Does this advice still hold true today?
I would like to upgrade from cloud compute to high frequency and keep my ip. Going from $5 to $6 a month, without paying the additional $3/month for the reserved ip.
After reserving the ip, moving it to the new instance, then destroying the old instance. Can I make it the main ip and then unreserve it?
Only the main IP of a server can be converted to an unreserved IP.
After transferring a reserved IP to the server, can I make it the main ip to unreserve it? Or is the main ip the one its created with and doesn't change?
If you add the reserved IP to a running instance, it will be a secondary IP. It's not possible to convert a secondary IP to the main IP.
If you deploy the new server with the reserved IP, it will be the main IP.