Summary

To make the applications running on Amazon EC2 highly available, we need to create a cluster of instances, run them in several availability zones, and provide access to the instances via a load balancer. There are three load balancer types available in AWS: the Application Load Balancer, the Network Load Balancer, and the Classic Load Balancer. Each of the load balancer types can be used for a certain type of application, and all load balancer types are deployed as managed services that are highly available. We took a look at building a load balancer and showing that the traffic was really distributed to multiple servers, and we learned how to decommission it because we pay for the existence of the load balancer and need to remove it when not needed to avoid incurring costs. In the next chapter, we will look into Amazon S3 service and how it is used to overcome the limitations...