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=== Virtualization === One major difference between the Linux-VServer approach and Virtual Machines is that you do not have the virtualization part as a side-effect, so you have to do that by hand where it makes sense. For example, a Virtual Machine does not need to think about uptime, because naturally the running OS was started somewhere in the past and will not have any problem to tell the time it thinks it began running. A context can also store the time when it was created, but that will be different from the systems uptime, so in addition, there has to be some function, which adjusts the values passed from kernel to user-space depending on the context the process belongs to. This is what for Linux-VServer is known as Virtualization (actually it's more faking some values passed to and from the kernel to make the processes think that they are on a different machine). Currently modified for the purpose of Virtualization are: * System Uptime * Host and Domain Name * Machine Type and Kernel Version * Context Memory Availability * Context Disk Space
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