By Prabhakar Chaganti
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Extra info for Xen Virtualization: A Practical Handbook
Example text
We need access to these partitions inside the qemu image so that we can export them to Xen as file backed VBDs, which Xen can access while creating the guest domain. To do this, we use the loop device to mount each partition inside the qemu image on a separate directory. We then create the configuration file for the CentOS guest domain and start it up. com). 0 into a guest domain. So far we have been creating Xen domU images from scratch. Doing this gives us a good overview of the various steps that are involved in creating a guest domain, so that we can roll our own when needed.
Root: The parameters for the device that contains the root filesystem. • vif: This defines the Virtual Ethernet Interface (VIF). By default xend will select a random MAC address that will change every time you reboot that domain. If you always want to use a specific MAC address for the domain, you can provide the mac option to the vif configuration directive. We will explore the various networking related options available in Chapter 5. This information is specified in a configuration file and is provided as a parameter to the xm command to create the domain.
We will use a different installation method for each domain, so that by the end of this chapter you will be familiar with the most common permutations involved in creating domains using Xen. We will create the following guest domains: • Ubuntu Feisty • NetBSD • CentOS • Slackware A Plan for Creating Xen Domains We will use the following strategy when creating the guest domains in this chapter: 1. Choose the storage medium for the domain—files, partitions, LVM, etc. We have exclusively used files in this chapter for ease of use.