• You have at least two datacenters running the same application and both datacenters are simultaneously active (business continuity)
  • Your application is mapped on a well-defined hostname (ie.
  • On the first datacenter is running on IP a.b.c.d. One the second datacenter is running on IP x.y.z.t
  • You need your clients traffic to be sent to the geographically closest datacenter through geographical proximity


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  • Use in geographical balancing mode
  • Define one geohost that will be pointed by via a DNS CNAME record
  • Create two targets, one for each datacenter
  • Assign the relevant checks to each 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 “Proximity” as your balancing algorithm. This will enable distribution of incoming traffic towards the datacenter which is closest to the client
  4. Define the first target: the target’s IP address is a.b.c.d
  5. Select checks to be performed on the first target
  6. Define the second target: the target’s IP address is x.y.z.t
  7. Select checks to be performed on the second target
  8. Configure your authoritative DNS to use a CNAME record to have point to


“Geographical” balancing algorithm has now been renamed “Proximity”.