Hi, I try to install openstack (to test) with packstack on a Centos 7, 32G RAM, 8 cores. kernel 4.5.7-std-3

After a while I have an error:

packstart --allinone
...
ERROR : Error appeared during Puppet run: 10.1.78.105_controller.pp
Error: Could not start Service[target]: Execution of '/usr/bin/systemctl start target' returned 1: Job for target.service failed because the control process exited with error code. See "systemctl status target.service" and "journalctl -xe" for details.

I checked systemctl status saying:

[root@scw-5a53a2 ~]# systemctl status -l target.service
● target.service - Restore LIO kernel target configuration
   Loaded: loaded (/usr/lib/systemd/system/target.service; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since dim. 2017-01-29 11:07:40 UTC; 8h ago
 Main PID: 16368 (code=exited, status=1/FAILURE)

janv. 29 11:07:40 scw-5a53a2 target[16368]: errors = RTSRoot().restore_from_file(restore_file=from_file)
janv. 29 11:07:40 scw-5a53a2 target[16368]: File "/usr/lib/python2.7/site-packages/rtslib_fb/root.py", line 68, in __init__
janv. 29 11:07:40 scw-5a53a2 target[16368]: self._create_in_cfs_ine('any')
janv. 29 11:07:40 scw-5a53a2 target[16368]: File "/usr/lib/python2.7/site-packages/rtslib_fb/node.py", line 67, in _create_in_cfs_ine
janv. 29 11:07:40 scw-5a53a2 target[16368]: % self.__class__.__name__)
janv. 29 11:07:40 scw-5a53a2 target[16368]: rtslib_fb.utils.RTSLibError: Could not create RTSRoot in configFS
janv. 29 11:07:40 scw-5a53a2 systemd[1]: target.service: main process exited, code=exited, status=1/FAILURE
janv. 29 11:07:40 scw-5a53a2 systemd[1]: Failed to start Restore LIO kernel target configuration.
janv. 29 11:07:40 scw-5a53a2 systemd[1]: Unit target.service entered failed state.
janv. 29 11:07:40 scw-5a53a2 systemd[1]: target.service failed.

Also, I checked:

mount | grep config
none on /sys/kernel/config type configfs (rw,relatime)

I remounted to get this:

configfs on /sys/kernel/config type configfs (rw,relatime)

Service "target" won't start... Is that service provided by openstack and can you please give me an explanation on how to fix ?