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When you run virt-install, you will be asked by a series of questions for the new guest to be created: What is the name of your virtual machine : You have to give a unique name to help Xen identify guests from one another. Use it to start this guest. How much RAM should be allocated (in megabytes) : Specify the amount of memory this guest will use when running. What would you like to use as the disk (file path) : Specify the guest s image file, which holds the guest s kernel, filesystem, and system tools. You need to give the full path here to let virt-install know where to place it. You can name the image file using the name of the guest and append the .img extension, the shorthand for image. How large would you like the disk (...) to be (in gigabytes) : In this question, the name of the image file you gave previously will replace the ellipses. Specify the size of the image file to be created for this guest in gigabytes. The file must be big enough to hold all of the operating system files your guest has. If you do not include a desktop environment during the install, you can allot 2 GB. Otherwise, allow 4 GB. Would you like to enable graphics support (yes or no): If your guest can support graphical installation, say yes here. For CentOS as a guest, saying yes will start the graphical version of the Anaconda installer.

Example 16-4 uses nothing but local variables, but ends up using the same StringBuilder object from all three threads each thread might have its own local variable to refer to that object, but all three variables refer to the same object..

Example 16-4 does something slightly unusual with the Thread constructor. Our Go method now requires two arguments the StringBuilder and the name but Thread doesn t provide a way to pass in more than one argument; we get to choose an argument count of either zero or one. So we re using a lambda here to provide a zero-argument method for Thread, and that lambda passes the two arguments into Go, including the new StringBuilder argument. It has also enabled us to declare that the Go method is expecting the name to be a string, rather than the less specific object type used in the previous example. This technique doesn t have anything to do with threading; it s just a useful trick when you find yourself confronted with an API that takes a delegate that doesn t have enough arguments. (And it s not the cause of the problem here. Less concise ways of passing the object in would have had the same problem, and so would the use of multiple methods, which Example 16-1 illustrated.) Example 16-4. Local variables, but shared state

What is the install location : Specify the location of the guest source installation files that virt-install will use to install on your guest s image file. The guest installation files can come from an NFS server, an HTTP server, or an FTP server. For an NFS server, use the format nfs://hostname/directorypath. For an HTTP server, use http://hostname/directorypath. For an FTP server, use ftp://hostname/directorypath. The hostname is the host name or IP address of the machine of the source server, and directorypath is the location of the installation files being hosted by that server. For example, if the NFS server that has the IP address of 192.168.1.102 and shares the directory /media/CentOS_5.2_Final that contains the installation source files required to make a CentOS guest, you will use nfs://192.168.1.102:/media/CentOS_5.2_Final. After you answer these questions, virt-install will create the required image file, perform the installation using the installation source, and reboot the guest in your system. The remaining examples in this chapter assume that the hardware is Xen-capable and that the computer has 1 GB of available RAM, enough disk space to store the virtual machines. This machine will have the IP address of 192.168.1.102, which will be used instead of 127.0.0.1 to help the CentOS installation find your local NFS server.

using System; using System.Threading; using System.Text; class Program { static void Main(string[] args) { StringBuilder result = new StringBuilder(); // Sharing the StringBuilder between threads. BAD! Thread t1 = new Thread(() => Go(result, "One")); Thread t2 = new Thread(() => Go(result, "Two")); t1.Start(); t2.Start(); Go(result, "Main"); t1.Join(); t2.Join(); } Console.WriteLine(result);

static void Go(StringBuilder sb, string name) {

}

We will prepare the CentOS installation DVD for use with virt-install later. 1. 2. Put the CentOS 5.2 DVD on your drive. Wait for it to mount on your desktop. Open the exports file in /etc, and add the following line: /media/CentOS_5.2_Final *(ro,sync)

}

for (int i = 0; i < 100; ++i) { // All threads using the same StringBuilder - BAD! sb.AppendFormat("{0}: {1}", name, i); sb.AppendLine(); }

By the way, you ll have noticed that this code calls Join on both Thread objects. The Join method blocks until the thread has finished this code needs to do that because it prints the output only once the threads are done. This is a simple example of coordinating operations across multiple threads. However, it s not sufficient to avoid problems here. Looking at the output, it s clear that all is not well. Here are the first few lines, running on a quad-core system:

This line allows any host to mount the remote shared directory of this NFS server, which permits the new instance of the CentOS installation to mount on the NFS server. Adding this line also avoids having to guess what IP address the installation process will get, since you re specifying it on the exports file. 3. Start the NFS server if it is not yet running by using service nfs start. If you have it running, you can use exportfs -r to reload the contents of the exports file so the new shared directories can be seen by NFS clients.

Main: One: Two: 00 Main: 1 2 MainTwo: 3 Main: 1 2 2 Two: 3One: Two: 4 Two: One: 6Two: One: 7 One: 8 : One: 9