[metaverse]

While my app isn't resolved using DYN, we are relying on APIs on our EC2 backend that use their DNS. Is there a Linux DNS caching server that will serve from a local cache primarily, and do lookups in the background instead to update the local cache? During the period DYN was down, it would've continued severing from the local cache and retried the background lookups, keeping my app up. I can also see it improving performance as my servers currently do lookups to the EC2 DNS on each http request...

[nixgeek]

If you're in us-east-1 then you potentially do actually rely on Dyn even for the amazonaws.com instance hostnames.

https://gist.github.com/agh/4e20df0d2d3bfa189477569b77f72e24

[metaverse]

Seems then that ELB has a local cache because http requests were reaching my app servers throughout the outage.