Ubuntu 12.04
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Create virtual machine #1
2012/05/07
 
Install GuestOS and create Virtual Machine. This example shows to install Ubuntu 12.04.
[1] Install on text mode via network, it's OK on Console or remote connection with Putty and so on.
root@dlp:~#
mkdir -p /var/kvm/images
# create a storage pool

root@dlp:~#
virt-install \
-n www \
-r 2048 \
-f /var/kvm/images/www.img \
-s 20 \
--vcpus=2 \
--os-type linux \
--os-variant=ubuntuprecise \
--network bridge=br0 \
--nographics \
--location='http://jp.archive.ubuntu.com/ubuntu/dists/precise/main/installer-amd64/' \
--extra-args='console=tty0 console=ttyS0,115200n8 serial'
Starting install...
# installation starts
 
For options, make sure 'man virt-install', there are many options
-n specify the name of Virtual Machine
-r specify the amount of memories of Virtual Machine
-f specify the location of disks of Virtual Machine
-s specify the amount of disks of Virtual Machine
--vcpus=
specify the virtual CPUs
--os-type
specify types of GuestOS
--network=
specify network types of Virtual Machine
--nographics
nographics
--location=
specify location of installation where from
--extra-args=
specify parameters that is set in kernel

[2] Install on text mode, it's the same with common procedure of installation. After finishing installation, reboot first and then login prompt is shown like follwos.
Ubuntu 12.04 LTS temp ttyS0
www login:
# login with a user set in installation
[3] Move to GuestOS to HostOS with Ctrl + ] key.
Move to HostOS to GuestOS with a command 'virsh console (name of virtual machine)'.
pangolin@www:~$
# push Ctrl + ]

root@dlp:~#
# Host's console
root@dlp:~#
virsh console www
 
# move to Guest

Connected to domain www
Escape character is ^]
# Enter key
pangolin@www:~$
# Guest's console
[4] Because after installing GuestOS from network, it is minimum settings, so it's useful to save it as a template in order to create new virtual machines later. Please refer next topic to create a new virtual machine from template below.
root@dlp:~#
# Host's console

root@dlp:~#
virt-clone --original www --name template --file /var/kvm/images/template.img

Cloning www.img
| 20 GB 01:39
Clone 'template' created successfully.
root@dlp:~#
ll /var/kvm/images/template.img

-rwxr-xr-x 1 root root 21474836480 May 7 20:58 /var/kvm/images/template.img*
root@dlp:~#
ll /etc/libvirt/qemu/template.xml

-rw------- 1 root root 1519 May 7 20:32 /etc/libvirt/qemu/template.xml
[5]
Set basic initial config to GuestOS first before using it.
[6] Define a new Storage Pool.
root@dlp:~#
mkdir /etc/libvirt/storage/

root@dlp:~#
vi /etc/libvirt/storage/disk01.xml
# create new

<pool type='dir'>
# any name

   <name>disk01</name>
   <capacity>0</capacity>
   <allocation>0</allocation>
   <available>0</available>
   <source>
   </source>
   <target>
# specify pool directory

      <path>/var/kvm/images</path>
      <permissions>
         <mode>0700</mode>
         <owner>-1</owner>
         <group>-1</group>
      </permissions>
   </target>
</pool>

root@dlp:~#
virsh pool-define /etc/libvirt/storage/disk01.xml

Pool disk01 defined from /etc/libvirt/storage/disk01.xml
root@dlp:~#
virsh pool-start disk01

Pool disk01 started
root@dlp:~#
virsh pool-autostart disk01

Pool disk01 marked as autostarted
root@dlp:~#
virsh pool-list

Name                 State      Autostart
-----------------------------------------
disk01               active     yes

root@dlp:~#
virsh pool-info disk01

Name:           disk01
UUID:           294bd446-1544-7434-35e6-9c9b1b8ae902
State:          running
Persistent:     yes
Autostart:      yes
Capacity:       906.32 GB
Allocation:     16.42 GB
Available:      889.91 GB
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