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

root@dlp:~#

mkdir -p /var/kvm/images

root@dlp:~#

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 'http://ftp.jaist.ac.jp/pub/Linux/debian/dists/buster/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

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].

--name

specify the name of Virtual Machine

--ram

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

--vcpus

specify the virtual CPUs

--os-type

specify the type of GuestOS

--os-variant

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

--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 source 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:~#

# HostOS console

root@dlp:~#

virsh console debian

# switch to [debian] VM console

Connected to domain debian
Escape character is ^]

# Enter key

debian@dlp:~$

# GuestOS console

[3]	It's easy to create another VM to copy from current VM with a command below.

root@dlp:~#

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.

root@dlp:~#

ll /var/kvm/images/debian_template.img

-rw------- 1 root root 1895170048 Jul 23 19:44 /var/kvm/images/debian_template.img
root@dlp:~#

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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