KVM : Create Virtual Machines2020/11/03

	Install GuestOS and Create a Virtual Machine. This example shows to create VM with installing Fedora 33.
[1]	On this example, Download an ISO file of Fedora on a directory first and Install GuestOS from the ISO on the text mode. It's OK on the console or remote connection via SSH 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 fedora33 \
--ram 4096 \
--disk path=/var/kvm/images/fedora33.img,size=20 \
--vcpus 2 \
--os-type linux \
--os-variant fedora33 \
--network bridge=br0 \
--graphics none \
--console pty,target_type=serial \
--location /home/Fedora-Server-dvd-x86_64-33-1.2.iso \
--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 33 (Server Edition)
Kernel 5.8.15-301.fc33.x86_64 on an x86_64 (ttyS0)

Web console: https://localhost:9090/ or https://10.0.0.217:9090/

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 fedora33    # switch to Guest's console
Connected to domain fedora33

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 fedora33 --name template --file /var/kvm/images/template.img

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

Clone 'template' created successfully.

# disk image

[root@dlp ~]#

ll /var/kvm/images/template.img

-rw-------. 1 root root 2101411840 Nov 3 14:54 /var/kvm/images/template.img

# configuration file

[root@dlp ~]#

ll /etc/libvirt/qemu/template.xml

-rw-------. 1 root root 4931 Nov 3 14:54 /etc/libvirt/qemu/template.xml

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