I have a keepalived environment with 2 hosts which decide which one is master and which one is slave.
The IP is set within the container by keepalived on the host which is master at the moment.
The hosts communicate via eth1 which is configured in proxmox.
Because eth1 loads with a delay, I have a split-brain situation, where the new host can't communicate with the other host and thinks that it's the only master.