Virtualization begins to materialize in the Linux kernel
Virtualization, the ability to run multiple "virtual" systems on a single host, is nearly as old as solid state computing. But it's been all the rage again in recent years, with more than a dozen large-scale Linux virtualization projects -- and while they require special custom kernels, patches, and software, the first steps toward OS-level virtualization have been implemented in the Linux kernel.
"To me, what we see now on the virtualization front is a natural evolution, rather than a revolution," says Kir Kolyshkin, project manager for OpenVZ, an open source virtualization effort supported by SWsoft. "We went from single-user to multi-user, from single task to multitasking. Now we go from single OS to multiple OSes, from single instance to multiple isolated VMs or VEs."
Virtualization has many applications, including testbeds and virtual server hosting. "The core motivation for most users is that a single machine now has more power than they can use for a single application," says Eric W. Biederman, a kernel hacker who works on system software and clusters for the high-performance supercomputing market. "Therefore it makes sense to consolidate servers on a single machine."
"Newer machines are 95% idle when used for 'typical' setups," agrees Herbert Poetzl.
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