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User Mode Linux is a virtualization technology which can be used to create Linux virtual machines within a Linux host. UML gains significance over other virtualization technologies in that it is incorporated into the official Linux kernel tree. This is a review of an excellent book on User Mode Linux authored by Jeff Dike. The fact that Jeff is the creator of UML lends a lot of credibility to this well written book which pursues a niche area.
Nowadays with the advent of more powerful processors and cheaper memory, interest has been re-generated towards virtualization technologies - be it a commercial venture such as Vmware which does full virtualization or open source one which does partial virtualization such as Xen. But besides these two, there is a very interesting project called User Mode Linux (UML) which has gained prominence in the Linux arena. UML is used to create Linux virtual machines which run within a Linux computer. What makes UML stand apart from the rest of the virtualization technologies is that support for it has been incorporated into the official Linux kernel tree. So anybody who has downloaded the kernel source from the official website can easily compile his/her own UML enabled Linux kernel.
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