I don't think Cloudflare Load Balancing can do this (yet), but Dyn can: https://dyn.com/active-failover/ https://dyn.com/active-failover/ The crucial part is C

I don't think Cloudflare Load Balancing can do this (yet), but Dyn can: https://dyn.com/active-failover/ https://dyn.com/active-failover/ The crucial part is CNAME compatibility. Most DNS services I've had experience with can only do failover between IPs.