VM Server Failover on Different Static IP

[kidkasso]

Aloha, I have setup Proxmox 8.1.3 with an Ubuntu 22.04 mail server VM (zimbra) that has a static WAN Ip at site 1
I want to setup a replicated Mail server at Site 2 with a different static wan ip, So that if Mail server 1 goes down, Mail server 2 picks up and starts.

Problem - The Static Ip is hard coded inside the Ubuntu VM, so if site 1 fails, and site 2 starts, it won't have the correct static on it.
Questions -
1 . Is it possible to set the Ubuntu VM to pull it's ip from a linux bridge or prox nic?
2. Would setting up a HA cluster or ProxBackup server serve the purpose of failover?
3. If not then how would one go about having a failover vm with a different Static ip?

More info -
I have both sites linked with a site2site vpn so they can talk to each other on the local network,

Thanks in advanced, just getting started with Proxmox and i'm loving it so far

 

[BobhWasatch]

You could have two MX records in your DNS with site 1 having higher priority. They don't need to have the same IP.

 

[kidkasso]

You could have two MX records in your DNS with site 1 having higher priority. They don't need to have the same IP.

Thnx for your reply @BobhWasatch , I've already setup the 2nd public with a lower mx priority, and set a ptr/rdns record for the 2nd ip. However replication to the 2nd box will overwrite the static ip under /etc/networks . So if the 1st server goes down the 2nd one won't have the proper static set under the vm.

 

[BobhWasatch]

I guess I'm not clear on why it has to be an exact replica except for the IP. But if that's the requirement I'm afraid I'm out of ideas. Sorry.