EventBridge

💡 Definition

Amazon EventBridge is a serverless event bus service that makes it easy to connect your applications with data from a variety of sources. It was formerly known as Amazon CloudWatch Events.

🔑 Key Concepts

• Event Bus: A pipeline that receives events.
• Events: A signal that a system's state has changed (e.g., EC2 instance state changed to "running", S3 file uploaded).
• Rules: Filters that match incoming events and route them to targets.
• Targets: Services that process the events (e.g., Lambda, SNS, SQS, Kinesis).
• SaaS Integration: Can ingest events directly from partner SaaS applications (e.g., Zendesk, Shopify).

⚙️ How it Works

1. Source: An AWS service (e.g., EC2) generates an event ("Instance Stopped").
2. Bus: EventBridge receives the event.
3. Rule: A rule matches this event ("If source=EC2 and state=stopped").
4. Target: Triggers a Lambda function to "Update Database".

🎯 Use Cases

• Automated Response: Automatically remediating security issues.
• Decoupled Architecture: Building event-driven microservices.
• Scheduled Tasks: Running a Lambda function every night (replacing Cron).

💰 Pricing Model

• AWS Events: Free.
• Custom/SaaS Events: Charged per million events published.

📝 Exam Tips (CLF-C02)

• Serverless Event Bus.
• Ideally suited for event-driven architectures.
• Can handle Scheduled Events (Cron jobs).
• Successor to CloudWatch Events.

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See Also: * CloudWatch * Lambda * SNS