AWS SNS Setup using AWS CLI

Amazon Simple Notification Service (SNS) is a highly scalable, fully managed messaging service designed for both Application-to-Application (A2A) and Application-to-Person (A2P) communication.

• Enables asynchronous publisher-subscriber structures to keep application components microservices-decoupled.
• Instantly routes messages to subscribed endpoints without requiring constant client polling.
• Easily handles varied endpoint configurations such as SQS queues, Lambda functions, email, and SMS.
• Offers first-in-first-out messaging capability to support strict queue sequencing and deduplication.
• Permits direct access policy modifications to securely govern publishing and subscribing permissions.

Benefits

Using Amazon SNS offers several operational and architectural benefits for cloud deployment:

• Immediate Delivery: Employs push-based real-time communication to instantly update subscriber endpoints when events occur.
• Simplified Integration: Works natively with other AWS services, making it easy to wire together microservices.
• Flexible Communication: Delivers messages to diverse endpoints and devices simultaneously using customized protocols.
• Ordering Guarantees: Fully supports FIFO topics to prevent out-of-order message processing in financial or inventory workflows.

Create and Manage Amazon SNS Using AWS CLI

Step 1: Create an SNS Topic

• Open AWS CloudShell or your local terminal.
• Run the following command to create a new SNS topic:

aws sns create-topic --name gfg-topic

Step 2: Subscribe an Email Endpoint

• Run the following command:

aws sns subscribe \
  --topic-arn "arn:aws:sns:us-west-2:123456789012:gfg-topic" \
  --protocol email \
  --notification-endpoint "example@example.com"

• --topic-arn specifies the SNS topic ARN.
• --protocol email sets email as the notification method.
• --notification-endpoint defines the recipient email address.
• Open your email inbox.
• Click the confirmation link received from AWS SNS.

Step 3: Verify the Subscription

• Run the following command:

aws sns list-subscriptions-by-topic \
--topic-arn "arn:aws:sns:us-west-2:123456789012:gfg-topic"

Step 4: Publish a Message

• Run the following command:

aws sns publish \  
--topic-arn "arn:aws:sns:us-west-2:123456789012:gfg-topic" \
--message "Hello Geeks"

Step 5: Check the Email Notification

• Open your email inbox.
• Verify that the notification email has been received.

Step 6: Unsubscribe from the Topic

• Run the following command:

aws sns unsubscribe \
--subscription-arn "arn:aws:sns:us-west-2:123456789012:gfg-topic:1328f057-de93-4c15-512e-8bb22EXAMPLE"

Step 7: Delete the SNS Topic

• Run the following command:

aws sns delete-topic \
--topic-arn "arn:aws:sns:us-west-2:123456789012:gfg-topic"

Step 8: Verify

• Run the following command:

aws sns list-topics