as root or oneadmin?

it's strange that opennebula does not create the keys automatically

From oneadmin.
For what you need keys if u have only one server?

Yes, you are right! Now I'm going to understand how to create virtual routers virtual networks and vms. After that I have to install opennebula on different servers. Thank you for all the answers

Moreover also in the case where I have only one server I have to do the step with the ssh  passwordless creating and adding the file known_hosts.. So that it works when I crate a host with the same name as in the file

How can I create an interface br0 as in the example of doc?

Solution 1: Using Distribution-Specific Scripts

Ok, thanks, I will try it

You need to install bridge-utils, than create bridge interface and edit physical interface for work over bridge.

Ok, these steps are described in the link above?

Yes. Or here more detailed.
http://www.techotopia.com/index.php/Creating_a_CentOS_KVM_Networked_Bridge_Interface

👍

Hi, thanks for your support! I have installed opennebula and I instanciated some vm... But I can't do the login with a VM downloaded from marketplace... For instance with Ubuntu 14.04 after I copied the id_rsa.pub of oneadmin in the context template when it is vrunning needs in any case an username and password... Can you please help me with this problem?

Hi. You need to use contextualization script when initiate vm.

Ok, where can I find these script? Then, my procedure with the id_rsa.pub is wrong right?

Hi Roman, sorry for the bother but I have a problem that I cannot understand. Probably you can help me in some way. Then, after I installed oned on 2 vm I tried to instantiate a ttylinux on frontend and all work great. The problem is with te second node... The vm stops in a status failure with a log about capabilities for arch x86_64 domaintype=kvm. I searched on the Web something similar and I have both vms(frontend and node 2) that support kvm... Also on the frontend it works. Can you help me please?