Networking is hard

You have a new VM to build. It has three IP addresses on the same network. Naturally, you set up the name of the machine in the DNS with one of them, and have suitable application names for the others. Maybe you CNAME things as well. And you'll need a virtual NIC too.

That's why you do this:

# host myvmname
myvmname.domain has address 10.10.1.20
myvmname.domain has address 10.10.1.22
myvmname.domain has address 10.10.1.21

And why you don't provide any other names.

And why you give the VM three virtual NICs, one for each IP address. All of them on the same network.

Networking is hard.