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Virtual operating systems, virtual machines

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Sit tight, Linux Users. User Mode Linux will soon have the same capabilities as Xen in the virtualization arena -- like live migration, says Jeff Dike, author of User Mode Linux. Operating out of the Linux kernel port, UML enables the port to host multiple virtual operating systems.

Speaking with, Dike described the pros and cons of virtual machines versus virtual operating systems and offers some advice on whether to opt for UML, Xen or VMware. You mentioned that User Mode Linux differs from other virtualization technologies because it's more of a virtual operating system than a virtual machine. How does a virtual operating system compare with a virtual machine?

Jeff Dike: A virtual operating system has greater contact with the host operating system. This allows interactions between guest and host, which would be difficult or impossible with a virtual machine. For example, UML has two file systems [with somewhat different properties], which allow a host directory to be mounted as a UML file system.

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In another interesting interview

In another interesting interview at

There is a new open source software legal battle brewing. It concerns Red Hat Inc., JBoss, which is now a division of Red Hat, and a relatively unknown company called FireStar Software Inc. Boston intellectual property attorney Tom Carey argues that, for now, users might be better off taking a good look at proprietary software before jumping into open source, if only until the specifics of the case become better known.

Already, there have been conspiracy theories regarding Microsoft/FireStar collusion since Microsoft was a listed partner of FireStar in the past. Is FireStar getting legal assistance from Microsoft?

Carey: There is no evidence of that, but that point is really sort of intriguing, and may pop up in the discovery phase of the litigation. The fun part of the SCO case was that that company was publicly held and had to disclose many of the things it probably did not want to disclose during the course of that trial. With this trial, that kind of information is not going to be available.

That Interview.

You talk the talk, but do you waddle the waddle?

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