15Save Time (Free web space) By Creating a virtual workenvironment with
15Save Time By Creating a virtual workenvironment with UserMode Linux Using ADIOS to set up aFedora VM Using graphical inter- faces to your advantagein server management Making permanentchanges to your virtualmachineTechniqueBuilding a Playpenwith User ModeLinuxSometimes, you could really use a second computer someplacesafe and secure to hold a server or to try out some new software. Are you interested in trying the latest features in the Linux kernel, but you re stuck with version 2.4 for a while? User Mode Linux (UML) iswhat you re looking for. User Mode Linux is a virtual machine (VM) which is just like a regularcomputer, but it s built entirely of software. The physical computer thatcontains the VM is called the host.The host and the virtual machine canshare resources such as files, disk drives, and network interfaces. With UML, you can even simulate hardware that you don t have. If youhave a single Linux computer, you can run two or three UML sessions tosimulate a local area network. You can try out new kernels while safe- guarding your real work on a familiar kernel. You can also use UML tocreate jails for hack-vulnerable programs (such as Apache or DNSservers). A jail is an environment that confines a dangerous program bylimiting access to important files and devices that the program doesn tneed (and more importantly, shouldn t damage). In this technique, we show you how to install a UML system based on the Fedora Core distribution. This technique is one you can really buildon. After you ve installed a virtual machine, you can jump ahead toTechnique 24 to find out how to build a new kernel and try it out in a safeenvironment before you install it, or you can skip ahead to Technique 58to create a UML jail. Choosing the ADIOS Version of User Mode LinuxYou can download, compile, and install UML by hand, but we know a muchquicker way thanks to the nice folks at the Queensland University ofTechnology in Brisbane, Australia. They have put together a packagenamed ADIOS that makes it easy to install UML, loaded with a Fedora19_
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