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The second important player in the field of virtualization is KVM, which offers virtualization support in the Linux kernel itself. To use it, you ll need the kvm.ko kernel module for Linux, a CPU that has built-in virtualization support, and of course a kernel that supports KVM virtualization. (The 2.6.20 kernel is the first Linux kernel to do this.) To create virtual machines with KVM, you ll use the /dev/kvm interface, and this functionality requires a modified version of the QEMU program. QEMU was originally developed as an open source virtualization product, but it never became very successful. However, its tools are still very useful, and QEMU tools and solutions are used in both KVM and Xen environments. Currently, most operating systems are supported on a KVM virtual host, provided the operating system runs on the same processor architecture. The third major player in the Linux virtualization market is Xen, which began as a research project at the University of Cambridge (see http://www.cl.cam.ac.uk/research/ srg/netos/xen). Its core component is its hypervisor, the layer that makes it possible to create virtual machines. When used on a virtual machine host, the hypervisor replaces the normal Linux kernel, which is loaded only after the Xen hypervisor. Xen is currently one of the best virtualization platforms available on Linux, mainly because of its strong developer community, which includes hardware vendors such as Intel, HP and AMD, and software vendors such , as Novell and Red Hat. Since Ubuntu Server 7.10, Ubuntu has become a strong choice as a host virtualization platform for Xen.

Gwibber is a microblogging client for the GNOME desktop environment that you can use to access Twitter, Facebook, and other social networking sites Microblogging is a complex cultural phenomenon, but in itself consists of only two basic operations: to post content, and to read other users posts (called following, as on Twitter) It is the aggregation of millions of such operations a day that renders microblogging so interesting As the number of social network sites continues to grow, it is hard for users to keep up the pace We want our posts to have the greatest impact, so we need to send it to every single microblogging site available, just to make sure no one misses it On the other hand, we want to receive the most relevant content, no matter where it was originally posted We can t stick to a single service, we must use them all.

Without tools that help us with these tasks, to fulfill that simple objective we would have to update every site manually, using a web browser, and then check them one by one to see if there is some interesting stuff We would rarely have time to do this Someone once said: I will work 24 hours a day, and nights too That sentiment also seems to apply to social networking Here s where Gwibber comes in It allows you to post to multiple sites at the same time, and follow content from different sources Whereas the MeMenu can post short messages to some microblogging sites, Gwibber lets you also read other people s threads Gwibber is installed by default and can be found at Applications Internet as Gwibber Social Client If for some reason you don t have it, you can install it by going to Applications Ubuntu Software Center.

Both Xen and KVM offer two approaches to virtualization: full virtualization and paravirtualization. Before starting to build a virtualization solution, you should understand the differences between the two.

Click Get Free Software in the left pane and select the category Internet Browse the list of available applications and select Gwibber Click Install to begin installation (refer to 20 for further information on how to install or remove software) The basic interface, as shown in Figure 15-2, is quite simple..

Listing 11-14. Finding Dan s Information Regardless of the Case in the Database Table SELECT * FROM Member WHERE UPPER(FirstName) = 'DAN'

Figure 15-2. Gwibber lets you configure multiple social networking sites. At the top is a menu that contains only three entries: Gwibber, Edit, and Help. The main section is divided into two panes: the Streams pane, where you can see your mailboxes, and the Details pane, where the selected mailbox actual posts are shown.

Paravirtualization requires a modified version of the guest operating system, and this modified version generates instructions that are easier to handle for the hypervisor, which is the

At the bottom, the Broadcast text box is shown, along with icons representing each of your microblogging accounts. You can enter your thoughts into this text box, and when you press the Enter key they will be automatically posted online. You can select which sites to post the message to by enabling or disabling the icons in the Send with: area. If the microblogging sites have a restriction for post s length, the number of remaining characters available will be displayed at the right inside the text box. Very handy! Gwibber supports many social networking sites, as listed in Table 15-1, but for Gwibber to work with them you must first have an account created for that site, and in some cases you must explicitly allow Gwibber to access your information. Table 15-1. Services Supported by Gwibber