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Figure 18-10. The MyCentOS and MyCentOS-1 guests running
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After experimenting with Xen, you should shut down NFS and then remove your CentOS installation DVD from the drive (you don t have to do so if you copied the contents on your hard drive): 1. Stop the NFS server using service nfs stop.
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CHAPTER 18 LINUX VIRTUALIZATION
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Open the exports file in /etc and comment or remove the entry /media/CentOS_5.2_Final And save it. *(ro,sync)
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Eject the DVD from the drive.
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In this chapter, we have covered several types of virtualization technologies, but we covered paravirtualization in more depth because of Xen. You have learned the roles of the Xen hypervisor and guests in running virtualization in CentOS. You also saw how to manage paravirtualized Xen guests, including starting a guest, stopping a guest, and cloning a guest. And last, we also covered how to connect to a running guest using multiple methods to administer them. In the next chapter, you will learn the techniques to use when things go wrong on your Linux system.
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CHAPTER 18 LINUX VIRTUALIZATION
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C H A P T E R 19
Linux Troubleshooting
In previous chapters, you learned how to install and configure CentOS. You also learned how to use the shell prompt to issue commands and change server-configuration files present on the system. At this point, you have a good starting point in your Linux administration career with CentOS. The last lesson that you must learn is how to handle basic troubleshooting of your Linux system. Linux and its installed software are stable, but you will face times when you might have changed a file or two that makes your system unable to boot as expected. Or, some hard drive partition failure occurred that you want to take a closer look at, which is impossible for a non-bootable Linux system. You will need to use CentOS s rescue mode to rip open your non-booting system and investigate the cause of the problem.
The CentOS Rescue Environment
Redhat-based systems such as CentOS and Fedora contain a rescue environment that you find in any of several locations: on the first installation CD or the DVD installer; on a USB flash drive containing the correct installer; or on the RHEL CD. The rescue environment includes a special kernel designed to run on minimal available memory. The environment also includes tools such as text editors and some shell utilities that can help you fix problems on your system. To run in the rescue environment, you must set your motherboard s BIOS media boot sequence to launch your booting sequence from an optical drive of your choice or from a USB port. You need to consult your motherboard s documentation for information on how to enter the BIOS and change attributes. After you change the boot sequence of your BIOS so it launches the rescue environment, insert the first CD or the DVD of CentOS into the optical drive. Let the hardware boot; once the optical drive detects the inserted CentOS installation disc, you will see a start up screen similar to the one in Figure 19-1.
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CHAPTER 19 LINUX TROUBLESHOOTING
Figure 19-1. The install start up screen of CentOS This is the same screen that you saw when you began to install CentOS in 1. Instead of pressing enter to start installing a new system, type this line at the boot: prompt to launch the rescue environment: linux rescue. Pressing enter now instructs the CentOS installer to boot the rescue environment. You will be presented with a series of questions that cover how you want the rescue environment to behave, such as what language to choose, what keyboard type to use, whether to enable networking, and whether to attempt to mount the partitions. The controls are similar to text-based user interfaces in Linux: the tab key switches sections, the arrow keys let you navigate on the section s widgets, and the spacebar key lets you do something on the selected widget, such as push a button. You can answer the questions based on your system when it comes to what language to use and the type of keyboard you have. The defaults are fine for those. You are learning the CentOS Linux rescue environment for now, so just say no to networking. This option is useful at a later stage, such as when you need the network, and you have an available backup Linux computer to transfer files to your problem machine using a network service such as FTP or SSH. The rescue environment s final question informs you that it will try to find the available Linux partitions on the Linux installation and mount them. You have three options available: Continue, ReadOnly, and Skip (see Figure 19-2).
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