Weighted routing

With weighted routing, you can link multiple resources to a single domain name (example.com) or subdomain name (acme.example.com) and choose how much traffic goes to each resource. This can be useful for load balancing and testing new versions of software.

To set up weighted routing, you create records with the same name and type for each of your resources. You give each record a relative weight that matches how much traffic you want to send to each resource. Amazon Route 53 sends traffic to a resource based on the weight you assign to the record as a share of the total weight for all records in the group:

For example, if you want to send a tiny part of your traffic to one resource and the rest to another resource, you might set weights of 1 and 255. The resource with a weight of 1 gets 1/256th of the traffic (1/(1+255)), and the other resource gets 255/256ths (255/(1+255)). You can slowly change the balance by changing the weights. If you want to stop sending traffic to a resource, change the weight for that record to 0.

For information about values that you specify when you use the weighted routing policy to create records, see the following topics:

You can use weighted routing policy for records in a private hosted zone.

Health checks and weighted routing

If you add health checks to all the records in a group of weighted records, but you give nonzero weights to some records and zero weights to others, health checks work the same as when all records have nonzero weights with the following exceptions:

The following table details the behavior when the 0-weight record includes a health check:

The following table details the behavior when the 0-weight record doesn't include a health check: