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"Host key verification failed" error while resizing instance [closed]

asked 2014-08-25 11:31:50 -0500

rahulrajvn gravatar image

updated 2014-08-26 09:24:46 -0500

smaffulli gravatar image

I am facing getting following error while trying to resize an instance . I have 4 compute nodes, and one controller and network each. I am able to use live-migration between the compute nodes with out any issue.

I have enable following entries in the nova


I am getting following error in /var/log/nova/compute.log at compute node while resizing .

"/usr/lib/python2.6/site-packages/nova/virt/libvirt/", line 4907, in migrate_disk_and_power_off\n    utils.execute(\'ssh\', dest, \'mkdir\', \'-p\', inst_base)\n', '  File "/usr/lib/python2.6/site-packages/nova/", line 165, in execute\n    return processutils.execute(*cmd, **kwargs)\n', '  File "/usr/lib/python2.6/site-packages/nova/openstack/common/", line 193, in execute\n    cmd=\' \'.join(cmd))\n', "ProcessExecutionError: Unexpected error while running command.\nCommand: ssh mkdir -p /var/lib/nova/instances/5d5ced81-6fb1-4028-97cd-686e450d1bab\nExit code: 255\nStdout: ''\nStderr: 'Host key verification failed.\\r\\n'\n"]
    [root@compute1 ~]#

Detailed log from compute node is in

In dashdash board I am getting following error

Error: Failed to launch instance "Test Instance 00": Please try again later [Error: Unexpected error while running command. Command: ssh mkdir -p /var/lib/nova/instances/5d5ced81-6fb1-4028-97cd-686e450d1bab Exit code: 255 Stdout: '' Stderr: 'Host key verification failed.\r\n'].

Any idea what could be causing this. when i search i am asked to set password less authentication between nodes but I don't think that is the issue here.

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Closed for the following reason the question is answered, right answer was accepted by rahulrajvn
close date 2014-08-26 12:05:52.023065


Have you tried setting passwordless authentication between nodes?

smaffulli gravatar imagesmaffulli ( 2014-08-26 09:25:21 -0500 )edit

I have tried setting passwordless authentication but no luck

rahulrajvn gravatar imagerahulrajvn ( 2014-08-26 09:59:28 -0500 )edit

It worked after I redid the passwordless authentication and rebooted the server's. Thank you Guys

rahulrajvn gravatar imagerahulrajvn ( 2014-08-26 12:05:16 -0500 )edit

Which user did you configure for passwordless authentication?

bobyakov gravatar imagebobyakov ( 2015-04-20 13:49:17 -0500 )edit

2 answers

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answered 2015-04-21 08:48:19 -0500

rahulrajvn gravatar image

Hi , This are the steps which worked for me

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Hi Rahul,

We are facing the same issue. I have a bit of doubts "how to enable passwordless authentication between nova users", where to copy "ssh-copy-id <to all="" server’s="">" and where do I need to add the configuratio and what should be the same or extention of the file. If you can kindly help us.

Aman gravatar imageAman ( 2015-05-12 03:43:04 -0500 )edit

answered 2014-08-26 03:55:03 -0500

Anand TS gravatar image

Something related to issue mentioned here?

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Thank you man..

rahulrajvn gravatar imagerahulrajvn ( 2014-08-26 12:05:38 -0500 )edit

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Asked: 2014-08-25 11:31:50 -0500

Seen: 6,474 times

Last updated: Aug 26 '14