Debian 10 Buster
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KVM : Create Virtual Machine2019/07/23

Install GuestOS and create Virtual Machine. This example shows to install Debian.
[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 storage pool

mkdir -p /var/kvm/images

virt-install \
--name debian \
--ram 4096 \
--disk path=/var/kvm/images/debian.img,size=20 \
--vcpus 2 \
--os-type linux \
--os-variant debian9 \
--network bridge=br0 \
--graphics none \
--console pty,target_type=serial \
--location '' \
--extra-args 'console=ttyS0,115200n8 serial'
Starting install...    
# installation starts
# after finishing installation, back to KVM host and shutdown the guest like follows

Loading Linux 4.19.0-5-amd64 ...
Loading initial ramdisk ...

Debian GNU/Linux 10 debian ttyS0

debian login:
The example of options above means like follows. There are many options for others, make sure with [man virt-install].
specify the name of Virtual Machine
specify the amount of memory of Virtual Machine
--disk path=xxx ,size=xxx
[path=] specify the location of disks of Virtual Machine (default is [/var/lib/libvirt/images])
[size=] specify the amount of disk of Virtual Machine
specify the virtual CPUs
specify the type of GuestOS
specify the kind of GuestOS
possible to show the list of OS with follows
(if command not found, install [libosinfo-bin] package)
# osinfo-query os
specify network types of Virtual Machine
specify the kind of graphics. if set [none], it means nographics.
specify the console type
specify the location of installation source where from
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)].
# Ctrl + ] key

# HostOS console
virsh console debian
# switch to [debian] VM console

Connected to domain debian
Escape character is ^]    
# Enter key
# GuestOS console
[3] It's easy to create another VM to copy from current VM with a command below.
virt-clone --original debian --name debian_template --file /var/kvm/images/debian_template.img

Allocating 'debian_template.img'                    |  20 GB  00:03

Clone 'debian_template' created successfully.

ll /var/kvm/images/debian_template.img

-rw------- 1 root root 1895170048 Jul 23 19:44 /var/kvm/images/debian_template.img
ll /etc/libvirt/qemu/debian_template.xml

-rw------- 1 root root 4765 Jul 23 10:44 /etc/libvirt/qemu/debian_template.xml
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