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Cloudwatch Events

AWS CloudWatch Events enables you to respond to state changes in your AWS resources. By setting up simple rules, you can easily route each event to one or more target functions or streams. With CloudWatch Events, you can centralize the management of your AWS resource events, making it easy to respond quickly to system-wide changes.

CloudWatch Events is a feature of Amazon CloudWatch that provides a near real-time stream of system events that describe changes in Amazon Web Services (AWS) resources. Using CloudWatch Events, you can route the events to AWS Lambda functions, streams, and built-in targets. This enables you to build sophisticated event-driven applications using services like Lambda to process your log data in near real time.

Cloudwatch Events


What is Cloudwatch Events Rule?

CloudWatch Events rule is a tool that helps you to automate your Amazon Web Services (AWS) account by creating rules that watch for specific events in the AWS CloudTrail event log and then take action based on those events. With CloudWatch Events, you can respond quickly to application deployment changes, auto-scaling activity, or system failures. You can also use CloudWatch Events to schedule automated actions that call other AWS services such as Lambda functions, Step Functions state machines, Amazon ECS tasks, Batch jobs, or AWS CodePipeline pipelines.

Is Cloudwatch Events the Same As Eventbridge?

CloudWatch Events is a near real-time stream of system events that describe changes in Amazon Web Services (AWS) resources. These events are already present in AWS and don’t require any specific setup from the user. They can be used to trigger Lambda functions, Step Functions state machines, ECS tasks, Batch jobs, etc.

EventBridge is a serverless event bus service that makes it easy to connect applications together using data from your own apps, integrated Software-as-a-Service (SaaS) providers, and AWS services.

How Do You Trigger Events in Cloudwatch?

CloudWatch is a monitoring service for Amazon Web Services (AWS) that provides data and actionable insights to help operators improve their AWS resource utilization and costs. CloudWatch can be used to collect and track metrics, set alarms, and automatically react to changes in your AWS resources. In order to trigger events in CloudWatch, you first need to create a rule.

A rule defines the criteria for triggering an event and can be based on one or more CloudWatch metrics, a schedule, or an Amazon SNS topic. Once you have created a rule, you can specify the actions that should take place when the rule is triggered. These actions can include sending an Amazon SNS notification or invoking an AWS Lambda function.

How Do Cloudwatch Events Differ from Cloudwatch Alarms?

CloudWatch alarms are used to monitor a single metric over a specified time period. Alarms can be set to trigger when the metric exceeds a certain threshold, or falls below a certain threshold. CloudWatch events are used to monitor changes in AWS resources.

Events can be generated by AWS services, by Amazon S3 bucket notifications, or by custom applications.

How to Configure CloudWatch Events

Cloudwatch Events Pricing

AWS CloudWatch Events pricing is based on the number of events delivered to your AWS account. You can view your account’s current price by visiting the AWS CloudWatch Events console and selecting Account Settings from the navigation pane. The first 10,000 events in a month are free, and each additional event costs $0.05 per month.

Cloudwatch Events Schedule

If you’re looking for a way to automate your AWS infrastructure, CloudWatch Events is a great option. With CloudWatch Events, you can schedule tasks or run scripts in response to events that occur in your AWS environment. In this blog post, we’ll take a look at how to set up and use CloudWatch Events to schedule tasks in your AWS environment.

First, let’s take a look at the basics of CloudWatch Events. CloudWatch Events consists of two parts: Rules and Targets. Rules define the conditions under which a target will be invoked.

Targets are the resources that will be invoked when a rule is triggered. When you create a rule, you specify the event pattern that will trigger the rule. The event pattern must match the format of an Amazon CloudWatch Event.

Once you’ve created a rule, you need to specify one or more targets for the rule. A target can be an AWS Lambda function, an Amazon Kinesis stream, an Amazon SNS topic, or an Amazon SQS queue. When the specified event occurs, CloudWatchEvents will invoke the specified target with the matching event data.

Now that we’ve covered the basics of CloudWatch Events, let’s take a look at how to use them to schedule tasks in your AWS environment. To do this, we’ll first create a Lambda function that will perform our task when it is invoked by CloudWatch Events. Then we’ll create a rule that specifies when our Lambda function should be invoked by setting up a cron expression in the Rule Pattern field .

Finally , we’ll add our Lambda function as a target for our rule so that it gets invoked when our cron expression is met . Let’s say we want to run our Lambda function every day at 9:00am UTC . We would first need to write our Lambda function and then zip it up so it can be uploaded as part of our cloudformation stack .

Our template would look something like this: Resources: MyLambdaFunction: Type: “AWS::Lambda::Function” Properties: FunctionName : !Ref “MyLambdaFunction”

Cloudwatch Events Terraform

If you’re using AWS and Terraform together, you may want to consider using CloudWatch Events to trigger changes in your infrastructure. CloudWatch Events is a powerful tool that can help you automate your AWS infrastructure. With CloudWatch Events, you can create rules that trigger actions in response to events in your AWS account.

For example, you could create a rule that triggers an Amazon SNS notification when an instance is launched in your account. Or, you could create a rule that automatically scales up your Amazon EC2 instances when CPU utilization exceeds 75%. CloudWatch Events is easy to use with Terraform.

You can simply add a cloudwatch_event resource to your Terraform configuration and specify the rule that should be used. When the rule is triggered, Terraform will automatically apply the changes to your infrastructure. Using CloudWatch Events with Terraform can help you save time and effort by automating tasks that would otherwise require manual intervention.

It’s a great way to streamline your workflow and make sure that your infrastructure is always up-to-date.

Eventbridge Vs Cloudwatch Events

If you’re working with AWS, then you’ve probably heard of Amazon EventBridge. It’s a managed event bus that makes it easy to connect applications together using data from your AWS services. EventBridge lets you send events to multiple targets, including Lambda functions, Kinesis streams, and SQS queues.

CloudWatch Events is another AWS service that can be used to process events. CloudWatch Events is mostly used for monitoring purposes, but it can also be used to trigger Lambdas and other actions. So, which one should you use?

Let’s compare the two services: Amazon EventBridge: – Supports multiple targets (Lambda functions, Kinesis streams, SQS queues)

– Easy to set up and use – Can be used for more than just monitoring purposes (can also trigger actions) – integrates with many AWS services out of the box

Cloudwatch Events Lambda

AWS Lambda is a compute service that lets you run code without provisioning or managing servers. AWS Lambda executes your code only when needed and scales automatically, from a few requests per day to thousands per second. You pay only for the compute time you consume – there is no charge when your code is not running.

With Lambda, you can run code for virtually any type of application or backend service – all with zero administration. Just upload your code and Lambda takes care of everything required to run and scale your code with high availability. You can use AWS Lambda to process records in your Amazon Kinesis streams, respond to events in Amazon S3 buckets, or build entirely new applications written in serverless architectures.

These are just a few examples; many other services send events that AWS Lambda can respond to. For example, CloudTrail log files are delivered to an Amazon S3 bucket, and you can configure Amazon SNS notifications whenever someone calls the CloudTrail API on one of your account’s resources. To learn more about how services integrated with AWS LambdaTrigger see What Services Can Trigger an AWS Lambda Function?

CloudWatch Events introduces the concept ofEvents as a Service (EaaS). An event represents a record of activity in your account, such as calling the CloudTrail API to create a trail, updating settings on an Amazon S3 bucket, or adding users to an IAM group. When these activities occur, they generate events that contain information describing the activity that triggered them .

These events can be useful for auditing purposes because they provide insight into who did what within your account . They also enable security analysis and compliance auditing , resource change tracking , workflow automation , application monitoring , chatbots , and event-driven serverless applications . Lambdas are perfect for responding quickly to these kinds of Events: all you needto do is write some code and upload it into a ZIP file using the console or CLI .

YourLambda function will then be invoked whenever the specified Event occurs . In this wayyou can easily extend the functionality of many existing services without having toprovide any infrastructure yourself !

Cloudwatch Event Rule

CloudWatch Event Rule A CloudWatch Event Rule defines when and how often to trigger an event based on certain conditions. You can use CloudWatch Events Rules to schedule regular events such as code deployments or maintenance windows, or you can respond to real-time system events such as application crashes or instance failures.

In this blog post, we’ll take a look at how to create and manage CloudWatch Event Rules using the AWS Management Console. First, navigate to the CloudWatch Events service page and click “Create rule”. On the next page, you’ll need to select a rule type.

For this example, we’ll choose “Schedule” so that we can define a regular event interval: Next, enter a name and description for your rule. Then, specify the schedule interval that you want the rule to trigger on.

In this case, we’ll choose “5 minutes”: Now it’s time to specify the actions that should be taken when your rule is triggered.

Cloudwatch Events Example

CloudWatch Events allows you to respond to state changes in your AWS resources. With CloudWatch Events, you can create rules that match event patterns in your resource activity streams. For example, you can configure rules to:

– Automatically react to changes in Amazon EC2 instance state, such as when an instance is launched or terminated. – Detect incomplete multipart uploads to Amazon S3 buckets and automatically invoke a Lambda function to complete the upload. – Inspect incoming Amazon Kinesis records and take custom action based on the content of the record.

– Monitor API calls made using AWS Identity and Access Management (IAM) and take action on unauthorized calls. You can set up CloudWatch Events rules in the AWS Management Console or by using the AWS Command Line Interface (CLI).

Cloudwatch Events Dynamodb

If you’re using AWS Lambda in conjunction with Amazon DynamoDB, then you may want to take advantage of CloudWatch Events. This is a feature that allows you to trigger Lambda functions in response to certain events that occur within your DynamoDB table. For example, you could use CloudWatch Events to send an email notification whenever a new item is added to your DynamoDB table.

In order to set up CloudWatch Events for your DynamoDB table, you first need to create an IAM role that gives Lambda permission to access DynamoDB. You can then create a CloudWatch Events rule that specifies the event source (DynamoDB) and the event type (e.g., insert). Finally, you need to specify the Lambda function that should be invoked when the rule is triggered.

Once everything is set up, CloudWatch Events will automatically invoke your Lambda function whenever the specified event occurs within your DynamoDB table. This can be a great way to automate certain tasks or notifications based on data changes in DynamoDB.


CloudWatch Events is a near real-time stream of system events that describe changes in Amazon Web Services (AWS) resources. Using CloudWatch Events, you can detect when AWS resources are created, terminated, or changed, and take automated actions in response to these events. You can also use CloudWatch Events to schedule automated actions that self-trigger based on state changes in your AWS resources.

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