[Users] centos or rhel 7 openvz template

[Jehan Procaccia]

Hello
is it possible to run centos 7 openvz container on centos 6.x host 
machine ?
according to
http://openvz.org/Download/template/precreated
and
http://www.montanalinux.org/openvz-centos-7-pubic-qa-os-template-released.html
there seems to exist templates,
but is it not clear to me if those templates are running fine ,
I heard about systemd potential problems with vzctl tools and  other 
potential pb from kernel 2.6 vs 3.10 ...?
https://www.mail-archive.com/devel@openvz.org/msg27884.html

I am wrong ?
is centos 6 host with centos 7 container possible ?
if not, will centos 7 with centos 7 container be safer ?

thanks .