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To make this work just login as nova, create an ssh key copy that key over the compute and you should be fine. I would do ssh-copy-id from the nova to the other machines. 

Repeat this as needed. (compute 1 to compute 2 etc)

Remo 
> On Oct 12, 2015, at 07:00, Nasir Mahmood <nasir.mahmood at gmail.com> wrote:
> 
> Varun,
> 
> Yes,  it's key based authentication for nova user or in other words passwordless authentication based on ssh keys.. apologise for confusing lines
> 
> On 12 Oct 2015 18:20, "varun bhatnagar" <varun292006 at gmail.com <mailto:varun292006 at gmail.com>> wrote:
> Hello Nasir,
> 
> Thanks for your reply.
> When you say "enable ssh Keys authentication for nova user between compute nodes" do you mean setting some parameter in nova.conf or do you mean setting public keys so that a user can ssh without using password?
> 
> BR,
> Varun
> 
> On Mon, Oct 12, 2015 at 2:37 PM, Nasir Mahmood <nasir.mahmood at gmail.com <mailto:nasir.mahmood at gmail.com>> wrote:
> did you enable ssh Keys authentication for nova user between compute nodes?
> 
> 
> On Mon, Oct 12, 2015 at 5:25 PM, varun bhatnagar <varun292006 at gmail.com <mailto:varun292006 at gmail.com>> wrote:
> Hi,
> 
> I have OpenStack Juno with multinode setup.
> The instance storage is mounted over NFS and is shared between all the computes.
> I am trying to migrate an instance but while doing so the instance runs into ERROR state by throwing the below error message:
> 
> Failed to launch instance "test_instance": Please try again later [Error: Unexpected error while running command. Command: ssh 192.168.151.104 mkdir -p /var/lib/nova/instances/328dc46e-8a1e-44ae-8450-6619b66203cd Exit code: 255 Stdout: u'' Stderr: u'Host key verification failed.\r\n']. 
> 
> When I try to execute this command (mkdir -p /var/lib/nova/instances/328dc46e-8a1e-44ae-8450-6619b66203cd) it gets executed properly.
> 
> Can anyone please help in fixing this?
> 
> BR,
> Varun
> 
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> 
> 
> 
> -- 
> Nasir Mahmood
> 
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