Hi all,

- Here is a simple architecture for my demo deployment using KVM VMs:
1) rhevm1.ab.lab -> oVirt Engine (CentOS 7.4 x86_64)
2) rhevh1.ab.lab -> oVirt Enterprise Linux Host (CentOS 7.4 x86_64)
3) rhevh2.ab.lab ->  oVirt Enterprise Linux Host (CentOS 7.4 x86_64)

- How to reproduce issue:
1) I installed 'ovirt-engine' successfully.

2) I tried to add 'rhevh1.ab.lab' from 'rhevm1.ab.lab' using SSH public key.

    Everything was OK until I had the following error message:
    "Host rhevh1 installation failed. Failed to execute Ansible host-deploy
role. Please check logs for more details:
/var/log/ovirt-engine/host-deploy/ovirt-host-deploy-ansible-20171229144439-rhevh1.ab.lab-13b2b5c4.log."

    Checking log file showed the following:
    [root@rhevm1 tmp]# cat
/var/log/ovirt-engine/host-deploy/ovirt-host-deploy-ansible-20171229144439-rhevh1.ab.lab-13b2b5c4.log
    2017-12-29 14:44:40,320 p=9666 u=ovirt |  [DEPRECATION WARNING]: The
use of 'include' for tasks has been deprecated. Use
    ' import_tasks' for static inclusions or 'include_tasks' for dynamic
inclusions.
    This feature will be removed in a future release. Deprecation warnings
can be
    disabled by setting deprecation_warnings=False in ansible.cfg.
    2017-12-29 14:44:40,321 p=9666 u=ovirt |  [DEPRECATION WARNING]:
include is kept for backwards compatibility but usage is
    discouraged. The module documentation details page may explain more
about this
    rationale.. This feature will be removed in a future release.
Deprecation
    warnings can be disabled by setting deprecation_warnings=False in
ansible.cfg.
    2017-12-29 14:44:40,458 p=9666 u=ovirt |  PLAY [all]
*********************************************************************
    2017-12-29 14:44:40,469 p=9666 u=ovirt |  TASK [Gathering Facts]
*********************************************************
    2017-12-29 14:44:40,801 p=9666 u=ovirt |  fatal: [rhevh1.ab.lab]:
UNREACHABLE! => {"changed": false, "msg": "Failed to connect to the host
via ssh: ssh_exchange_identification: Connection closed by remote
host\r\n", "unreachable": true}
    2017-12-29 14:44:40,802 p=9666 u=ovirt |  PLAY RECAP
*********************************************************************
    2017-12-29 14:44:40,802 p=9666 u=ovirt |  rhevh1.ab.lab              :
ok=0    changed=0    unreachable=1    failed=0

3) I tried to simulate Ansilbe role work by using simple ansible module
using 'root' user:
   [root@rhevm1 tmp]# ansible -m ping rhevhs -i /tmp/tmphosts
   The authenticity of host '192.168.150.21 (<no hostip for proxy
command>)' can't be established.
   ECDSA key fingerprint is
SHA256:fPem/Gn67v6tEbQpX/NJix/Ff7gPJsQ9Hz9SSBBc5ts.
  ECDSA key fingerprint is
MD5:12:ca:c7:84:93:50:3f:33:b5:39:e2:20:2d:13:17:43.
  Are you sure you want to continue connecting (yes/no)? yes
  192.168.150.21 | SUCCESS => {
      "changed": false,
      "ping": "pong"
  }


4) It seems that above ansible role is not able to deal with SSH
fingerprint for the first time even if I was able to collect
'rhevh1.ab.lab' fingerprint during adding host procedures.

5) I have tried to disable this feature in ansible.cfg file:
[root@rhevm1 tmp]# grep host_key_checking /etc/ansible/ansible.cfg
host_key_checking = False

6) Again the same results:
[root@rhevm1 tmp]# cat
/var/log/ovirt-engine/host-deploy/ovirt-host-deploy-ansible-20171229145907-rhevh1.ab.lab-3e8bace0.log
2017-12-29 14:59:08,005 p=10135 u=ovirt |  [DEPRECATION WARNING]: The use
of 'include' for tasks has been deprecated. Use
'import_tasks' for static inclusions or 'include_tasks' for dynamic
inclusions.
 This feature will be removed in a future release. Deprecation warnings can
be
disabled by setting deprecation_warnings=False in ansible.cfg.
2017-12-29 14:59:08,006 p=10135 u=ovirt |  [DEPRECATION WARNING]: include
is kept for backwards compatibility but usage is
 discouraged. The module documentation details page may explain more about
this
 rationale.. This feature will be removed in a future release. Deprecation
warnings can be disabled by setting deprecation_warnings=False in
ansible.cfg.
2017-12-29 14:59:08,139 p=10135 u=ovirt |  PLAY [all]
*********************************************************************
2017-12-29 14:59:08,151 p=10135 u=ovirt |  TASK [Gathering Facts]
*********************************************************
2017-12-29 14:59:08,477 p=10135 u=ovirt |  fatal: [rhevh1.ab.lab]:
UNREACHABLE! => {"changed": false, "msg": "Failed to connect to the host
via ssh: ssh_exchange_identification: Connection closed by remote
host\r\n", "unreachable": true}
2017-12-29 14:59:08,478 p=10135 u=ovirt |  PLAY RECAP
*********************************************************************
2017-12-29 14:59:08,478 p=10135 u=ovirt |  rhevh1.ab.lab              :
ok=0    changed=0    unreachable=1    failed=0


- Questions:
1) How could I resolve this issue?
2) Is this behaviors considered as a bug to be reported?

Thanks,
Ab
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