XenEnterprise

1
XenEnterprise
Presented by WS Liu (Nov 8th,2006)
2
Scheme
- Introduction to Xen and XenEnterprise -
Install XenEnterprise - Administrator
Console - Create Xen Virtual Machine - Operate
Xen Virtual Machine / XenEnterprise Server - Q
A
3
Introduction to Xen and XenEnterprise Xen and
XenEnterprise history

• The XEN VMM(virtual machine monitor) is an
  open-source project that is being developed in
  the computer laboratory of the University of
  Cambridge, UK. It enables us to create many
  virtual machines, each of which runs an instance
  of an operating system.
• In August 2005, XenSource, a commercial company
  that develops virtualization solutions based on
  Xen, announced in Intel Developer Forum (IDF)
  that it has used Intel VT-Enabled Platforms with
  Xen to virtualize both Linux and Microsoft
  Windows XP SP2.

4
Introduction to Xen and XenEnterprise Xen and
XenEnterprise history

• In August 2006, XenSource release XenEnterprise.
• Industry leading open source hypervisor
  virtualization technology. The Xen 3 hypervisor
  has the features and performance for production
  environments. Supports Intel VT, AMD
  Virtualization, 32-way SMP, PAE, and 64 bit
  addressing.
• XenEnterprise, the first commercially packaged
  and supported Xen solution, enables you to easily
  get Xen-based virtualization up and running.

5
Red Hat, Novell Spar Over Xen's ReadinessRed
Hat insists Xen still isn't ready for prime time,
which may push back the release of its Red Hat
Enterprise Linux (RHEL) 5 platform until early
2007. Novell recently disputed Red Hat's
contention that Xen isn't ready for prime time.
The Waltham, Mass., software vendor, which rolled
out its Xen-enabled SUSE Linux Enterprise 10
platform three weeks ago, claims that Red Hat is
maligning the state of Xen and is trying to
cripple its efforts on the virtualization front.
Reference news linkshttp//www.zdnet.com.au/n
ews/software/soa/Xen_leads_Novell_s_turnaround_eff
ort_in_Linux/0,130061733,139263689,00.htmhttp//
www.zdnet.com.au/news/software/soa/Xen_not_ready_f
or_prime_time_says_Red_Hat/0,130061733,139265136,0
0.htmhttp//www.infoworld.com/article/06/08/07/32
OPopenent_1.html
Introduction to Xen and XenEnterprise
6
Types of Monitor.
Introduction to Xen and XenEnterprise

• Monitor runs on a higher privilege level than the
  guest OS.
• Sensitive/Privileged instructions. (Ex MOV)
• Classified by the amount of guest OS instructions
  that are executed by monitor or by the real
  hardware.
• CSIM (Complete software Interpreter machine),
  Hybrid VM (HVM) and VMM.
• VMM Requires that Statistically dominant
  subset of the virtual processor instructions be
  executed on the real processor . (Type 1 and
  Type 2)
• Xen Type 1 VMM.
• VMWare GSX Server Type 2 VMM.

7
Introduction to Xen and XenEnterprise
Type 1 and Type 2 VMMs
Guest Process
Guest Process
Guest Operating System
Virtual Machine Monitor
Host Operating System
Hardware
Type II VMM

• Uses existing host OS abstractions to implement
  services
• Poor performance

• Runs directly on hardware
• Good performance

8
Full Virtualization and Para Virtualization
Introduction to Xen and XenEnterprise

• Full Virtualization
• No modification required for the guest OS
  (VMWares ESXServer).
• Drawbacks (especially on x86)
• Sensitive Instructions fail without traps.
• Need dynamic rewrite of OS kernel.
• Shadow system structures (performance issue to
  sync virtual and shadow structures).
• Guest OS may need both virtual and real
  resources. (Time TCP timeouts and RTT, Machine
  address for super pages etc).

9
Full Virtualization and Para Virtualization
Introduction to Xen and XenEnterprise

• Para Virtualization
• Exposed hardware is similar but not identical to
  the real machine.
• ABI not changed. (Guest apps run without
  changes).
• High performance.
• Drawback
• OS modifications is required.

10
Architecture of Xen
Introduction to Xen and XenEnterprise
11
Introduction to Xen and XenEnterprise
Xen CPU

• Xen Hypervisor runs in ring 0.
• Guest OS runs in a lower privilege level (ring
  1). Privileged and sensitive instructions are
  paravirtualized by requiring them to be validated
  and executed by hypervisor.
• Guest OS protects itself from its other
  processes by running in a separate address space
  (and separate privilege level).
• Trap/Exception handlers are registered with Xen
  for validation. (Xen checks that the code segment
  of the handlers will not run in ring 0).
• Fast Exception handlers for system calls.

12
Introduction to Xen and XenEnterprise
Xen Memory Management

• Initial Memory allocation
• Static Allocation for each domain.
• Dynamic expansion/contraction possible.
• Virtualizing memory is Complicated in x86
• x86-MMU handles TLB misses by searching through
  the page table in the hardware. (No Soft TLB
  support).
• TLB flush on context switches. (No tagged TLB
  support).

13
Introduction to Xen and XenEnterprise
Xen Memory Management

• Virtual address translation
• Page Tables Allocated and managed by guest OSes
  but restricted to read only access. Updates
  validated and applied by Xen. (via hypercalls)
• Xen Associates a type and reference count with
  each machine page frame. (PD, PT, LDT, GDT, RW).
• Xen exists in the 64 MB section on top of every
  address space (TLB flush prevented when
  entering/leaving Xen Hypervisor).
• Page fault Handling (CR2 register) Pre
  determined location.

14
Introduction to Xen and XenEnterprise
Control /Data / Timers

• Hypercalls synchronous calls from domain to
  Hypervisor. Domains do privileged operations via
  hypercalls.
• Events asynchronous notifications delivered via
  events from Xen to domains. (For delivering h/w
  interrupts).
• Data transfer through Descriptor rings. (Producer
  Consumer).
• Time and Timers Real, Virtual and wall-clock.

15
Introduction to Xen and XenEnterprise
Xen - Network

• Xen provides a Virtual Firewall-router (VFR).
• Each domain has one or more VIFs (virtual
  Interfaces) attached logically to VFR.
• VFR has rules of the form ltpatterngtltactiongt.
• Two I/O buffer descriptor rings. (Transmit and
  Receive).
• Trans Domain updates the transmit descriptor
  ring. Xen copies the descriptor and the packet
  header. Header is inspected by VFR. Payload is
  not copied (Scatter-gather). Pages are pinned
  till completion.
• Recv Xen multiplexes/firewalls using VFR and
  avoids copy by page flipping.

16
Introduction to Xen and XenEnterprise
Control and Management

• Management software runs on a special guest OS
  (domain 0).
• List of parameters to manage include access
  control (for i/o devices), amount of physical
  memory per domain, VFR rules etc.
• Mgmt software uses control interfaces provided by
  Xen.

17
Install XenEnterprise

• Before install
• This version of XenEnterprise does not support
  all of the features available in open source Xen
• Only paravirtualized operating systems are
  supported. No support is provided yet for running
  Windows on VT or AMD-V hardware.
• No support is provided yet for hosting 64-bit Xen
  VMs.
• Xen supports 32-bit processors with and without
  Physical Address Extension (PAE), 64-bit
  processors, and Symmetric Multiprocessing (SMP)
  guest operating systems.
• If your system have loopback or modem connect to
  com port,you need to remove it before install!!

18
Install XenEnterprise
System requirement
19
Install XenEnterprise

• Step 0.1
• Go XenEnterprise official web page
  http//www.xensource.com/products/xen_enterprise/
• click on download a 30 day trial and fill out
  and submit the form
• http//www.xensource.com/products/xen_enterprise/e
  val_request.html
• Step 0.2
• After register complete, you will get a mail from
  trials_at_xensource.com that contain trial download
  page link and your 30 day trial license key.

20
Install XenEnterprise

• Step 1
• Boot from XenEnterprise trial cd.
• Select Install XenEnterprise Server and choose OK
  to proceed.

21
Install XenEnterprise

• Step 2
• The next screen displays a message telling you
  that the setup program will install XenEnterprise
  on the computer, and warns that it will overwrite
  data on any hard drives that you select to use
  for the installation.
• Choose OK to proceed.
• If you have multiple local hard disks, you are
  asked to choose the Primary Disk for the
  installation. If you have multiple disks, after
  selecting the primary one, you are also prompted
  to choose if you want any of the other drives to
  be formatted for use by XenEnterprise for XenVM
  storage. (If the computer has a single hard disk,
  there is nothing to choose here.)

22
Install XenEnterprise
23
Install XenEnterprise

• Step 3.1
• Accept EULA.
• Step 3.2
• The next screen asks you to
• choose the type of keymap for
• the keyboard you are using
• (the default is QWERTY).
• Select the desired keymap and
• choose OK to proceed.

24
Install XenEnterprise

• Step 4
• The next screen asks you to choose the type of
  keyboard you are using (the default is US).
  Select the desired keyboard type and choose OK to
  proceed.

25
Install XenEnterprise

• Step 5
• The next screen asks you to specify the source of
  the installation packages. If you are installing
  off the CD, you will most likely want to select
  Local XenSource media. If you are installing via
  PXE you will most likely want to select HTTP or
  FTP or NFS, as appropriate. Make your selection
  and choose OK to proceed.

26
Install XenEnterprise

• Step 6
• The next screen asks you if you want to verify
  the integrity of the installation media.Choose
  skip verification to proceed.

27
Install XenEnterprise

• Step 7
• You are next prompted to set a root password.
  (This will be the password that the Administrator
  Console application will use to connect to the
  XenEnterprise Server.) Type the desired password
  and type it again to verify it.

28
Install XenEnterprise

• Step 8
• You are prompted to select the general
  geographical area and specific locale for Time
  Zone. Choose from the displayed list of
  geographical areas, specific locale then choose
  OK to proceed.

29
Install XenEnterprise

• Step 9
• You are prompted to choose a method of setting
  the System Time. You can select Using NTP or
  Manual time entry.
• Warning
• Currently XenEnterprise assumes that the time
  setting for the servers BIOS is the current time
  in UTC, and that the time for the XenVMs reflects
  the local time based on the time zone offset
  specified.

30
Install XenEnterprise

• Step 10
• You are prompted to set up Networking. You can
  select to configure all interfaces with DHCP, or
  specify a different network configuration, which
  prompts you to set up networking by selecting the
  NIC or NICs that are present and configuring
  their properties manually.

31
Install XenEnterprise

• Step 11
• You are next prompted to specify the
  configuration for the name service.If you select
  Specify Hostname manually, enter the desired
  hostname for the server in the field below.If you
  select Enter DNS server manually, enter the IP
  addresses of your primary (required), secondary
  (optional), and tertiary (optional) Name servers
  in the fields below.Otherwise, select OK to get a
  hostname and/or name service configuration via
  DHCP.

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Install XenEnterprise

• Step 12
• A message is displayed that the installation is
  ready to proceed and that this will format the
  selected disks and destroy any data that is
  currently on them. Select OK to proceed.
• A progress bar is displayed as the installation
  commences.
• If you chose to set the system date and time
  manually, a dialog box appears when the progress
  bar has reached about 90. Enter the correct
  numbers in the fields and select OK to proceed.

33
Install XenEnterprise

• Step 13
• When finished, a completion message is displayed.
  Select OK to reboot system. Upon reaching the
  login prompt, the system should now be ready to
  manage via the Administrator Console.You will
  need the IP address or hostname of the
  XenEnterprise Server. This is displayed at the
  login prompt.

34
Administrator Console

• Installing the Administrator Console
• The Administrator Console is a Java application
  that can be installed and run on Windows
  2000/2003/XP or Linux computers. The installer
  packages for each platform include the Java
  Runtime Environment (JRE).
• Note
• The Administrator Console uses its own private
  copy of the JRE, even if one is present on the
  machine you install it on. The installer does not
  overwrite any Java system variables like
  JAVA_HOME or CLASSPATH that may already be set.

35
Administrator Console

• To install the Administrator Console on a Windows
  computer
• Before installing the Administrator Console, be
  sure to uninstall the previous version if one
  exists.
• Put the CD in the drive.
• Browse to the /client_install directory on the CD
  and find the file named xenenterprise_client.exe.
• Double-click on the files icon to launch the
  application installer. Follow the instructions
  displayed in the installer window. When prompted
  for installation directory, either click Browse
  to change the default installation location, or
  click Next to accept the default path C\Program
  Files\XenSource.
• When complete, there will be a XenSource group on
  the All Programs list.

36
Administrator Console

• To install the Administrator Console on a Linux
  computer
• Before installing the Administrator Console, be
  sure to uninstall the previous version if one
  exists.
• Put the CD in the drive.
• Change directory to the /client_install directory
  on the CD and find the three RPMs named
• Install the following three RPMs rpm -ivh .rpm
• xenenterprise-client-3.0.0-6140.6140.i386.rpm
  (this package contains the XenSource jar files)
• xenenterprise-client-jars-3.0.0-6140.6140.i386.rpm
  (this package contains third-party jar files
  used by the product)
• xenenterprise-client-jre-3.0.0-6140.6140.i386.rpm
  (this package contains the JRE files).

37
Administrator Console

• Logging in to Administrator Console for the first
  time
• When you launch the Administrator Console for the
  first time, a dialog box appears, prompting you
  to read and accept the End User License
  Agreement. Click OK to accept the agreement.
• Next, you are prompted to enter a Master
  Password.
• The Master Password is the password for a local
  database of encrypted XenEnterprise Servers and
  XenVMs passwords that this Administrator Console
  manages. This prevents unauthorized users from
  gaining access to the XenEnterprise network that
  you deploy. It also enables you to restore the
  previous session by providing this single
  password.
• Master
  Password dialog box

38
Administrator Console

• Type the desired master password and type it
  again to confirm it, then click OK.
• Next, a dialog box appears, prompting for a
  XenEnterprise Server to connect to.
• Enter the XenEnterprise Server IP address or
  hostname and its password. Click the Remember Me
  checkbox if you want the XenEnterprise Server
  information cached locally. Click OK.
• Next, the bottom part of the Administrator
  Console displays the License Key task tab. You
  need to provide a valid License Key to be able to
  use the XenEnterprise Server you have connected
  to. The license key is provided by XenSource as a
  file.

39
Administrator Console

• To enter the License key
• Click the . . . button on the License Key dialog
  box to browse the file system and locate the
  license key file.
• Click Apply License. The License Key tab closes
  and the XenEnterprise Server becomes manageable
  from the Administrator Console.
• After License applied , your XenEnterprise server
  is ready for operate.

40
Administrator Console

• User interface elements
• The upper pane
• In the upper pane, the following information is
  displayed for the XenEnterprise Servers and
  XenVMs when they have been installed
• The name of each XenEnterprise Server and XenVM
• The Status (On, Off, Paused, Installing,
  Initializing, Stopping) of each Machine
• CPU Usage meter that displays the current CPU
  usage (for the XenEnterprise Server) or virtual
  CPU usage (for a XenVM), and number of CPUs
• Used Memory percentage meter
• Disk KB/s showing the disk I/O rate in KB per
  second and the number of disks (for the
  XenEnterprise Server) or virtual disks (for a
  XenVM)
• Network KB/s showing the network I/O rate in KB
  per second

41
Administrator Console

• Lower pane Overview tab
• The Overview tab shows the attributes and current
  configuration of the XenEnterprise Server or
  XenVM. You can change Xen VMs setting here when
  Xen VMs are shutdown.
• Lower pane Graphical Console tab
• The Graphical Console tab shows a graphical
  X-window desktop (using a VNC client) for the
  XenVM (if it is On, and if it is running a VNC
  server otherwise, an error message will be
  displayed).

42
Administrator Console

• Lower pane Text Console tab
• The Text Console tab shows text console output of
  the XenEnterprise Server or XenVM (if it is On).
• Lower pane Performance tab
• The Performance tab displays graphs of CPU usage,
  memory usage, disk rate, and network rate for the
  selected XenEnterprise Server or XenVM.

43
Administrator Console

• Lower pane History tab
• The History tab displays information about the
  tasks that have been performed on the
  XenEnterprise Server or XenVM, and error
  messages, if any.

44
Create Xen Virtual Machine

• Current version of XenEnterprise support four
  methods to install Xen VMs
• Using a XenSource Guest Template (XGT) file
• Installing from vendor media on a network
  installation server directly onto a XenVM
• Performing a physical to virtual (P2V) conversion
  on an existing physical Linux server
• Cloning an existing XenVM
• Note
• When installing XenVMs, be sure to follow the
  memory and disk space guidelines of the operating
  system and any relevant applications that you
  want to run when allocating resources such as
  memory and disk space.
• Installing a Xen VM using XGT Templates
• Select a XenEnterprise Server in the list pane,
  then select Install XenVM from the toolbar or
  menu.The tabbed area displays the Install XenVM
  dialog box.
• Click on the pulldown list to select Debian Sarge
  Guest Template.

45
Create Xen Virtual Machine

• Provide
• a name for the XenVM (this field is required)
• a description for the XenVM (this field is
  optional)
• the number of virtual CPUs you want the XenVM to
  have (the default is 1)
• the Initial Memory in MB (the default is 256 MB
  minimum is 64 MB). This will be the memory used
  by the XenVM when it is started.
• Check the Start on XenEnterprise Server Boot
  checkbox if desired. When this is checked, the
  XenVM will automatically be restarted after a
  reboot of the XenEnterprise Server. Otherwise, it
  will be need to be restarted manually.
• Provide optional Boot Parameters, if desired.
  These are standard Linux boot parameters. For
  multiple parameters, separate them in the field
  with a space. A list of values for a single
  argument should be separated with commas between
  the values, without any spaces.
• For example, you might want to specify a
  kickstart file
• gtksdeviceeth0 ksnfsmyserver.mydomain.com/tftpb
  oot/kickstart/ks_rhel41dev.cfg
• On the right side, the default Virtual Disks
  corresponding to the configuration of this
  template is displayed. Click the button (a plus
  sign icon) just below to add a virtual disk to
  the XenVM.

46
Create Xen Virtual Machine

• Similarly, Network Interfaces appear below the
  Virtual Disks.
• This section contain Name, IP Address,
  Mac Address and Network. A MAC address is
  auto-assigned by XenEnterprise using the OUI
  (Organizationally Unique Identifier) 00-16-3E,
  allocated to XenSource, Inc.
• The fourth field is the virtual network
  switch on the XenEnterprise Server that the
  virtual NIC is attached to.By default this is
  xenbr0.

47
Create Xen Virtual Machine

• When Install XenVM pane setup ok , click Install.
• When installation completes, the Status
  indicator temporarily changes to Off while the
  XenVM is started. In the History tab a Start
  XenVM message is displayed. In a moment the Off
  Status changes to Initializing..., and then On.
• Click on the Text Console tab, and log in to the
  Xen Virtual Machine.
• Note
• When the Debian Sarge XenVM starts for
  the first time, you will be prompted to set a vnc
  and root password.
• Installing an operating system from a Network
• In preparation for installing from vendor
  media, you need to make an exploded network
  repository of your vendor media (not ISO images),
  exported via NFS, HTTP or FTP accessible to the
  XenEnterprise Server.
• Note In this installation mode,only text mode is
  supported and mouse does not work.

48
Create Xen Virtual Machine

• Follow the steps described above in the section
  called Installing a XenVM using XGT Templates
  except that in the Install XenVM dialog box,
  select Red Hat Enterprise Linux 4.1 Repository
  from the pulldown.In addition, if you want to use
  a kickstart file, add the required information to
  the Boot Parameters field.
• After clicking Install, the XenVM installation
  starts, and the Text Console for the XenVM
  displays the first step of the installation
  script.
• Choose the Language to use during the
  installation process and select OK.

49
Create Xen Virtual Machine

• Select NFS Image, FTP, or HTTP from the
  Installation Method screen. Enter the IP
  configuration for the machine. Either select Use
  dynamic IP configuration (BOOTP/DHCP), or
  unselect it and edit the IP address, Netmask,
  Default gateway (IP), and Primary
  nameserver.Select OK. (It will take several
  moments for a request for DHCP configuration to
  return values and then proceed to the next
  screen.)
• Next you need to specify the HTTP, FTP, or NFS
  location of the installation media.
• For NFS image, enter the name or IP address of
  your NFS server and the directory on that server
  containing the Red Hat Enterprise Linux media.
• For FTP, enter the name or IP address of your FTP
  server and the directory on that server
  containing the Red Hat Enterprise Linux media. If
  the FTP server requires authentication, also
  select Use non-anonymous ftp, then enter the
  account name and password you wish to use on the
  next screen.
• For HTTP, enter the name or IP address of your
  Web server and the directory on that server
  containing the Red Hat Enterprise Linux media.

50
Create Xen Virtual Machine

1. The installer script will find the media and run
   Anaconda, the Red Hat installer.
2. From this point on, follow the on-screen prompts
   just as you would to install on a physical
   machine. Refer to the vendor operating system's
   installation guide for specific details.
3. After making all your selections, the vendor
   installer formats the virtual disk and then
   starts installing packages. This might take some
   time, just as with a traditional installation
   onto a physical machine.After installing all
   packages, an Installation completion message
   appears. Select Reboot to reboot the XenVM.
4. After rebooting, the XenVM comes up and presents
   the login prompt, and is ready to use.

51
Create Xen Virtual Machine

• Physical to Virtual Conversion (P2V)
• P2V is the process by which an existing
  operating system on a physical serverits
  filesystem, configuration, etc. is cast into a
  virtualized instance of the same operating system
  and filesystem,transferred, instantiated, and
  started as a XenVM on the XenEnterprise Server.
  This is accomplished by booting from the
  XenEnterprise installation CD and choosing the
  P2V option. The filesystem is copied across the
  network via ssh onto a logical volume of the
  XenEnterprise Server and will then be
  instantiated as a XenVM.
• Note
• Because Xen is a paravirtualizing hypervisor, the
  operating system kernel itself must be modified
  to run with Xen. Hence, only Linux distributions
  that are currently supported can be made into a
  template using the P2V tool. Unmodified guests on
  a XenEnterprise Server with Intel VT or AMD
  Pacifica extensions are not yet supported in
  XenEnterprise.
• XenVMs made using the P2V tool are configured
  with a root device that is allocated 150 of the
  space occupied in the root file system of the
  host it was captured from, with a minimum size of
  4GB and a maximum of 13GB. No swap device is
  automatically created for these XenVMs.

52
Create Xen Virtual Machine

• To P2V an existing server to a XenEnterprise
  Server
• Reboot the physical server that you want to
  convert and boot from the XenEnterprise
  installation CD.
• After the initial boot messages, you will see the
  "Welcome to XenEnterprise" screen. (In this and
  the screens that follow, use Tab or AltTab to
  move between elements, Space to select, and F12
  to move to the next screen.)Select OK to proceed.
• The installer does some hardware detection and
  initialization, then presents a screen with three
  choices. Select Convert existing OS on this
  machine to a XenVM (P2V) and choose OK to
  proceed.
• A "Welcome to XenEnterprise P2V" message is
  displayed next. Click OK to proceed.

53
Create Xen Virtual Machine

1. The next screen displays the installed Linux
   instances found on the local hard drive. If there
   are multiple Linux instances present, select the
   desired one. Select OK to proceed.
2. Enter a description string, if desired. Select OK
   to proceed.
3. Enter the desired volume size. Select OK to
   proceed.

54
Create Xen Virtual Machine

• You are prompted for the IP address or hostname
  of the target XenEnterprise Server. Enter it and
  click OK to proceed.
• Note
• You need manually press altF2 to setup nic ip
  address.Login as root.If you have dhcp
  server,just type ifup eth0 and see if you get ip
  from console.If there is no dhcp server,use
  ifconfig eth0 ip_address to setup ip manually.
• You can P2V OS image to a NFS server if you have
  one.You can install a P2Ved OS image from NFS
  server later.After P2V to a NFS server,mount the
  NFS path to /var/opt/xen/xgt_import.And use
  Install XenVM,you will find a new XGT
  template.Just use it to install XenVM.

55
Create Xen Virtual Machine

• Finally, you are prompted for the root password
  of the target XenEnterprise Server. Enter it and
  click OK to proceed.
• The P2V operation commences, and a progress bar
  is displayed. This process can take some time. As
  the process proceeds, the progress bar updates
  from time to time and messages like "compressing
  root filesystem...", "calculating md5 sum...",
  and "transferring root filesystem..." are
  displayed.When finished, a completion message is
  displayed.Select OK to eject the CD and reboot
  the machine.
• If you selected XenEnterprise Machine above,
  there will be a new XenVM in the upper pane of
  the Administrator Console connected to the
  XenEnterprise Server.
• Cloning an existing XenVM
• Just select a stopped XenVM and right click on
  it,select Clone.

56
Operate Xen Virtual Machine / XenEnterprise Server
XenVM commands The commands for managing
a XenVM are found in the toolbar when a XenVM is
selected in the upper pane, or the Tasks menu.
Which buttons are shown depends on the state of
the XenVM. toolbar buttons for a running XenVM
toolbar buttons for a shut down XenVM toolbar
buttons for a suspended XenVM XenEnterprise
Server commands The tools for managing
XenEnterprise Servers are found in the toolbar
when a XenEnterprise Server is selected in the
upper pane. Toolbar buttons for a XenEnterprise
Server


Extra operate command for


a running XenVM

Extra operate command for
a
XenEnterprise Server
(Right click on it)
57
Operate Xen Virtual Machine / XenEnterprise Server
XenVM configuration You can change Xen VM
setting while a Xen VM is stop.At Overview lower
pane configuration,you can change
cpu,memory,disk,and network interfaces. Note
By default, XenVMs have their clocks
synchronized to the XenEnterprise Server that
hosts them and will ignore requests to adjust the
time made by an ntp daemon if one is running. If
you want a XenVM to have an independent clock,
log on to its Text Console and issue the
command echo 1 gt /proc/sys/xen/independent_wallclo
ck then run an NTP daemon. To revert to the
default, issue the command echo 0 gt
/proc/sys/xen/independent_wallclock
58
XenEnterprise Price
XenEnterprise version3.0.0 (6140) SocketReal
system cpu sockets

• https//xensource.ltg.info/shop/productselection.a
  spx

59
Question and Answer

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