Showing posts with label resize. Show all posts
Showing posts with label resize. Show all posts

Tuesday, August 26, 2014

"Host key verification failed" error while resizing instance Openstack

Setting allow_resize_to_same_host=true will enable the resizing in All in one model of installation . but if we have mutiple controller and compute node's we will be getting an authentication error as following

"/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"]

This is due to a bug in nova as told in below bug report which can be solved by enabling password less authentication between the compute and controller node's nova user .

By default the nova user does not have a shell so we need to enable the shell and do steps to enable password less authentication between all the server .

Enable shell for nova user

In all the controller and compute server’s enable nova user.

sed -i "s/\/var\/lib\/nova:\/sbin\/nologin/\/var\/lib\/nova:\/bin\/bash/g" /etc/passwd

cat /etc/passwd |grep nova

nova:x:162:162:OpenStack Nova Daemons:/var/lib/nova:/bin/bash

Enable password less authentication

Between all the compute and controller nodes create password less authenticatioin for user nova.


su - nova