Hi, it's not sufficient to have their names resolvable. Like the error message suggests, ensure they can reach each other via ssh. I suppose the nova users are required to ssh into all other control nodes for that playbook? I don't use kolla-ansible, so I'm not really sure. Have you made sure that ssh port is open and firewall/apparmor etc. all allow ssh traffic? Zitat von Satish Patel <satish.txt@gmail.com>:

Folks,

What is wrong here, I do have the following hostname resolvable from all the nodes even if they are in the /etc/hosts file, Why is the following task saying UNREACHABLE and from where its trying to reach ?

PLAY [Refresh nova scheduler cell cache] *****************************************************************************************************************************************************

TASK [nova : Refresh cell cache in nova scheduler] ******************************************************************************************************************************************* fatal: [os2-bos-ctrl01]: UNREACHABLE! => {"changed": false, "msg": "Data could not be sent to remote host \"os2-bos-ctrl01\". Make sure this host can be reached over ssh: ", "unreachable": true} fatal: [os2-bos-ctrl02]: UNREACHABLE! => {"changed": false, "msg": "Data could not be sent to remote host \"os2-bos-ctrl02\". Make sure this host can be reached over ssh: ", "unreachable": true} fatal: [os2-bos-ctrl03]: UNREACHABLE! => {"changed": false, "msg": "Data could not be sent to remote host \"os2-bos-ctrl03\". Make sure this host can be reached over ssh: ", "unreachable": true}