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CHAPTER 18 LINUX VIRTUALIZATION
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disk: The disk directive specifies what device this virtual machine uses when it is run. The device can be a physical hard drive or an image file. In this entry, when the MyCentOS guest runs, it will use the MyCentOS.img image file, which contains its own guest kernel and filesystem located in the /var/lib/xen/images directory. That file will be known as the xvda device, and the guest will have write access on it. vif: The last directive is used to create the virtual interface to be used by the guest. Creating this interface is analogous to putting a network card on the virtual machine s hardware. The MAC (Media Access Control) address can be assigned and so acts as its bridge identifier. The values given here are specifically assigned for the MyCentOS domain. After you have created the clone later called MyCentOS-1, its configuration file remains the same except for some adjustments to differentiate it from the original. Some of the adjustments are the MAC address value inside the vif directive and the value of the uuid directive. You can change the directives by hand, but that does increase the chances of your clone not working as expected. There are other directives that you can add to customize your virtual machine, and those can be found in the xm and xmdomain.cfg man pages.
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Xen has sample configuration files for each type of guest you can create using the xm command in the /etc/xen directory. These are the xmexample1, xmexample2, xmexample.vti, and xmexample.hvm. You can browse their contents and use them as templates in manually creating virtual machines.
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Connecting to a Guest
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You can connect to a running guest in multiple ways, and we will cover the mostly used methods: using the xm command, the virt-viewer command, and the vncviewer.
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You can use the console argument of the xm command to connect to your target guest. You will have to specify either the name or numeric ID of the guest, which you can get by running xm list. After you have connected to a guest, you will be given a console that you can use to log into that guest. Assuming your MyCentOS guest is still running, open a new terminal, and use the command xm console MyCentOS. You will be given a terminal screen to connect to it similar to Figure 18-8.
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CHAPTER 18 LINUX VIRTUALIZATION
Figure 18-8. A MyCentOS console given to you after using the xm console command When you are finished with the console, you can just close the terminal window. You can use the xm console command to reconnect to that guest or connect to another one when needed.
Using virt-viewer
The virt-viewer command will display a graphical console on a running virtual machine. This is used by virt-install after rebooting to your new installed guest as shown in Figure 18-6. The virt-viewer command uses the following syntax: virt-viewer target_domain where target_domain can be the guest s name or numeric ID, which, again, you can discover in the output of the xm list command. As an exercise, close the virt-viewer window of the MyCentOS guest by clicking its close button in the upper right-hand corner. Open a new terminal, and use the command virt-viewer MyCentOS & to open a new virt-viewer window for the MyCentOS guest and allow you to run commands on the same terminal afterward.
Note: Using virt-viewer on a guest that has a running virt-viewer window on it will block the new one.
You need to close the old virt-viewer window to see the new virt-viewer window for the same guest.
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CHAPTER 18 LINUX VIRTUALIZATION
Using vncviewer
When you start a guest, Xen also starts a virtual network computing (VNC) server for it. With VNC, you can connect to that guest and have a graphical console similar when using virt-viewer. You must have vncviewer on your system before you can use vnc to connect to your guest. To install it, you use the command yum install vnc. Before you can connect to a guest, you must know two things about it: the host that the guest is running on and the port number that the guest s VNC server is listening to. To find out the port number of the guest s vnc server, you can use this command: ps ax | grep target_domain where target_domain is the domain name of the guest. If you like to know the VNC port number of the MyCentOS guest, you will use ps ax | grep MyCentOS, and it will show an output like this: 7249 Sl 0:37 /usr/lib/xen/bin/qemu-dm M xenpv d 2 domain-name MyCentOS vnc 127.0.0.1:0 -vncunused The bold part is the important entry here. You will use that bold argument for the vncviewer command, like this: vncviewer 127.0.0.1:0 After running the command, your screen will look similar to the one shown in Figure 18-9.
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