The Book of Xen: A Practical Guide for the System Administrator

The Book of Xen: A Practical Guide for the System Administrator

Chris Takemura

Language: English

Pages: 312

ISBN: 1593271867

Format: PDF / Kindle (mobi) / ePub


Xen, the open source virtualization tool, is a system administrator's dream. Xen is a free, high-performance virtual machine monitor that lets you consolidate your hardware and finally put those unused cycles to use—without sacrificing reliability, performance, or scalability.

The Book of Xen explains everything you need to know in order to use Xen effectively, including installation, networking, memory management, and virtualized storage. You'll also learn how to use Xen and standard Linux tools to take snapshot backups, perform QoS operations on network traffic, and limit over-aggressive disk users.

Authors Chris Takemura and Luke S. Crawford show you how to:

  • Provide virtual hosting for dozens of users, each with their own individual needs
  • Install and manage multiple guests, including various flavors of Linux, NetBSD, Solaris, and Windows
  • Choose the right virtual storage options for your needs
  • Migrate your systems seamlessly and create new images
  • Tune and benchmark your systems to make them as fast as possible
  • Troubleshoot Xen's most common problems like network and memory management

Expert advice is priceless when it comes to running a complicated open source virtualization technology like Xen. You'll get the advice you need in The Book of Xen.

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............................................................................................ 19 You’re Finished. Have a Cookie. .............................................................................. 21 3 P R O V I SI O N I N G D O M U S 23 A Basic DomU Configuration ................................................................................... 24 Selecting a Kernel .................................................................................................. 24

in Chapter 5, it’s important to specify a vifname for each domain if you’re doing this. In any case, we’ll leave the particulars of bandwidth monitoring up to you. A RP C A CH E P O I S ON I N G If you use the default network-bridge setup, you are vulnerable to ARP cache poisoning, just as on any layer 2 switch. The idea is that the interface counters on a layer 2 switch—such as the virtual switch used by network-bridge—watch traffic as it passes through a particular port. Every time a switch

under /dev/mapper in the format devnamep#. Make a filesystem of your preferred type on the new partitions: # mke2fs /dev/mapper/loop1p1 # mke2fs -j /dev/mapper/loop1p2 # mount /dev/mapper/loop1p2 /mnt # mount /dev/mapper/loop1p1 /mnt/boot Copy your filesystem image into /mnt, make sure valid GRUB support files are in /mnt/boot (just like a regular GRUB setup), and you are done. Wrap-Up This chapter discussed things that we’ve learned from our years of relying on Xen. Mostly, that relates to how

(sd0a, serial) root(hd0,0) kernel (hd0,a)/xen/kernels/xen.gz dom0_mem=65536 com1=115200,8n1 module (hd0,a)/xen/kernels/XEN3_DOM0 root=sd0a ro console=ttyS0 # Same as above, but using VGA console # We can use console=tty0 (Linux syntax) or console=pc (NetBSD syntax) title Xen 3.3 / NetBSD (sd0a, vga) root(hd0,0) kernel (hd0,a)/xen/kernels/xenkernel3-3.1.0nb2 dom0_mem=65536 noreboot module (hd0,a)/xen/kernels/XEN3_DOM0 root=sd0a ro console=pc # Load a regular NetBSD/i386 kernel. Can be useful if

time=14.2 ms 64 bytes from 69.12.128.195: icmp_seq=108 ttl=56 time=13.0 ms 64 bytes from 69.12.128.195: icmp_seq=109 ttl=56 time=98.0 ms 64 bytes from 69.12.128.195: icmp_seq=110 ttl=56 time=15.4 ms 64 bytes from 69.12.128.195: icmp_seq=111 ttl=56 time=14.2 ms --- 69.12.128.195 ping statistics --111 packets transmitted, 110 received, 0% packet loss, time 110197ms rtt min/avg/max/mdev = 13.081/226.999/382.360/101.826 ms At this point the domain is completely migrated. 132 C h ap te r 9

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