• You have one or more datacenters running your application
  • Your application is mapped on a well-defined hostname (ie.
  • You are using a third-party CDN (Content Delivery Network) solution to offload your traffic to your content provider
  • You need your clients traffic to be sent to your datacenter(s) as long as it/they is/are available
  • If one or more datacenters are not available you want your traffic to be dynamically and automatically offloaded to your CDN provider


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  • Use with your load balancing algorithm of choice and enable CDN offload
  • Define one geohost that will be pointed by via a DNS CNAME record
  • Create your target
  • Assign the relevant checks to the target
  • Configure the CNAME record on the primary DNS server that handles the domain

How to configure it:

  1. Register on and log on
  2. Select under which one of the available domains (,, …) you want to create your geohost. You can choose the domain you prefer, this is purely a “cosmetic” choice. Let’s choose
  3. Create your geohost: a geohost is the FQDN (Fully Qualified Domain Name) that your authoritative DNS will use as a CNAME for your application hostname (ie. Select “Round robin” as your balancing algorithm. This can be any available algorithm, CDN offload overlays on top of all available balancing algorithms
  4. Define the target: the target’s IP address is a.b.c.d
  5. Select checks to be performed on the first target
  6. Configure your authoritative DNS to use a CNAME record to have point to