https://users.openvz.narkive.com/QnhfHAfH/unable-to-connect-to-virtuozzo

https://support.solus.io/hc/en-us/articles/360014288000-A-new-OpenVZ-VPS-does-not-start-Can-t-open-sys-fs-cgroup-ve-101-ve-ip-allow-for-writing-No-such-file-or-directory

yum install prl-disp-*
systemctl enable prl-disp.service
systemctl start prl-disp.service
systemctl restart vz