Building an Event-Driven Architecture on AWS Using EventBridge and SNS for EC2 State Notifications

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Event-driven architectures are the core of modern cloud systems. They allow applications to react automatically to changes, without needing constant manual intervention or polling mechanisms.

In this lab, I implemented an event-driven workflow that monitors EC2 instance state changes and sends email notifications whenever an instance transitions between states, using Amazon EventBridge and Amazon Simple Notification Service (SNS).

Architecture Overview

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Goal:


Trigger an email notification whenever an EC2 instance starts, stops, or terminates.

Services Involved:

• 
  Amazon EC2 – the compute instance whose state we’re monitoring.
  
  
• 
  Amazon EventBridge – to capture EC2 state change events.
  
  
• 
  Amazon SNS – to send notifications to subscribers (email).
  

Flow:

1. 
   An EC2 instance changes its state.
   
   
2. 
   EventBridge detects the state change event.
   
   
3. 
   EventBridge triggers an SNS topic.
   
   
4. 
   SNS sends an email notification to the subscribed user.
   

Steps I Followed

1. 
   Created an EC2 instance – a simple instance to monitor.
   
   
2. 
   Set up an SNS topic – and subscribed my email address to receive notifications.
   
   
3. 
   Created an EventBridge rule – configured it to listen for EC2 instance state change events.
   
   
4. 
   Added SNS as the target for the EventBridge rule.
   
   
5. 
   Tested it by starting and stopping the EC2 instance — and watched email notifications come in automatically.
   

Conclusion


This lab showed me how AWS services integrate seamlessly to create automated, reactive systems.
Even with a small setup like this, the principle is clear, that in cloud architecture, events drive efficiency.

I’m excited to explore more event-driven patterns using Lambda, SQS, and Step Functions next.

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