AWS Global Accelerator
Developer Guide

AWS Global Accelerator Components

Global Accelerator includes components that work together to help you improve the availability and performance of your applications:

Static IP addresses

AWS Global Accelerator provides you with a set of two static IP addresses that are anycast from the AWS edge network. The IP addresses serve as single fixed entry points for your clients. If you already have Elastic Load Balancing load balancers, EC2 instances, or Elastic IP address resources set up for your applications, you can easily add those to Global Accelerator. This allows Global Accelerator to use static IP addresses to access the resources.

The IP addresses are assigned to your accelerator for as long as it exists, even if you disable the accelerator and it no longer accepts or routes traffic. However, when you delete an accelerator, you lose the static IP addresses that are assigned to the accelerator, so you can no longer route traffic by using them. As a best practice, ensure that you have permissions in place to avoid inadvertently deleting accelerators. You can use IAM policies with Global Accelerator to limit the users who have permissions to delete an accelerator. For more information, see Authentication and Access Control for AWS Global Accelerator.

Accelerator

An accelerator directs traffic to optimal endpoints over the AWS global network to improve the availability and performance of your internet applications. Each accelerator includes one or more listeners.

DNS name

Global Accelerator assigns each accelerator a default Domain Name System (DNS) name, similar to a1234567890abcdef.awsglobalaccelerator.com, that points to the static IP addresses that Global Accelerator assigns to you. Depending on the use case, you can use your accelerator's static IP addresses or DNS name to route traffic to your accelerator, or set up DNS records to route traffic using your own custom domain name.

Network zone

A network zone services the static IP addresses for your accelerator from a unique IP subnet. Similar to an AWS Availability Zone, a network zone is an isolated unit with its own set of physical infrastructure. When you configure an accelerator, Global Accelerator allocates two IPv4 addresses for it. If one IP address from a network zone becomes unavailable due to IP address blocking by certain client networks, or due to network disruptions, client applications can retry on the healthy static IP address from the other isolated network zone.

Listener

A listener processes inbound connections from clients to Global Accelerator, based on the protocol and port (or port range) that you configure. Each listener has one or more endpoint groups associated with it, and traffic is forwarded to endpoints in one of the groups. You associate endpoint groups with listeners by specifying the Regions that you want to distribute traffic to. Traffic is distributed to optimal endpoints within the endpoint groups associated with a listener.

Endpoint group

Each endpoint group is associated with a specific AWS Region. Endpoint groups include one or more endpoints in the Region. You can increase or reduce the percentage of traffic that would be otherwise directed to an endpoint group by adjusting a setting called a traffic dial. The traffic dial lets you easily do performance testing or blue/green deployment testing for new releases across different AWS Regions, for example.

Endpoint

Endpoints can be Network Load Balancers, Application Load Balancers, EC2 instances, or Elastic IP addresses. An Application Load Balancer endpoint can be an internet-facing or internal. Traffic is routed to endpoints based on configuration options that you choose, such as endpoint weights. For each endpoint, you can configure weights, which are numbers that you can use to specify the proportion of traffic to route to each one. This can be useful, for example, to do performance testing within a Region.