yeah i know, i know 
looks nice, and it works also with multiple ns7alpha…
if you want to try it on ns7alpha:
$ wget https://copr.fedoraproject.org/coprs/g/cockpit/cockpit-preview/repo/epel-7/msuchy-cockpit-preview-epel-7.repo
$ cp msuchy-cockpit-preview-epel-7.repo /etc/yum.repos.d/
$ yum install cockpit
$ config set fw_cockpit service TCPPort 9090 access public status enabled
$ signal-event firewall-adjust
$ systemctl start cockpit.socket
$ systemctl enable cockpit.socket
$ systemctl start docker
$ systemctl enable docker
https://IP:9090
ah… and changing hostname from ns webui seems to change the transient hostname and not the Static hostname…
edit: updated service key as suggested