For VDSmanager Linux you need dedicated server with clear installation CentOS Linux.
See my last message.
For transfer data from old server you need create VPSes in the new system and move data.
Users can login to
https://main-node/manager/vdsmgr with login as primary ip-address and root user password for manage own servers (such as reboot or reinstall).
For own system users can login by ssh or other tools.