How do I provision an AWS CloudWatch Event Rule?

Introduction

In this example, we will demonstrate how to provision an AWS CloudWatch Event Rule. CloudWatch Event Rules allow you to respond to state changes in your AWS resources. You can define rules that match specific events and automate actions when these events occur.

The code snippets will include:

1. Defining an AWS CloudWatch Event Rule
2. Setting a simple event pattern to trigger on an event

Key Points:

• Using aws_cloudwatch_event_rule to define the event rule.
• Writing an event pattern to match specific events.
• Exporting the event rule ARN as a stack output.

The Code

import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

// Define a CloudWatch Event Rule
const example = new aws.cloudwatch.EventRule("example", {
    name: "example-event-rule",
    description: "A rule to catch specific events",
    eventPattern: `{
  "source": [
    "aws.ec2"
  ],
  "detail-type": [
    "EC2 Instance State-change Notification"
  ],
  "detail": {
    "state": [
      "pending"
    ]
  }
}
`,
});
export const exampleCloudwatchEventRuleArn = example.arn;

Conclusion

We crafted an AWS CloudWatch Event Rule that triggers on EC2 instance state changes specifically when they are in a ‘pending’ state. The key resource is aws_cloudwatch_event_rule, which is configured with an event_pattern to match these specific events. We also export the ARN of the rule for further use or reference in your stack.

By following these instructions, you can easily create event-driven architectures that respond to changes in your AWS environment programmatically.