I agree with zhangjl, It seems that there is something wrong with your ssh keys, as you can see from the logs:
Command: ssh 10.35.104.17 mkdir -p /var/lib/nova/instances/3b7ef5ae-94f4-44a8-a028-104e35cc9505 Exit code: 255 Stdout: '' Stderr: 'Host key verification failed.\r\n' Also, with this bug resolved https://bugs.launchpad.net/nova/+bug/1233184, the migrating instance will not be set to an ERROR state, on failed migration. ** Changed in: nova Status: New => Invalid -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to OpenStack Compute (nova). https://bugs.launchpad.net/bugs/1254450 Title: nova migrate fails Status in OpenStack Compute (Nova): Invalid Bug description: The nova migration fails while the instance: - Has volume attached. - The instance is active/ shutdown. - The instance just been created with no volume attached. The main nova compute node has ssh access to the secondary node, the Selinux and iptables are not a factor in the failure of the action. the version is: openstack-nova-compute-2013.2-5.el6ost.noarch openstack-nova-scheduler-2013.2-5.el6ost.noarch python-novaclient-2.15.0-1.el6ost.noarch python-nova-2013.2-5.el6ost.noarch openstack-nova-api-2013.2-5.el6ost.noarch openstack-nova-conductor-2013.2-5.el6ost.noarch openstack-nova-novncproxy-2013.2-5.el6ost.noarch openstack-nova-cert-2013.2-5.el6ost.noarch openstack-nova-common-2013.2-5.el6ost.noarch openstack-nova-console-2013.2-5.el6ost.noarch The OS is: Red Hat Enterprise Linux Server release 6.5 How reproducible: everytime Steps to Reproduce: 1. create an instance 2. migrate the instance (either when the instance is active or shutdown). 3. Actual results: the instance is in error state Expected results: the instance should move to the other nova-compute node and should be available. The nova compute logs are attached. To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/1254450/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : yahoo-eng-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp