Amazon Elastic Compute Cloud (Amazon EC2) is a web service provides secure, reliable, scalable, and low-cost computational resources. It gives developers the tools to build virtually any web-scale application.
The Amazon SNS platform (SNS) is a web service that enables you to send an SMS or a text-enabled mobile push notification to targeted subscribers.
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Triggers when a new instance is created.
Triggers when a new event is scheduled for one of your instances.
Triggers when you add a new subscription.
Triggers when you add a new topic.
Start Stop or Reboot Instance
Create a new message.
Create a new topic.
Amazon EC2 is a web service for provisioning and managing of cloud computing instances, storage, images, etc. Amazon SNS (Simple Notification Service)is a highly scalable, low-cost cloud messaging solution. The integration of the two services provides you with more flexibility when scaling your applications as well as benefits when creating highly available applications.
In this section, we will be exploring how to integrate Amazon EC2 and Amazon SNS as well as the benefits of integration.
Amazon EC2 can be integrated with Amazon SNS by using an SQS queue. When events occur in the Amazon EC2 such as an ec2 instance being launched or stopped, it writes to an SQS queue. The amazon sns then picks up the messages off the queue and sends the messages to one or more subscribers.The following diagram illustrates how the interface works:
B. Benefits of IntegrationThe integration of Amazon EC2 and Amazon SNS offers several benefits. One benefit is the ability to create more flexible and cost effective applications. To illustrate this, consider a scenario where you have a set of AWS resources that need to be notified about availability changes. You could use a single topic to which all resources subscribe but if you have hundreds of resources this would be extremely expensive. Instead, you could use multiple topics. One topic per resource. Using the previous example, you would end up with N number of topics based on the number of resources. This would reduce the number of messages being sent to each individual event source from M to 1 which greatly reduces the cost of the solution. It also increases the speed at which you can process events since you are receiving them in parallel form multiple sources (the number of topics. instead of in series from one source(the single topic. With regards to availability, you can ensure that if one event source fails another source will pick up the message and deliver it to its subscribers. The advantage here is that you only need to design for one failure scenario. This can greatly reduce the overall complexity of your application and provide greater reliability than a single point of failure.The following diagram illustrates how the advantages can be obtained:
Amazon EC2 and Amazon SNS can be integrated to achieve more flexible and cost effective applications. One benefit is that you have multiple points of failure for your applications thus reducing the risk of failure in general. Another benefit is that by reducing the number of subscriptions required by your application you reduce costs.
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