Create a Virtual Machine#12014/12/25

	Install GuestOS and create a Virtual Machine. This example shows to install Fedora 21.
[1]	Install GuestOS on text mode via network, it's OK on Console or remote connection with Putty and so on. Furthermore, Virtual Machine's images are placed at /var/lib/libvirt/images by default as a Storage Pool, but this example shows to create and use a new Storage Pool.

# create a new Storage Pool

[root@dlp ~]#

mkdir -p /var/kvm/images

[root@dlp ~]#

virt-install \

--name fedora21 \
--ram 4096 \
--disk path=/var/kvm/images/fedora21.img,size=30 \
--vcpus 2 \
--os-type linux \
--os-variant fedora21 \
--network bridge=br0 \
--graphics none \
--console pty,target_type=serial \
--location 'http://ftp.riken.jp/Linux/fedora/releases/21/Server/x86_64/os/' \
--extra-args 'console=ttyS0,115200n8 serial'

Starting install...

# start installation

The example of options above means like follows. There are many options for others, make sure with "man virt-install".

--name

specify the name of Virtual Machine

--ram

specify the amount of memories of Virtual Machine

--disk path=xxx ,size=xxx

'path=' ⇒ specify the location of disks of Virtual Machine
'size=' ⇒ specify the amount of disks of Virtual Machine

--vcpus

specify the virtual CPUs

--os-type

specify the type of GuestOS

--os-variant

specify the kind of GuestOS

--network

specify network types of Virtual Machine

--graphics

specify the kind of graphics. if set 'none', it means nographics.

--console

specify the console type

--location

specify the 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.

Fedora release 21 (Twenty One)
Kernel 3.17.4-301.fc21.x86_64 on an x86_64 (ttyS0)

localhost login:

[3]	Move to GuestOS to HostOS with Ctrl + ] key. Move to HostOS to GuestOS with a command 'virsh console (name of virtual machine)'.

[root@localhost ~]#

# push Ctrl + ]

[root@dlp ~]#

# Host's console

[root@dlp ~]#

virsh console fedora21

# move to Guest

Connected to domain www

Escape character is ^]

# Enter key

[root@localhost ~]#

# 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.

[root@dlp ~]#

virt-clone --original fedora21 --name template --file /var/kvm/images/template.img

Allocating 'template.img'

| 20 GB 01:44

Clone 'template' created successfully.

[root@dlp ~]#

ll /var/kvm/images/template.img

# disk image

-rw------- 1 root root 32212271104 Dec 25 20:50 /var/kvm/images/template.img
[root@dlp ~]#

ll /etc/libvirt/qemu/template.xml

# xml file

-rw------- 1 root root 3068 Dec 25 20:49 /etc/libvirt/qemu/template.xml

[5]	Set basic initial configuration to GuestOS first before using it.

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