CentOS 8
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KVM : Create Virtual Machine2019/10/08

Install GuestOS and Create a Virtual Machine. This example shows to create VM with installing CentOS 8.
[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 centos8 \
--ram 4096 \
--disk path=/var/kvm/images/centos8.img,size=30 \
--vcpus 2 \
--os-type linux \
--os-variant rhel8.0 \
--network bridge=br0 \
--graphics none \
--console pty,target_type=serial \
--location 'https://ftp.riken.jp/Linux/centos/8/BaseOS/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].
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
[# osinfo-query os]
specify network type 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 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.
CentOS Linux 8 (Core)
Kernel 4.18.0-80.7.1.el8_0.x86_64 on an x86_64

Activate the web console with: systemctl enable --now cockpit.socket

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 centos8
# switch to Guest's console

Connected to domain centos8
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 centos8 --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 Oct 7 19:41 /var/kvm/images/template.img
# configuration file

[root@dlp ~]#
ll /etc/libvirt/qemu/template.xml

-rw-------. 1 root root 4744 Oct 7 19:41 /etc/libvirt/qemu/template.xml
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