multi-tenancy
termcloudsecurity
One system serving several customers from shared infrastructure, with isolation enforced by software rather than by separate hardware.
It is what makes cloud economics work and what makes cloud security interesting: the boundary between two customers is code, and a defect in that code is a cross-tenant issue rather than a bug. The question worth asking of any platform is where the isolation actually lives - separate processes, separate machines, or only a customer identifier in a query, because the last one fails to a single missing filter.
Also known as: tenant isolation