How to put xen virtualization and implement 4 virtual servers?

Question

System administration

Actually the task such:
It is necessary to deliver xen virtualization and to implement 4 virtual servers.
3 virtual servers work with mongo (replication).
1 virtual server in itself raises OpenVZ and each container contains an instance of node.js
actually outside of xen on the main server is nginx
Actually there were questions:
1) what is the best OS to choose to implement such a thing?
2) if we raise OpenVZ, can we run node.js inside each instance without conflicts?

Answer 1

OpenVZ + Xen seemed to have such a core, but it is futile to fence such a garden.
Better install proxmox, it makes KVM machines and OpenVZ containers out of the box.
I think your task is implemented by one OpenVZ containers and the correct delimitation of resources.
1. Proxmox (debian)
2. Yes, containers do not overlap
ps2 Looked at your previous question. Of course, if you already have a server with Xen, you can do exactly what you want, only run the fourth server in full virtualization mode and install a system with an unmodified openvz kernel on it.