I'm trying to figure out how I can set up a disaster recovery for clients that manage their own domains. I have a web server.
For DR purposes, I want to replicate this server and when/if disaster strikes - swap my clients over with relative ease and without them manually updating their A records.
My problem is that I don't manage their domains. They point their domain's A records to my web server's IP. So rather than getting them to update their A record I'm trying to find an alternative solution.
I thought i would be able to set up a CNAME record on my end that points to an A record that I could update myself, and then ask the client to have a CNAME rather than an A record on their domain but it looks as though that is not an appropriate solution.
Right now, it seems like i should just swap out the production server for the dr server under the same IP but i would appreciate any alternatives.