource = boto3.resource('ec2')

for instance in ec2_resource.instances.all():
    for name_pair in instance.tags:
        if 'Dev' in name_pair.values():
            instance.stop()

• Refer Here for the changeset
• Now create 2 ec2 instances
• For one machine try to give tags as
  • env: Dev
  • env: QA
• Now create a lambda function
• Now deploy the function
• Create and save test event
• Now test the functionality by executing test, we will see some failures
• Reason for error is aws lambda doesnot have permissions to change ec2 state
• Now lets create a role to have full ec2 access for aws lambda, navigate to IAM
• Now change permissions for lambda function
• Now lets test the lambda function
• Now this lambda function can be triggered from various sources of events
  • cloudwatch
  • Rest API Call
• Lets make some more changes in the code so that this lambda function can start, stop or terminate instances
• Refer Here for the changeset
• Next steps how to integrate lambda from triggers and how to pass across results to destinations
• AWS has SDK’s for other languages Refer Here