[psviderski]

For the public cluster with multiple ingress (caddy) nodes you'd need a load balancer in front of them to properly handle routing and outage of any of them. You'd use the IP of the load balancer on the DNS side.

Note that a DNS A record with multiple IPs doesn't provide failover, only round robin. But you can use the Cloudflare DNS proxy feature as a poor man's LB. Just add 2+ proxied A records (orange cloud) pointing to different machines. If one goes down with a 52x error, Cloudflare automatically fails over to the healthy one.

[snthpy]

I looked into this yesterday for making Caddy HA on my Proxmox cluster and stumbled upon keepalivd. It will provide you with a virtual IP and failover but not load balancing so you'd need to still point that at something like HAProxy for that.

Could be something interesting to integrate though.