SNS(Simple Notification Service),AWS SNS

Amazon SNS is a highly available, durable, secure, fully managed pub/sub messaging service that enables you to decouple microservices, distributed systems, and event-driven serverless applications. Amazon SNS provides topics for high-throughput, push-based, many-to-many messaging.

Go to Simple Notification service

Create topic; Topic name MyTopiC

Type standard

Create topic

Name as Mytopic

Create topic

MyTopic created

Create subscription

Protocol Email

Create subscription

Status pending

See the Gmail

Confirm subscription

Subscription confirmed

Status confirmed

Example: Create IAM Role

Create a role

Trusted entity type; AWS service

Use case SNS; next

Next

Role name

Create role

See the ARN; copy ARN

Example; Create a SQS

Access policy; only the specified AWS account, IAM users and roles; paste the ARN

Create queue

Add a second subscription in SNS

Protocol; Amazon SQS and Endpoint [https://sqs.us-east-1.amazonaws.com/454836273704/Myqueue]

Create subscription

Subscription Added

Subscribe to Amazon SNS topic in SQS

Specify an Amazon SNS topic available for this queue; save

Publish message

Message details

Message body

Publish Message

Message received Gmail

Click send and receive messages

Poll for messages

Now message received in SQS

Example create an EC2 instance.

Here see that no alarm created in EC2 instance

Copy the instance ID

Example Go to Cloud Watch

All metrics

Search for any metric; here paste EC2 instance Id

Paste EC2 instance id

Choose EC2>Per-instance Metrics

Here see 17 metrics

Select CPU Utilization

Choose Graphed metrics

Choose bell icon for create alarm

Metric default

Conditions Greater/Equal 0; next

Send a notification to the following topic; Select an existing SNS topic; next

select an existing SNS topic

Alarm Name; CPU Utilization; next

Create Alarm

In alarm

Message received in Gmail

Message received in SQS

Now see alarm created in EC2