Lambda in response to CloudWatch alarms

- [Instructor] Let's walk through the steps needed … to configure AWS Lambda to respond to CloudWatch Events. … Let's say we have a critical application server … that always needs to be in the running state. … We'll configure a CloudWatch Event rule … to monitor the state of this application server … and a Lambda function that will restart the instance … if it moves to the stopped state. … Let's start with AWS Lambda. … From the Lambda Management Console, … I'll click Create function. … I'll use the option Author from scratch … to create a new blank function. … Let's give it a name. … Next, I'll set the runtime to Python 2.7 … and choose an existing IAM role. … This IAM role will provide Lambda the required permissions … to start an EC2 instance. … If you'd like to view … the Lambda function logs in CloudWatch, … also make sure to add those permissions to the IAM role. … Next, I'll click Create function. … The function has now been created. … I'll scroll down to the Function code section …