Learn how to schedule an AWS Lambda function to run daily using Amazon EventBridge. This guide explains why EventBridge is the best choice for automating tasks in AWS.
Table of Contents
Question
A company’s application stores data in an Amazon S3 bucket. The company has an AWS Lambda function that processes data in the S3 bucket. The company needs to invoke the function once per day at a specific time.
A. AWS Managed Services (AMS)
B. AWS CodeStar
C. Amazon EventBridge
D. AWS Step Functions
Answer
To invoke an AWS Lambda function once per day at a specific time, the correct answer is C. Amazon EventBridge. Below is a detailed explanation of why this is the best option and how it works.
Explanation
Amazon EventBridge allows you to create scheduled rules that trigger your targets at a specific time or interval, such as once per day. AMS provides operational management, AWS CodeStar manages software development projects, and AWS Step Functions coordinates serverless workflows.
Why Amazon EventBridge Is the Correct Choice
Amazon EventBridge is a serverless event bus that allows you to create rules for triggering events based on schedules or patterns. It supports cron and rate expressions, making it ideal for scheduling tasks like invoking a Lambda function daily at a specific time.
Key benefits of using EventBridge for scheduling:
- Flexibility: Supports cron expressions for precise scheduling.
- Scalability: Automatically scales to handle high volumes of scheduled events.
- Cost-Effectiveness: You only pay for the events processed, avoiding the need for dedicated servers.
- Reliability: Ensures consistent execution of scheduled tasks.
Why Not the Other Options?
AWS Managed Services (AMS): AMS focuses on operational management and governance, not event scheduling.
AWS CodeStar: Primarily used for managing software development workflows, not scheduling Lambda functions.
AWS Step Functions: While Step Functions can include “Wait” states for delays, they are better suited for orchestrating workflows rather than simple periodic scheduling.
How to Schedule a Lambda Function Using Amazon EventBridge
Follow these steps to set up a daily schedule:
- Create Your Lambda Function:
- Go to the AWS Management Console and create or identify the Lambda function you want to invoke.
- Ensure it has appropriate IAM permissions (e.g., CloudWatch Logs access).
- Set Up an EventBridge Rule:
- Navigate to the Amazon EventBridge console.
- Choose “Rules” and click “Create Rule.”
- Name your rule and select “Schedule” as the rule type.
- Use a cron expression (e.g., 0 12 * * ? *) to specify daily execution at 12:00 PM UTC.
- Define the Target:
- In the “Targets” section, choose “AWS Lambda Function.”
- Select your Lambda function from the dropdown list.
- Test and Monitor:
- Save your rule and verify its functionality by checking CloudWatch Logs after execution.
Example Cron Expression
To run a Lambda function daily at 8:00 AM IST:
30 2 * * ? *
This accounts for IST being UTC+5:30. By leveraging Amazon EventBridge, you can efficiently automate repetitive tasks like invoking Lambda functions on a daily schedule. This approach ensures scalability, reliability, and cost-effectiveness within your AWS environment.
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