Cloud Intermediate

AWS Lambda Tutorial¶

AWS LambdaServerlessFaaS 3 min read

Serverless functions on AWS. Triggers, cold start, layers, and best practices.

Basic Lambda¶

// handler.js
exports.handler = async (event) => {
    const { name } = JSON.parse(event.body);
    return {
        statusCode: 200,
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ message: `Hello ${name}` })
    };
};

Triggers¶

• API Gateway — HTTP endpoints
• S3 — file upload events
• SQS — queue processing
• EventBridge — cron/schedule
• DynamoDB Streams — change data capture

Cold Start Mitigation¶

• Provisioned Concurrency (paid)
• SnapStart (Java)
• Smaller deployment package
• Warm-up pings (CloudWatch Events)

Summary¶

Lambda is ideal for event-driven, short-lived workloads. Watch out for cold start and vendor lock-in.

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