VM Resize fails with ssh key error in Openstack Environment

Solution Verified - Updated -

Issue

Resizing a Nova instance using cli fails with following error:

nova resize <instance_id> <flavor_id>

 2020-05-14 21:45:10.749 9185 ERROR oslo_messaging.rpc.dispatcher ResizeError: Resize error: not able to execute ssh command: Unexpected error while running command.
2020-05-14 21:45:10.749 9185 ERROR oslo_messaging.rpc.dispatcher Command: ssh a.b.c.d mkdir -p /var/lib/nova/instances/40e6018a-9ff2-4470-943f-c8ecad925fcd
2020-05-14 21:45:10.749 9185 ERROR oslo_messaging.rpc.dispatcher Exit code: 255
2020-05-14 21:45:10.749 9185 ERROR oslo_messaging.rpc.dispatcher Stdout: u''
2020-05-14 21:45:10.749 9185 ERROR oslo_messaging.rpc.dispatcher Stderr: u'Host key verification failed.\r\n' 

Environment

  • Red Hat Openstack Platform 8

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