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I've never ever come up with a scenario where RR DNS is useful in the goal of achieving high availability. I'm similarly mystified. What can be useful: dynamic
by lysace 2y ago
I've never ever come up with a scenario where RR DNS is useful in the goal of achieving high availability. I'm similarly mystified.
What can be useful: dynamically adjusting DNS responses depending on what DC is up. But at this point shouldn't you be doing something via BGP instead? (This is where my knowledge breaks down.)
- stackskipton 2y agoYea, Anycast IP like what Cloudflare does is the best. If you want cheaper load balancing and are ok with some downtime while DNS reconfigures, DNS system that returns IP based on which Datacenter is up works. Examples of this are Route53, Azure Traffic Manager and I assume Google has solution, I just don't know what it is.
- lysace 2y agoWorked on implementing a distributed-consensus driven DNS thing like 15 years ago. We had 3 DCs around the world for a very compute-intense but not very stateful service. It actually just worked without any meaningful testing on the first single DC outage. In retrospect I'm amazed.