17. Automating Recovery

Automating service recovery and creating "self-healing" systems can take you to the next level of system architecture. Some solutions are quite simple. Using autoscaling within AWS, you can handle single instance/server failures without missing a beat. These solutions will automatically replace a failed server or will create or delete servers based on the demand at any given point in time.

Beyond the simple tasks, many types of failure can be automatically recovered from, but this can involve significant work. Many failure events can generate notifications, either directly from the service, or via an alarm generated out of CloudWatch. These events can have a Lambda function attached to them, and from there, you can do anything you need to in order to recover the system. Do be cautious with this type of automation where you are, in essence, turning over some control of the platform - to the platform. Just like with a business application, there can be defects. However, as with any software, proper and thorough testing can help ensure a high-quality product.