Creating a Guest Virtual Machine

Creating a Guest Virtual Machine

This Chapter contains information on how to create a guest virtual machine using Oracle VM Server. You can create paravirtualized guests and hardware virtualized guests using a template, or using the command-line tool virt-install. The virt-install tool can be used as an interactive shell, or all parameters can be given at the same time from the command-line. You can enter multiple parameters to the virt-install tool in the format:

virt-install [options]

Appendix A, "Command-Line Tools" lists the virt-install command-line tool parameters.

You can also create guest virtual machines using Oracle VM Manager, and is the recommended method for creating guests. See the Oracle VM Manager User's Guide for information on creating guests with Oracle VM Manager.

Oracle recommends you create paravirtualized guests if possible, as the performance of a paravirtualized guest is superior to that of a hardware virtualized guest.

Before you create a guest virtual machine, you should have access to an installation tree, or a template. You may also need a host IP address, and a hostname.

1.1 Supported Guest Operating Systems

See the Oracle VM Server Release Notes for a list of the supported guest operating systems you can create.

1.2 Creating an Installation Tree

You cannot create a paravirtualized guest virtual machine from a local hard disk or CD-ROM using either the virt-install command-line tool, or Oracle VM Manager. You can, however, create an installation tree, and mount it as an NFS share. or make it available via HTTP or FTP. For example, to create mount an ISO file and make it available via NFS:

# mkdir -p /el/EL5-x86# mount -o ro,loop /path/to/Enterprise-R5-x86-dvd.iso /el/EL5-x86# exportfs *:/el/EL5-x86/

When you create the guest virtual machine, enter the installation location as:

nfs:example.com:/el/EL5-x86

Similarly, to set up an installation tree that can be accessed via HTTP on a computer named example.com, enter

# cd /var/www/html# mkdir EL5-x86# mount -o ro,loop /path/to/Enterprise-R5-x86-dvd.iso EL5-x86

When you create the guest virtual machine, enter the installation location as:

Note:

If you have multiple ISO files (CDs), you can mount each ISO file (CD) and copy the contents into a single directory. All the ISO files are then available from the same location.

1.3 Creating a Guest Using a Template

You can create a guest using a template. You can also register a template in Oracle VM Manager and use it to create guests. A template is compressed as a.tgz file. A template must contain the basic guest configuration files, vm.cfg and system.img. Templates are often hosted on an FTP or HTTP server. The following example shows you how to download an Oracle Linux template from an HTTP server, and use it to create a guest.

To create a guest virtual machine from a template:

1. Log in to the Oracle VM Server as the root user.
2. Download the Oracle VM template .zip file to an Oracle VM Server and place it in the /OVS/seed_pool directory.
3. Use the unzip tool to uncompress the file.
4. Extract the .tgz file. This step creates a directory with the name of the template. This directory contains the files for the template. For example:

# /OVS/seed_pool/OVM_
|

         |- System.img               (operating system image file)
|- extra.img                (optional additional image file(s))

         |- README

         |- vm.cfg                   (virtual machine configuration file)

1. Change directory to where the virtual machine files are located
2. Run the following commands to generate a new MAC address:

# cd /OVS/seed_pool/OVM_template_name

# export PYTHONPATH=/opt/ovs-agent-2.3; python -c "from OVSCommons import randomMAC; print randomMAC()"

11.Edit the vm.cfg file and change the line starting with vif to:

vif = [ 'mac=00:16:3E:xx:xx:xx', ] # for PVM
 
or
 

vif = [ 'type=netfront, mac=00:16:3E:xx:xx:xx', ] # for PVHVM

Where 00:16:3E:xx:xx:xx is the MAC address generated in above steps

13.Create and start up the guest virtual machine from the Oracle VM Server command line:

 # xm create vm.cfg

15.Connect to the guest virtual machine's console using VNC:

1. Find out the VNC port number by running the following:

# xm list -l OVM_template_name | grep location

This displays the port number assigned to the guest virtual machine's VNC console. There may be more than one line, but there should be a line that looks similar to:

(location 0.0.0.0:5901)

Use the port number (5901 in this example) when connecting to the guest virtual machine using VNC Viewer.

1. Connect to the guest virtual machine using any VNC Viewer from another computer. For example, on Oracle Linux, use the command:

# vncviewer hostname:vnc_port

Where hostname is the IP address or host name of the Oracle VM Server, and vnc_port is the port number found out in a.

1. Complete any guest virtual machine configuration required by the template.

The guest is created and started.

4.4 Creating a Guest Using virt-install

The following example shows how to create a paravirtualized or hardware virtualized guest using the virt-install command-line tool. This procedure uses an interactive session. You can also pass virt-install parameters at the same time as command-line options. In particular, kickstart options can be passed with:

virt-install -x ks=options

To create a paravirtualized or hardware virtualized guest interactively:

1. Open a command-line shell as root, and start the interactive install process by running the virt-install command-line tool:
2. If the host is capable of creating a hardware virtualized guest, the following question is displayed:

# virt-install

Would you like a fully virtualized guest (yes or no)?

Creating a hardware (fully) virtualized guest enables you to run unmodified operating systems, such as Microsoft Windows. Enter no to create a paravirtualized guest, or enter yes to create a hardware virtualized guest. Press Enter.

1. The following question is displayed:

6.  What is the name of your virtual machine?

This is the label that identifies the guest. It is used as the guest's configuration file name and stored as /etc/xen/name. This label is also used with a number of xm commands. Enter the name of the guest, for example enter

myguest

The configuration file is created. Press Enter.

1. The following question is displayed:

8.  How much RAM should be allocated (in megabytes)? Setting the RAM to a value less than 256 megabytes is not recommended.

You are prompted to enter the RAM size to be allocated to the guest. RAM is allocated solely to the guest, and not taken from dom0. To check the amount of RAM available on your computer, run the xm info command and review the free_memory column. Free memory is displayed in Megabytes. This is the total amount of RAM that can be allocated to guests. Enter the amount of RAM to be allocated for the guest in Megabytes, for example, enter

1024

Press Enter.

1. The following question is displayed:

10.  What would you like to use as the disk (path)?

The guest sees the disk storage allocated in virt-install as a single virtual hard disk, analogous to a physical hard disk. This appears as hda and can be partitioned and managed in the guest exactly as if it were regular physical hardware. Enter the absolute local path and file name of the file to serve as the disk image for the guest, for example, enter

/OVS/running_pool/myguest/System.img

This is exported as a full disk to your guest. Press Enter.

11.If the file specified in the previous step does not exist, the following question is displayed:

12.  How large would you like the disk to be (in gigabytes)?

Enter the size of the virtual disk for the guest in Gigabytes. For the purpose of this example, enter 8 Gigabytes. For example, enter

8

Press Enter.

13.The following question is displayed:

14.  Would you like to enable graphics support (yes or no)?

Graphics support determines whether a virtual graphics card is available to the guest. If you are creating a hardware virtualized guest, you should always answeryes to this question. If you are creating a paravirtualized guest, you can answer yes, or no. Press Enter.

15.The virt-install utility requests different install locations for paravirtualized and hardware virtualized guests. Paravirtualized guests can be installed from an installation tree using NFS, FTP, and HTTP. Hardware virtualized guests can be installed from an ISO file on dom0.

• If you are creating a paravirtualized guest, the following question is displayed:

What is the install location?

This is the path to an Oracle Linux installation tree, in the format used by Anaconda. NFS, FTP, and HTTP locations are supported. For example:

nfs:example.com:/path/to/tree/

[[http://example.com/path/to/tree/]]

[[ftp://example.com/path/to/tree/]

Enter the path to an installation tree, for example

[[http://example.com/EL5-x86]]

Press Enter.

• If you are creating a hardware virtualized guest, the following question is displayed:

What would you like to use for the virtual CD image?

This is the path to an ISO file on the file system on dom0. For example:

/mypath/myISO.iso

Press Enter.

Note:

NFS, FTP and HTTP locations are not supported. Do not mount the ISO file, virt-install will mount the ISO file and begin the installation from it.

The guest operating system installer starts. If you enabled graphics support in 7, a VNC window is displayed and the graphical installer is displayed. If you did not enable graphics support, a text-based installer is displayed. For example, a text-based installation of Oracle Linux displays:

Figure 4-1 Text-based Installer Screen

# pvcreate /dev/sda10

# vgcreate vg /dev/sda10

# lvcreate -L4096M -n myvmdisk1 vg

# mkfs -t ext3 /dev/vg/myvmdisk1

1. Using a file-backed Virtual Block Device**

To create a 4 Gigabyte file-backed virtual block device, enter

# dd if=/dev/zero of=vm1disk bs=1k seek=4096k count=1

Make a file system in the disk file:

# mkfs -t ext3 vm1disk

The tool requests that you confirm the creation of the file system.

Enterto confirm the creation of the file system.

4.5.2

Populating the Root File System

The root file system for the guest may be populated in a number of ways:

• Copying the root file system of dom0
• Installing an operating system

1. To copy the root file system of dom0, mount the guest root partition to /mnt:

2. # mount -t <File system type> <Guest Root Partition> /mnt

Copy the root file system from dom0 to domU:

# rsync -avH /boot /mnt

1. rsync -avH /root /mnt

[[code]]

# rsync -avH /dev /mnt

# rsync -avH /var /mnt

# rsync -avH /etc /mnt

# rsync -avH /usr /mnt

# rsync -avH /bin /mnt

# rsync -avH /sbin /mnt

# rsync -avH /lib /mnt

If your computer is a 64 bit computer, enter

# rsync -avH /lib64  /mnt

Then continue for all computers:

# rsync -avH /selinux /mnt

# mkdir /mnt/{proc,sys,home,tmp}

# chmod 777 /mnt/tmp

# unmount /mnt

1. Install an operating system. This may be done a number of ways.

• Install an Oracle VM Server-enabled operating system from CD-ROMs.
• Install an Oracle VM Server-enabled operating system from a network drive, or PXE (Preboot Execution Environment) install.

After you create the root file system for the guest, modify the guest configuration files to reflect its configuration. For example, update /etc/hosts, /etc/fstab and any network configuration files.

4.5.3 Configuring the Guest

Modify the following guest configuration files to configure the guest:

1. Edit /mnt/etc/fstab to reflect the mounted file system in the guest.

2.  /dev/sda1 / ext3 defaults 1 1

3.  none /dev/pts devpts gid=5,mode=620 0 0

4.  none /dev/shm tmpfs defaults 0 0

5.  none /proc proc defaults 0 0

6.  none /sys sysfs defaults 0 0

/dev/hda1 is the root of domU as set up in the configuration file.

1. Edit /mnt/etc/sysconfig/network to include a valid host name.

GATEWAY is the same value as dom0.

Hostname is the name of the virtual machine, for example, mycomputer.example.com. Make sure the name you use is unique and not being used by another machine.

NETWORKING=yes

HOSTNAME=mycomputer.example.com

GATEWAY=139.185.48.1

1. Edit the /mnt/etc/hosts file to include the IP address and hostname. Make sure the IP address you use is unique and not being used by another computer.

9.  127.0.0.1 localhost.localdomain localhost

10.  139.185.48.212  mycomputer.example.com  hostname

11.Edit the /mnt/etc/sysconfig/network-scripts/ifcfg-eth0 file. Use the same MAC address as the vif. If more than one MAC address is exported to the guest operating system, you must to configure more network interfaces, for example, eth1, eth2 in dom0.

The NETMASK and BROADCAST address must match the corresponding network interface in dom0.

HWADDR is same as the MAC address vif.

IPADDR is the same as in the /mnt/etc/hosts file.

DEVICE=eth0

BOOTPROTO=static

HWADDR=00:50:56:02:ff:d3

IPADDR=10.1.1.1

NETMASK=255.255.254.0

BROADCAST=10.1.1.255

ONBOOT=yes

TYPE=Ethernet

12.Move /lib/tls to /lib/tls.disabled.

13.  # mv /mnt/lib/tls /mnt/lib/tls.disabled

14.Unmount /mnt.

15.  # unmount /mnt

16.Create the guest.

17.  # xm create -c /etc/xen/domain-config-file

18.Get the console of the guest.

19.  #xm console

//Domainname//|//DomainID//
 

The guest virtual machine is created and running.

4.6 Creating a Hardware Virtualized Guest Manually

To create a hardware virtualized guest manually:

1. Install the operating system on a disk by CD-ROM pack or network install method (PXE install).
2. Create the guest configuration file, /etc/xen/domain.cfg. This is the minimum (without advanced options) hardware virtualized guest configuration file. Modify this file to suit your configuration.

3.  #Config File for Full virtualization

4.  import os, re

5.  arch = os.uname()[4]

6.  if re.search('64', arch):

7.    arch_libdir = 'lib64'

8.  else:

9.  arch_libdir = 'lib'

10.  # Kernel for hvm domain will be hvmloader

11.  kernel="/usr/lib/xen/boot/hvmloader"

12.  builder='hvm'

13.  # Memory in MB  for HVM guest domU

14.  memory=3000

15.  # Name of domain

16.  name="hvm-dom"

17.  # No of virtual cpus

18.  vcpus=4

19.  # Mac address and corresponding bridge

20.  vif=[ 'mac=00:50:56:1e:34:b5 , bridge=xenbr0' ]

21.  # Disk in which Guest OS is installed

22.  disk=[ 'phy:/dev/cciss/c0d1,hda,w' ]

23.  # Here /dev/cciss/c0d1  is the disk onwhich OS is installed.

24.  device_model='/usr/' + arch_libdir + '/xen/bin/qemu-dm'

25.  # Enable vnc library

26.  sdl=0

27.  vnc=1

28.  # Vncviewer no is 1

29.  vncviewer=1

30.  # Password to access the vnc for this guest

31.  vncpasswd="welcome"

32.  vnclisten="0.0.0.0"

33.  ne2000=1

34.  serial='pty'

35.  # Enable USB

36.  usb=1

37.  usbdevice='mouse'

See Appendix C, "Guest Configuration" for a more configuration file examples.

38.Mount the guest root file system to /mnt to enable you to modify the configuration files.

39.Edit /mnt/etc/sysconfig/network to specify the host name.

GATEWAY is same as dom0.

Hostname is the name of the virtual machine, for example, mycomputer.example.com. Make sure the name you use is unique and not being used by another computer.

NETWORKING=yes

HOSTNAME=mycomputer.example.com

GATEWAY=10.1.1.1

40.Edit the /mnt/etc/hosts file to include the hostname and IP address. Make sure that the IP address you use is unique and not being used by another machine.

41.  127.0.0.1 localhost.localdomain localhost

42.  10.1.1.1  mycomputer.example.com  hostname

43.Edit /mnt/etc/sysconfig/network-scripts/ifcfg-eth0.

Use the same MAC address as you use for the vif. If more than one MAC address is exported to the guest operating system, you must configure more network interfaces, for example, eth1, eth2.

The NETMASK and BROADCAST address must match the corresponding network interface in dom0.

HWADDR is same as the MAC address in vif.

IPADDR is as in the /mnt/etc/hosts file.

DEVICE=eth0

BOOTPROTO=static

HWADDR=00:50:56:02:ff:d3

IPADDR=10.1.1.1

NETMASK=255.255.254.0

BROADCAST=10.1.1.255

ONBOOT=yes

TYPE=Ethernet

The /etc/fstab file does not require modification with a hardware virtualized guest. Hardware virtualized guests boot as a normal operating system. It reads the partition table as usual at boot time.

44.Unmount /mnt.

45.  # unmount /mnt

46.Create the guest.

47.  # xm create -c /etc/xen/domain-config-file

48.Use VNCViewer to display the guest.

49.  # vncviewer

//hostname_of_dom0//

50.  # password : welcome

The guest is displayed.

4.7 Converting a Hardware Virtualized Guest to a Paravirtualized Guest

You may want to convert a hardware virtualized guest to a paravirtualized guest. This example uses Oracle Enterprise Linux 4 Update 5 as it does not support a direct installation as a paravirtualized guest, and paravirtual drivers are available for this operating system. This procedure gives an example of installing Oracle Enterprise Linux as a hardware virtualized guest, then converting it to a paravirtualized guest.

To create an Oracle Enterprise Linux 4, Update 5, paravirtualized guest:

1. Copy the Oracle Enterprise-R4-U5-x86_64-dvd.iso image to the local file system of the Oracle VM Server computer
2. Create a logical volume, which will be used as the guest disk image.
3. Run the virt-install command-line tool to create a hardware virtualized machine domU, and install the Oracle Enterprise Linux operating system.

2.  # ls -l /root/Enterprise-R4-U5-x86_64-dvd.iso

3.  -rw-r--r-- 1 root root 2530611200 Aug  2 13:03 /root/Enterprise-R4-U5-x86_64-dvd.iso

4.  # lvcreate -L8G -n el4u5 VolGroup00

5.  # virt-install -n el4u5 -f /dev/VolGroup00/el4u5 -v -c /root/Enterprise-R4-U5-x86_64-dvd.iso -r 512 --vnc

If you see this error message:

main: unable to connect to host: Connection refused (111)

You must run VNCViewer to reconnect to the guest console:

# vncviewer :0

1. The Oracle Enterprise Linux install begins. From the installation choices, select the following:

Installation type: Server

Package selection: Default.

Partition layout type: Make sure the guest has a single root partition. Do not configure the virtual disk using LVM. Do not create a swap partition, or other partitions mounted at other locations such as /usr or /boot.

Firewall: Disable.

SELinux: Disable.

Network: Configure the network settings for either DHCP or a fixed IP address.

1. When the Oracle Enterprise Linux installation is complete, restart the guest. If the guest does not restart automatically, use the xm command-line tool to restart it, for example:

10.  # xm list

11.  Name    ID   Mem VCPUs      State   Time(s)

12.  Domain-0 0   944     2     r-----   5670.8

13.  # xm create el4u5

14.

15.  Using config file "/etc/xen/el4u5".

16.  Started domain el4u5

17.  # vncviewer :0

18.Take note of the guest IP address, or hostname if assigned via DHCP.

Copy the domU kernel for Oracle Enterprise Linux 4 Update 5, which can be found in the directory extra_kernels/EL4U5PV_64 on the Oracle VM Server installation CD-ROM, to the guest:

# cd extra_kernels/EL4U5PV_64/

# scp kernel-xenU-//version//.EL.x86_64.rpm 10.1.1.1:

19.Log in to the guest as root and replace the contents of the /etc/modprobe.conf file with:

20.  alias scsi_hostadapter xenblk

21.  alias eth0 xennet

22.Install the kernel-xenU RPM:

23.  # rpm -ivh kernel-xenU-//version//.EL.x86_64.rpm

24.  warning: kernel-xenU-//version//.EL.x86_64.rpm: V3 DSA signature: NOKEY, key ID b38a8516

25.  Preparing...                ########################################### [100%]

26.     1:kernel-xenU            ########################################### [100%]

27.  WARNING: No module xenblk found for kernel //version//.ELxenU, continuing anyway

28.Edit the /boot/grub/grub.conf file in the guest and change the default to point to this entry:

29.  title Enterprise Linux Enterprise Linux AS (//version//.ELxenU)

30.          root (hd0,0)

31.          kernel /boot/vmlinuz-//version//.ELxenU ro root=LABEL=/

32.          initrd /boot/initrd-//version//.ELxenU.img

33.Shut down the guest. Modify the host configuration file /etc/xen/el4u5 to an entry similar to:

34.  name = "el4u5"

35.  memory = "512"

36.  disk = [ 'phy:/dev/VolGroup00/el4u5,hda,w', ]

37.  bootloader="/usr/bin/pygrub"

38.  vcpus=1

39.  on_reboot   = 'restart'

40.  on_crash    = 'restart'

Restart the guest, using the xm command-line tool:

41.  # xm create -c el4u5

The hardware configuration is displayed.

43.Remove the configuration for the network adapter and keyboard.

44.Log in to the guest, and delete the /etc/sysconfig/hwconf file.

Shut down the guest.

45.Modify the guest configuration file /etc/xen/el4u5 to add a vif entry similar to:

46.  name = "el4u5"

47.  memory = "512"

48.  disk = [ 'phy:/dev/VolGroup00/el4u5,hda,w', ]

49.  vif = [ 'bridge=xenbr0', ]

50.  bootloader="/usr/bin/pygrub"

51.  vcpus=1

52.  on_reboot   = 'restart'

53.  on_crash    = 'restart'

54.Start the guest and log in as root. Run the command:

55.  # ifconfig eth0

Take note of the HWaddr (MAC address).

56.Replace the contents of the /etc/sysconfig/network-scripts/ifcfg-eth0 file with:

57.  TYPE=Ethernet

58.  DEVICE=eth0

59.  BOOTPROTO=dhcp

60.  ONBOOT=yes

61.  HWADDR=xx:xx:xx:xx:xx:xx

Replace xx:xx:xx:xx:xx:xx with the actual MAC address reported by the ifconfig command in the guest.

62.On the host, edit the domU configuration file /etc/xen/el4u5, and add the MAC address to the vif entry:

63.  vif = [ 'mac=xx:xx:xx:xx:xx:xx, bridge=xenbr0', ]

Replace xx:xx:xx:xx:xx:xx with the actual MAC address reported by the ifconfig command in the guest.

64.Start the guest with the xm create command, for example

65.  # xm create /etc/xen/el4u5

The guest is now ready for use.

4.8 Installing Paravirtual Drivers

For optimized performance, you can install paravirtualized drivers on hardware virtualized guests. Paravirtual drivers are optimized and improve the performance of the operating system in a guest virtual machine.

Installing Oracle Linux Release 4 Update 4 as a hardware virtualized guest may require that you install paravirtual drivers for your hardware. This section lists the steps for installing these paravirtual drivers.

To install the paravirtual drivers for Windows operating systems, see the Oracle VM Windows Paravirtual Drivers Installation Guide.

To install paravirtual drivers for Oracle Linux guest operating systems:

1. Download and install the paravirtual drivers from the Oracle Unbreakable Linux Network (ULN):

2.  [[http://linux.oracle.com/]]

Search for package name kmod-xenpv-kernel_type. For example, if you are running the hugemem kernel in the guest, install the drivers with:

# up2date kmod-xenpv-hugemem

1. Modify the /etc/modprobe.conf file to comment out existing eth0 line and add the following lines:
2. Run depmod.
3. Edit the /etc/xen/vm.cfg file to replace the vif entry to:

4.  alias scsi_hostadapter xen_vbd

5.  alias eth0 xen_vnif

8.  vif = [ '', ] # for PVM

or

vif = [ 'type=netfront, ', ] # for PVHVM

1. Shut down the domain:

10.  # xm shutdown //mydomain//

11.Start the domain:

12.  # xm create /OVS/running_pool//myguest//vm.cfg

13.When prompted by kudzu, remove the old network configuration.

14.In the newly booted guest operating system, run the following command to find the new MAC address for eth0:

15.  # ifconfig eth0

16.Edit the /etc/xen/vm.cfg file to add the new MAC address:

17.  vif = [ 'mac=xx:xx:xx:xx:xx:xx, bridge=xenbr0', ] # for HVM

or

vif = [ 'type=netfront, mac=xx:xx:xx:xx:xx:xx, bridge=xenbr0', ] # for PVHVM

18.Create or edit the /etc/sysconfig/network-scripts/ifcfg-eth0 file with the following contents:

19.  TYPE=Ethernet

20.  DEVICE=eth0

21.  BOOTPROTO=dhcp

22.  ONBOOT=yes

23.  HWADDR=xx:xx:xx:xx:xx:xx

24.Create a new initrd image. Use the kernel version for your guest operating system.

25.  # mkinitrd -f /boot/initrd-//version//.ELsmp.img //version//.ELsmp --omit-scsi-modules --with=xen-vbd --with=xen-vnif --preload xen-vbd --preload xen-vnif

26.Reboot the domain.

27.Edit the /boot/grub/grub.conf file and add the following to the end of the kernel line.

Uninstalling Oracle VM Manager

Before uninstalling Oracle VM Manager, you may want to back up Oracle VM Manager. For information on how to back up and restore Oracle VM Manager,

To uninstall Oracle VM Manager:

1. Log in to the Oracle VM Manager host as the root user.
2. Start the Oracle VM Manager installation script:

   # sh /opt/ovs-manager-2.2/bin/runInstaller.sh

At the command prompt, enter 2 to uninstall Oracle VM Manager.

• 
  Uninstalling Oracle VM Manager[[#sthref14]]
  
  > Before uninstalling Oracle VM Manager, you may want to back up Oracle VM Manager. 
  > To uninstall Oracle VM Manager:
  
  ## Start the Oracle VM Manager installation script:
  ## Log in to the Oracle VM Manager host as the root user.
  >> [[code format="oac_no_warn"]]
  
  At the command prompt, enter 2 to uninstall Oracle VM Manager.
  > > > > # sh /opt/ovs-manager-2.2/bin/runInstaller.sh
  > [[code]]
  >> [[code format="oac_no_warn"]]
  > > > Please enter the choice: [1|2|3]
  
  ## Enter y(lowercase) to confirm you want to uninstall Oracle VM Manager:
  > > > 1. Install Oracle VM Manager
  > > > 2. Uninstall Oracle VM Manager
  > > > 3. Upgrade Oracle VM Manager
  > [[code]]
  >> [[code format="oac_no_warn"]]
  
  ## The following message is displayed, which confirms that the uninstallation process has completed successfully:
  > > Are you sure you want to uninstall Oracle VM Manager ?[y|N] (Default=N):
  > [[code]]
  >> [[code format="oac_no_warn"]]
  > Oracle VM Manager was removed.Please enter the choice: [1|2|3]
  > [[code]]
  
  3. Upgrade Oracle VM Manager
  > [[code format="oac_no_warn"]]
  1. Install Oracle VM Manager
  
  2. Uninstall Oracle VM Manager
  

1. Enter y (lowercase) to confirm you want to uninstall Oracle VM Manager:

   Are you sure you want to uninstall Oracle VM Manager ?[y|N] (Default=N):

2. The following message is displayed, which confirms that the uninstallation process has completed successfully:

   Oracle VM Manager was removed