KVM : Create Virtual Machine2019/11/18

	Install GuestOS and Create a Virtual Machine. This example shows to create VM with installing Fedora 31.
[1]	Install GuestOS on text mode, 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.(use any place you like)

# create a Storage Pool directory

[root@dlp ~]#

mkdir -p /var/kvm/images

[root@dlp ~]#

virt-install \

--name fedora31 \
--ram 4096 \
--disk path=/var/kvm/images/fedora31.img,size=30 \
--vcpus 2 \
--os-type linux \
--os-variant fedora30 \
--network bridge=br0 \
--graphics none \
--console pty,target_type=serial \
--location 'http://ftp.iij.ad.jp/pub/linux/Fedora/fedora/linux/releases/31/Server/x86_64/os/' \
--extra-args 'console=ttyS0,115200n8 serial'

Starting install...

# installation starts

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
[# osinfo-query os]

--network

specify network type 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 are set in Kernel

[2]	For installing on text mode, it's the same with common procedure of installation. After finishing installation, restart computer and then login prompt is shown like follwos.

Fedora 31 (Server Edition)
Kernel 5.3.7-301.fc31.x86_64 on an x86_64 (ttyS0)

Web console: https://localhost:9090/

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 ~]#

# Ctrl + ] key

[root@dlp ~]#

# Host's console

[root@dlp ~]#

virsh console fedora31

# switch to Guest's console

Connected to domain fedora31

Escape character is ^]

# Enter key

[root@localhost ~]#

# Guest's console

[4]	It's easy to replicate a copy VM from current VM with a command below.

[root@dlp ~]#

virt-clone --original fedora31 --name template --file /var/kvm/images/template.img

Allocating 'template.img'                                   |  30 GB  00:02

Clone 'template' created successfully.

# disk image

[root@dlp ~]#

ll /var/kvm/images/template.img

-rw-------. 1 root root 1875443712 Nov 17 19:41 /var/kvm/images/template.img

# configuration file

[root@dlp ~]#

ll /etc/libvirt/qemu/template.xml

-rw-------. 1 root root 4744 Nov 17 19:41 /etc/libvirt/qemu/template.xml

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