Create Virtual Machine#12017/06/22

	Install GuestOS and create Virtual Machine. This example shows to install Debian.
[1]	Create a Virtual Machine on text mode via network, it's OK on Console or remote connection with Putty and so on.

root@dlp:~#

apt -y install libosinfo-bin libguestfs-tools virt-top

# create a storage pool

root@dlp:~#

mkdir -p /var/kvm/images

root@dlp:~#

virt-install \

--name template \
--ram 4096 \
--disk path=/var/kvm/images/template.img,size=30 \
--vcpus 2 \
--os-type linux \
--os-variant debian9 \
--network bridge=br0 \
--graphics none \
--console pty,target_type=serial \
--location 'http://ftp.jaist.ac.jp/pub/Linux/debian/dists/stretch/main/installer-amd64/' \
--extra-args 'console=ttyS0,115200n8 serial'

Starting install...

# installation starts

# after finishing installation, back to KVM host and shutdown the guest like follows

root@dlp:~#

virsh shutdown template

Domain template is being shutdown

# mount guest's disk and enable a service like follows

root@dlp:~#

guestmount -d template -i /mnt

root@dlp:~#

ln -s /mnt/lib/systemd/system/getty@.service /mnt/etc/systemd/system/getty.target.wants/getty@ttyS0.service

root@dlp:~#

umount /mnt

# start guest again, if it's possible to connect to the guest's console, it's OK all

root@dlp:~#

virsh start template --console

Domain template started
Connected to domain template
Escape character is ^]

Debian GNU/Linux 9 debian ttyS0

debian login:

For options, make sure [man virt-install], there are many options.

--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 - list all valid variant with the following command
# osinfo-query os

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

debian@dlp:~$

# Ctrl + ] key

root@dlp:~#

# Host's console

root@dlp:~#

virsh console template

# move to Guest

Connected to domain template
Escape character is ^]

# Enter key

debian@dlp:~$

# Guest's console

[3]	It's easy to clone a virtual machine from existing one to new like follows.

# Hosts's console

root@dlp:~#

virt-clone --original template --name debian9 --file /var/kvm/images/debian9.img

Allocating 'debian9.img'                 |  30 GB  00:15

Clone 'debian9' created successfully.

root@dlp:~#

ll /var/kvm/images/debian9.img

-rw------- 1 root root 1743912960 Jun 23 09:24 /var/kvm/images/debian9.img
root@dlp:~#

ll /etc/libvirt/qemu/debian9.xml

-rw------- 1 root root 3170 Jun 23 09:24 /etc/libvirt/qemu/debian9.xml

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