AWS Route53 Routing Policies and How to Use Them

Route53 is an AWS-managed DNS service where you can set up domain name records and route them to AWS resources or use Route53 as your DNS servers.

Routing policies are a feature offered by Route53 that allow us to set up DNS routing to our resources based on different scenarios or requirements. When creating a DNS record in Route53, we will choose a routing policy.

For example, let’s say we have deployed a video streaming service in the cloud, and we need to route users from specific countries to specific video content due to copyright laws — in this case, we will use Route53.

The following are the routing policies available in Route53 -

1️⃣ Simple —

routes to a single resource that performs a given function for our domain (e.g., a simple website that returns content).

2️⃣ Weighted —

routes traffic to multiple resources in proportions that we specify, based on weights.

3️⃣ Failover —

routes traffic to alternative resources based on a failing health check. Use this when you want to configure an active-passive failover strategy.

4️⃣ Geolocation —

used when we want to route traffic based on the location of our users. The example above is a scenario where we will use a geolocation routing policy.

5️⃣ Latency —

used when we have resources in multiple AWS Regions and we want to route traffic to the Region that provides the best latency.

6️⃣ Geo Proximity —

used when we want to route traffic based on the location of our resources and, optionally, shift traffic from resources in one location to resources in another location based on an added bias.

7️⃣ IP Address —

used when we want to route traffic based on the location of our users and have the IP addresses from which the traffic originates. We can use this to route traffic from Route53 to a resource hosted in an on-premise data center (Client IP-based).

8️⃣ Multivalue —

routes to multiple resources based on health checks. Use this when you want Route53 to respond to DNS queries with up to eight healthy records selected at random.

Checkout more details in AWS Documentation — https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/routing-policy.html

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