SNS

Solution Architect Associate

Developer Associate

Security Specialty

Cost effective way to publish messages from an application and send messages
Commonly used when auto scaling or failures occur
Can push notifications to Apple, Google, FireOS, and Windows
Instantaneous Push messaging system, unlike SQS which is pull only
Allows you to group multiple recipients of a notification using topics
One topic can group deliveries to multiple delivery types
To prevent message lost, messages are stored redundantly across AZs
You can manually create subscriptions to topics via the AWS console. You typically have to confirm subscriptions to avoid spamming
Pay as you go model, no up front costs
- $0.50 for first million notifications, then pricing goes by delivery type
Supports
- HTTP, HTTPS, Email, Email-JSON, SQS, Application, Lambda

Important Settings

Subscribers: Kinesis Data Firehose, SQS, Lambda, Email, HTTP(s), SMS, other platform application endpoints
Message Size: Messages can be up to 256 KB of text in any format
Support for Dead Letter Queues
FIFO and Standard SNS, but FIFO only supports SQS. So you usually use Standard
Encryption: Encrypted in transit by default, can be configured to support encryption at rest by choosing a KMS key
Access Policy: A resource policy can be applied similar to S3