UNIX and Linux System Administration Handbook, 5th Edition

24	Virtualization

Server virtualization makes it possible to run multiple operating system instances concurrently on the same physical hardware. Virtualization software parcels out CPU, memory, and I/O resources, dynamically allocating their use among several “guest” operating systems and resolving resource conflicts. From the user’s point of view, a virtual server walks and talks like a full-fledged physical server.

See Chapter 25 for more information about containers.

This decoupling of hardware from the operating system affords numerous luxuries. Virtualized servers are more flexible than their “bare metal” kin. They’re ...