Before we move to the setup, you need to know what the AWS Lambda service<\/strong> and the AWS EventBridge service<\/strong> are.<\/p>\n AWS EventBridge is a fully managed serverless event bus that lets you create custom events like cron expressions or capture events from AWS services and external applications. <\/p>\n These events can then be routed to targets<\/strong> like Lambda, SQS, or SNS<\/p>\n For example, if an EC2 instance goes down, EventBridge can automatically capture the event and send an email to the respective team.<\/p>\n It also helps in,<\/p>\n AWS Lambda is a serverless service where we can directly run our code without managing the servers.<\/p>\n To run our code, we can manually trigger the function or use any automatic trigger, such as an event from another service.<\/p>\n If you are new to AWS Lambda, check out our simple blog to deploy serverless framwork on AWS Lambda<\/a>.<\/p>\n Now, we can see the overview of the setup workflow.<\/p>\n The following is the workflow diagram of the integration of AWS EventBridge and Lambda.<\/p>\n Here is how the workflow looks.<\/p>\n Now, we can start the setup.<\/p>\n To achieve this setup, we need the following requirements.<\/p>\n Now, we can start the setup by creating a Lambda Function.<\/p>\n To begin the setup, you need to open the Lambda service and, from the home page, click the On the function creation page, select the option of For this, I am choosing the Python<\/a> 3.13 runtime, and I am keeping the rest of the configuration as the default.<\/p>\n When scrolling down, you can see a section to create an IAM Role for your Lambda function. <\/p>\n This IAM Role defines the permissions of which AWS services that the Lambda can access.<\/p>\n For example, if I write a script for Lambda to list S3 buckets, it needs the required permission to access the S3.<\/p>\n So in the execution role section, I am selecting “Create a new role with basic Lambda permissions” to create a Role.<\/p>\n But if you already have an existing role with the necessary permissions, you can use that as well.<\/p>\n On the same page, you can also configure networking and Encryption using KMS. You can configure them if required.<\/p>\n The basic IAM Role will have permission to CloudWatch<\/strong> to write the Lambda logs, but we need to add the S3<\/strong> permission on this Role.<\/p>\n Once the role creation is completed, open the created IAM Role and add the S3 permission.<\/p>\n Now, we have our IAM Role ready for the Lambda function with required permission.<\/p>\n Once the function is created, you will reach a page similar to the following one.<\/p>\n Now, we need to configure the Function code.<\/p>\n For demo, I am adding a Boto3 script to list the S3 buckets and their object details. <\/p>\n Now, we need to create an event to trigger this lambda function automatically.<\/p>\n We are now selecting one specific configuration in EventBridge.<\/p>\n We will create a Rule with a scheduling expression to define how often it should run.<\/p>\n In our case, the Rule will periodically (e.g., every 5 min) trigger the Lambda function that we created in the previous step.<\/p>\n Open the EventBridge service from the console, select the rules section, and click On the first page, give a name to the rule and select the rule type as On the next page, you will see two schedule patterns, which are “One time schedule” and “Recurring schedule”.<\/p>\n We select the recurring schedule to configure the cron expression.<\/p>\n Unlike the regular cronjob, EventBridge cron expression has an additional field to add the year.<\/p>\n Also, choose the flexible time window option to “Off”, but if you want, set when the EventBridge rule should start.<\/p>\n There are additional configurations, such as timeframes, that you can configure if required. For now, we are keeping the rest of the configurations as default values.<\/p>\n On the next page, you need to select the target.<\/strong> In our case, it is Lambda<\/strong>. Once you select Lambda, you will get a list to select the Lambda function.<\/p>\n On the next page, you can configure the settings, such as scheduling state, after completion action, retry policy, encryption, and permissions. You can customize them if required.<\/p>\n On the last page, you can review all the configurations that you have given, and then schedule the rule. <\/p>\n Let’s wait a few minutes to trigger the first event. Once the event is triggered, the metrics and logs will be stored in CloudWatch.<\/p>\n To see the logs, scroll down the page where you can see the execution logs.<\/p>\n Clicking the log stream will show you the execution steps.<\/p>\n This ensures that the EventBridge Rule is triggering the Lambda function. You can extend this with your use cases like, send this report as an email using SES.<\/p>\n Now, we can start the cleanup process <\/p>\n Let’s start by disabling the event and deleting the rule from the EventBridge<\/p>\n Disabling the event will not trigger the lambda function, so if we need it again, we can enable it again.<\/p>\n Now, we can delete the event rule.<\/p>\n Once the EventBridge Rule is deleted, we can delete the Lambda function.<\/p>\n Now, we have cleaned up the entire setup.<\/p>\n Following are some of the key DevOps use cases for EventBridge in enterprise environments.<\/p>\n The event driven workflow is quite vast, so depending on your use cases, you can configure them with other services.<\/p>\n Both the services are serverless so you will pay for what you use. The pricing of the AWS EventBridge<\/a> and Lambda<\/a> depends on the events, requests, and the duration of the execution.<\/p>\nWhat is AWS EventBridge?<\/h2>\n
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What is AWS Lambda?<\/h2>\n
EventBridge + Lambda Workflow<\/h2>\n
![\"EventBridge](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/08\/image-49.png\")
<\/figure>\n\n
Setup Prerequisites<\/h2>\n
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Creating a Lambda Function<\/h2>\n
Create a function<\/code> button to create a function.<\/p>\n![\"The](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/08\/image-1.png\")
<\/figure>\nAuthor from scratch<\/code> to create your own function, give a name to the function, and select a runtime where you are comfortable to write scripts.<\/p>\n![\"the](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/08\/image-2.png\")
<\/figure>\n![\"The](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/09\/image-4.png\")
<\/figure>\n![\"the](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/09\/image-5.png\")
<\/figure>\n![\"the](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/08\/image-4.png\")
<\/figure>\nimport boto3\n\n# This script lists all S3 buckets and their objects using the Boto3 library in Python.\ns3 = boto3.client('s3')\n\nlist_buckets = s3.list_buckets()\n\nbucket_names = [bucket['Name'] for bucket in list_buckets['Buckets']]\nfor bucket in bucket_names:\n print(bucket) \n\ndef list_objects_in_bucket():\n list_objects = s3.list_objects(\n Bucket = source_bucket\n )\n if 'Contents' in list_objects:\n for obj in list_objects['Contents']:\n print(f\"Object: {obj['Key']}, Last Modified: {obj['LastModified']}, Size: {obj['Size']} bytes\")\n else:\n print(\"No objects found in the bucket.\")\n\nfor source_bucket in bucket_names:\n print(f\"Source Bucket: {source_bucket}\")\n list_objects_in_bucket()\n<\/code><\/pre>\n![\"the](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/08\/image-46.png\")
<\/figure>\nConfiguring AWS EventBridge Rule<\/h2>\n
Create rule<\/code> to configure a rule.<\/p>\n![\"the](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/08\/image-6.png\")
<\/figure>\nSchedule<\/code><\/p>\n![\"the](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/08\/image-7.png\")
<\/figure>\n![\"the](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/08\/image-8.png\")
<\/figure>\n![\"The](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/09\/image-6.png\")
<\/figure>\n![\"The](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/08\/image-10.png\")
<\/figure>\n![\"the](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/08\/image-11.png\")
<\/figure>\n![\"the](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/08\/image-12.png\")
<\/figure>\nTesting the Setup<\/h2>\n
![\"the](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/08\/image-13.png\")
<\/figure>\n![\"the](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/08\/image-14.png\")
<\/figure>\n![\"the](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/08\/image-50.png\")
<\/figure>\nCleanup the Setup<\/h2>\n
![\"the](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/08\/image-16.png\")
<\/figure>\n![\"deleting](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/08\/image-17.png\")
<\/figure>\n![\"deleting](\"https:\/\/storage.ghost.io\/c\/5f\/2f\/5f2f4d20-2abf-4534-8d40-7aa233aedd43\/content\/images\/2025\/08\/image-18.png\")
<\/figure>\nDevOps Use cases<\/h2>\n
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Conclusion<\/h2>\n
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