Good morning,
We are currently using CloudFlare to host our DNS zone. Yet, we'd like to move to Amazon Route53. And we'd like to make the switch progressively. We already have some apps in production, using some CloudFlare features such as SSL or custom page rules. Hence, we'd like to check if everything is right on under-used subdomains before making the big switch. :)
Here is the process I imagine:
- Add both CloudFlare and Route53 DNS servers to my registrar domain configuration,
- Add these same servers on both CloudFlare and Route53 zones NS record,
- Move some subdomains from CloudFlare to Route53.
Yet, I'm not sure about the last step.
Let's imagine we migrate myapp.acme.com from CloudFlare to Route53. So, the A myapp record won't be present on CloudFlare anymore. How does the resolution exactly work? Depending of the website I read, I understand it differently.
My guess is that resolution would try a server listed in NS record. If it finds myapp record, then it would return the resolved address. Otherwise, it will try another NS server from the list and apply the same process. Am I correct?
On the other side, other online resources insist on the synchronization of every zones. Is it mandatory for such a continuous migration?
Thanks for your help! :)
