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onto your Linux system. Download andinstall ADIOS, and you ll have a complete Fedora Coreserver that you can use for tons of other things. Every Linux computer needs two major components: a kernel and a root file system. The same is true forUML you need a UML kernel and a root file sys- tem. The root file system contains the configurationfiles, data files, and programs that run inside the VM. A UML kernel is a full Linux kernel compiled to runon Linux rather than a real CPU. When the VM needsaccess to a piece of hardware, it asks the host to dothe dirty work. The ADIOS root file system is builtfrom Fedora Core (release 1, Yarrow at the time wewrite this). It includes a version 2.4 kernel and abasic set of Fedora RPM packages. ADIOS offerssome nice features that make it stand apart fromother UML packages: A minimal set of packages is already installed. Each ADIOS root file system comes with a mini- mal set of RPM packages (just enough to get upand running). That means that your VMs are assmall as is practical and are not bloated withsoftware that could introduce vulnerabilities. RPM is already up and running.You can use theRed Hat package manager to install new pack- ages into the virtual machine or to remove thingsyou don t need. Just start the VM, mount yourinstall media, and use the normal RPM com- mands to install new packages. ADIOS automatically configures network inter- faces. Each ADIOS VM comes with a virtualEthernet interface configured to talk to yourhost s TCP/IP network. That means that you can log into the VM from your host, transfer files, mount host drives, and even run a Webbrowser all from the safety of your VM. ADIOS can create an X desktop for you. Whenyou run startxwithin the VM, a new windowappears on your desktop. Inside that window, you see the VM s desktop. Root privileges are not required. After you veinstalled ADIOS, you can relinquish your super- user privileges. UML lets you create new VMswithout requiring superuser privileges, whichmakes your system less vulnerable to typo- related accidents. The Linux Intrusion Detection System isincluded.Two of the four ADIOS VM s includeLIDS (Linux Intrusion Detection System). LIDSprotects your VM in a number of ways, but mostimportantly, it takes away most of the privilegesfrom the superuser account. When you re run- ning under LIDS, a hacker who somehow gainssuperuser privileges cannot destroy your system. We tell you more about LIDS in Technique 58. SELinux is included. SELinux (security-enhancedLinux) is a hardened version of Linux developedby the U.S. National Security Agency. Like LIDS, SELinux closes vulnerabilities and limits thesuperuser s power. SELinux is more difficult touse than LIDS. Setting Up ADIOSNow that we ve convinced you to use ADIOS, youneed to set it up. To do so takes three steps: First, you download ADIOS, then you burn it to CD, andfinally, you install it. ADIOS makes it easy to installUML and the Fedora file system. Downloading ADIOSTo download ADIOS, open a Web browser and navi- gate to the address dc.qut.edu.au/adios/iso/uml/. Right-click uml-fedora1-1.00.isoand choose SaveLink Target As. Highlight your Desktopdirectory, click Open, and then click Save. The version specified in the name of the ISOfile is the operating system insidethe VM. Inother words, when you install this ISO discimage, you re installing Fedora Linux in theUML VM. The ADIOS package is 121 megabytes long, sowhen you download it, this would be a goodtime to get a cup of coffee, go to a meeting,
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