SNS

Expands to Simple Notification Service
AWS service to set up/operate/send notifications
AWS service coordinates and manages message sending to subscribing endpoints/clients
It follows publish-subscribe or pub-sub messaging model
clients get notifications by push mechanism instead of periodic polling
Add notification to software applications
supported protocols
- AWS SQS
- HTTP/S
- email
- SMS
- Lambda
clients types
- publishers/producers
  - asynchronous communication with subscribers.
  - produce and send message to a topic (a logical access point and communication channel)
subscribers/consumers
- receive message on supported protocols
- can be
  - web servers
  - email addresses
  - SQS queues
  - Lambda functions
Used for
- event notification
- monitoring applications
- workflow systems
- time-sensitive information updates
- mobile applications
Steps
create an SNS topic
publish messages
- create a topic, or access point to identify a specific subject or event type
  - for publishing messages and allowing clients to subscribe for notifications.
- topic owner sets policies for access control, limits for publishing, protocol to use etc
- consumers subscribe to receive notifications for a topic
  - specify protocol and end-point email/URL
It sends time essential messages to multiple subscribers using push mechanism
SNS integrates with CloudTrail,for logging SNS API calls
Delivery formats
- HTTP, HTTPS
- Email, Email-JSON
- SQS
- SMS