The closest thing to a private AWS — Nova compute with a real filter/weigher scheduler, Neutron SDN, Cinder block, Glance images, Keystone IAM, Horizon UI, multi-tenancy and quotas done properly, scaling to thousands of nodes. And the honest other half: notorious operational complexity, thirty-plus services, and a learning curve survivable only via a deployment tool. When the power is worth the pain, and when it absolutely is not.
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OpenStack: The Full Reference Cloud (and What It Costs You) -
Proxmox SDN: Software Defined Networking A deep dive into Proxmox VE's Software Defined Networking: zones, VNets, VXLANs, EVPN with BGP peering, multi-tenant overlay networks, and building isolated network segments across a Proxmox cluster.