I have two servers, server 1 and server 2, they are mirror images. Different IPs
on cloudflare what settings do I use in this scenario.
Server 1 crashes - Cloudflare switches the DNS IP to Server 2 IP until the Server 1 is back online and it switches back.
This is a paid feature called load-balancing
https://support.cloudflare.com/hc/en-us/articles/115005254367-Billing-for-Load-Balancing#12345679
it involves health-checks if a server crashes all traffic routed to available nodes