AWS Lambda Triggers

Learn how to trigger Lambda functions from S3 events and API Gateway requests for event-driven architectures.

lambda-triggers-config.json
{
"LambdaFunction": "my-function",
"Trigger": "S3",
"Event": "s3:ObjectCreated"
}
lambda-triggers-config.json
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Tutor:Lambda functions can be triggered by various AWS services. S3 can trigger Lambda when objects are created, deleted, or modified. API Gateway can trigger Lambda functions to handle HTTP requests. This enables event-driven, serverless architectures.


Lambda Triggers Mastery

Unlock nodes by learning new Lambda trigger concepts.

Concept 1: S3 Triggers

S3 event notifications can trigger Lambda functions when specific events occur in a bucket. You configure event notifications on the S3 bucket, specifying which events (e.g., s3:ObjectCreated) should trigger which Lambda function. The Lambda function receives event data about the S3 object.

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What can trigger Lambda functions from S3?

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Triggering Lambda from S3/API Gateway

Author

Pascual Vila

Cloud Instructor.

Lambda functions can be triggered by various AWS services. S3 can trigger Lambda when objects are created, deleted, or modified. API Gateway can trigger Lambda functions to handle HTTP requests, enabling event-driven, serverless architectures.

S3 Event Triggers

S3 event notifications can trigger Lambda functions when specific events occur in a bucket. You configure event notifications on the S3 bucket, specifying which events (e.g., s3:ObjectCreated) should trigger which Lambda function. The Lambda function receives event data about the S3 object.

API Gateway Triggers

API Gateway can trigger Lambda functions to handle HTTP requests. You create an API Gateway REST API or HTTP API, configure routes and methods, and integrate them with Lambda functions. When a request comes to the API, it triggers the Lambda function to process the request.

Lambda Triggers Glossary

S3 Event Notification
A feature that allows S3 to trigger Lambda functions when specific events occur in a bucket, such as object creation, deletion, or modification.
API Gateway Integration
A connection between API Gateway and a Lambda function that allows HTTP requests to trigger the Lambda function. Can be Lambda proxy or Lambda non-proxy integration.
Lambda Proxy Integration
An API Gateway integration type that passes the entire HTTP request to the Lambda function and expects the function to return a properly formatted HTTP response.
Event-Driven Architecture
An architectural pattern where components communicate through events. Lambda functions are triggered by events from various AWS services, enabling decoupled, scalable systems.
Dead-Letter Queue (DLQ)
A queue that receives failed Lambda invocations. Used to handle errors and retry failed executions, improving system reliability.