Creating a CloudWatch Events Rule That Triggers on an Event
- Event source. Choose Event Pattern, Build event pattern to match events by service . For Service Name, choose the service that emits the event to trigger the rule.
- Targets. In the other fields in this section, enter information specific to this target type, if any is needed.
- Configure details. For Rule definition, type a name and description for the rule. The rule name must be unique within this Region.
- In the navigation pane, choose Events, Create rule.
- For Event source, choose Schedule.
- Choose Fixed rate of and specify how often the task is to run, or choose Cron expression and specify a cron expression that defines when the task is to be triggered.
How do I create a CloudWatch event rule?
To create a Cloudwatch Event Rule, search for cloudwatch and click on the result to go to the Cloudwatch dashboard. On the Cloudwatch dashboard, click on Rules under Events in the left panel. Here, click in "Create rule" to create your first rule to trigger a Lambda Function in your region.
How do I trigger a lambda function in CloudWatch?
On the Cloudwatch dashboard, click on Rules under Events in the left panel. Here, click in "Create rule" to create your first rule to trigger a Lambda Function in your region. Select the "Event Pattern" radio button, under Service Name select "EC2", select "EC2 instance state change notification" for Event Type.
What is Amazon CloudWatch events?
Amazon CloudWatch Events delivers a near real-time stream of system events that describe changes in Amazon Web Services (AWS) resources. Using simple rules that you can quickly set up, you can match events and route them to one or more target functions or streams. CloudWatch Events becomes aware of operational changes as they occur.
How to add alarm events in AWS CloudWatch?
aws cloudwatch set-alarm-state --alarm-name "myalarm" --state-value ALARM --state-reason "testing purposes" Alternatively you can put a custom event, also using the CLI or the SDKs
How do I know if CloudWatch event is triggered?
If the rule is triggered by an event from an AWS service, you can also use the TestEventPattern action to test the event pattern of your rule with a test event to make sure the event pattern of your rule is correctly set. For more information, see TestEventPattern in the Amazon CloudWatch Events API Reference.
How do I trigger my CloudWatch alarm?
To create an alarm Open the CloudWatch console . Choose Alarms. Choose Create alarm. Choose Alarms.
How do you trigger the CloudWatch event from Lambda?
To configure EventBridge (CloudWatch Events) to invoke your functionOpen the Functions page of the Lambda console.Choose a function.Under Function overview, choose Add trigger.Set the trigger type to EventBridge (CloudWatch Events).For Rule, choose Create a new rule.Configure the remaining options and choose Add.
How do I trigger a step function in CloudWatch?
Under Event pattern, do the following:In the Event source dropdown list, keep the default selection of AWS services.From the AWS service dropdown list, choose Step Functions.From the Event Type dropdown list, choose Step Functions Execution Status Change.More items...
How do you test a CloudWatch event?
To test your rule Open the CloudWatch console at https://console.aws.amazon.com/cloudwatch/ . In the navigation pane, choose Events, Rules, select the name of the rule that you created, and choose Show metrics for the rule.
What is a CloudWatch event?
Amazon CloudWatch Events delivers a near real-time stream of system events that describe changes in Amazon Web Services (AWS) resources. Using simple rules that you can quickly set up, you can match events and route them to one or more target functions or streams.
How do you trigger a Lambda function?
Lambda Functions can be triggered in different ways: an HTTP request, a new document upload to S3, a scheduled Job, an AWS Kinesis data stream, or a notification from AWS Simple Notification Service (SNS).
How do you add a trigger to a Lambda function?
Adding triggers by using the Lambda consoleIn the Region list at the top of the page, choose US East (N. ... On the Functions page, choose the name of the function that you want to add triggers for.Choose Qualifiers, and then choose the Versions tab.Choose the version that you want to add triggers to.More items...
What is the difference between CloudWatch alarm and event?
An event triggers when it is created or according to a schedule, but an alarm needs a threshold reached. So, our first difference between an alarm and an event is how they are triggered. A CloudWatch alarm watches a metric for a specific period and triggers if it exceeds above or decreases below a threshold you define.
How do you trigger a step function?
Step Functions can be triggered in four ways :API Gateway.CloudWatch Events.S3 events.Step Functions API – StartExecution.
How do you trigger a step function from an event bridge?
0:075:58Amazon EventBridge - Integrating events with AWS Step FunctionsYouTubeStart of suggested clipEnd of suggested clipYou can configure an eventbridge rule to start a step function state machine by defining it as aMoreYou can configure an eventbridge rule to start a step function state machine by defining it as a target. However you can also have a state machine send events to eventbridge.
How do you trigger Lambda on a schedule?
Step 1: Create a Lambda function. Create a Lambda function to log the scheduled events. ... Step 2: Create a Rule. Create a rule to run the Lambda function you created in step 1 on a schedule. ... Step 3: Verify the rule. ... Step 4: Confirm success. ... Step 5: Clean up your resources.
What actions can I take from a CloudWatch alarm?
Using Amazon CloudWatch alarm actions, you can create alarms that automatically stop, terminate, reboot, or recover your EC2 instances. You can use the stop or terminate actions to help you save money when you no longer need an instance to be running.
How do you make a CloudWatch alarm for RDS?
ResolutionOpen the CloudWatch console.Under Alarms in the navigation pane, choose All alarms.Choose Create alarm, and then choose Select metric.Search for the FreeStorageSpace metric.Choose RDS, and then choose Per-Database metrics.More items...
How do you make a billing alarm?
Creating the CloudWatch Billing Alarm To create the billing alarm, you must first navigate to the CloudWatch console. From the CloudWatch console, select Alarms from the navigation on the left side, then select Create Alarm. From the Specify metric and conditions page, choose Select metric.
How do I set up CloudWatch?
To install and configure CloudWatch Logs on an existing Amazon Linux instanceConnect to your Amazon Linux instance. ... Update your Amazon Linux instance to pick up the latest changes in the package repositories. ... Install the awslogs package. ... Edit the /etc/awslogs/awslogs. ... By default, the /etc/awslogs/awscli.More items...
Concepts
Before you begin using CloudWatch Events, you should understand the following concepts:
Related AWS Services
The following services are used in conjunction with CloudWatch Events:
Create a Cloudwatch Event to trigger a Lambda Function
To create a Cloudwatch Event Rule, search for cloudwatch and click on the result to go to the Cloudwatch dashboard.
Conclusion
In this article, we saw how to create a Cloudwatch Event Rule which indicates the change in the EC2 instance state and triggers the Lambda Function when the rule matches the event. You can select the target of your choice.
Short Description
CloudWatch alarms that measure time-aggregated metrics (such as five-minute averages) perform this measurement continuously in a rolling window. If any data points collected during the evaluation period don't exceed the configured threshold, the CloudWatch alarm isn't triggered.
Resolution
Be sure to consider the mechanism used by CloudWatch to measure time-aggregated metrics when you create alarms.
