Leandro,

I ran into this with the latest installation script. From what I could tell, 
the oVirt Manager is trying to SSH back to the Host BEFORE it copies the public 
key from the VM to the authorized_keys file on the host. For me, this was after 
the vm was built, but before it was moved to the proper ovirtmgmt network. The 
VM was using the random IP assigned by the script. 

Here is how I bypassed this error. 
 
1. During the question phase, I said "Yes" to the copy IP to /etc/hosts. 
2. I opened a 2nd SSH session to the Host. Make sure you are at root on the 2nd 
session. 
3. After the temp IP was assigned, I would SSH into the VM from the 2nd SSH 
Session. (I would normally cat /etc/hosts to see when the IP was listed there, 
but you can wait until yo see the "Wait for the host to be up" message.) You 
should be able to ssh as root the VM. 
4. I think you can copy the host public key, but I just issued a ssh-keygen -t 
ed25519, and left the password blank. 
5. I would then cat the .ssh/id_ed25519.pub file and copy the public key. 
6. exit the ssh session to the vm. 
7. copy the public key to .ssh/authorized_keys - Save and exit.

At this time, the VM should be able to ssh back to the host and verifiy that 
the "host is up." 

Hope this helps.
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