KVM : Create Virtual Machine#12018/05/15

	Install GuestOS and create a Virtual Machine. This example shows to install Fedora 28.
[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 directory

[root@dlp ~]#

mkdir -p /var/kvm/images

[root@dlp ~]#

virt-install \

--name fedora28 \
--ram 4096 \
--disk path=/var/kvm/images/fedora28.img,size=30 \
--vcpus 2 \
--os-type linux \
--os-variant fedora27 \
--network bridge=br0 \
--graphics none \
--console pty,target_type=serial \
--location 'http://ftp.jaist.ac.jp/pub/Linux/Fedora/releases/28/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 memories of Virtual Machine

--disk path=xxx ,size=xxx

[path=] specify the location of disks of Virtual Machine
[size=] specify the amount of disks 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 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]	Install on text mode, it's the same with common procedure of installation. After finishing installation, reboot first and then login prompt is shown like follwos.

Fedora 28 (Server Edition)
Kernel 4.16.3-301.fc28.x86_64 on an x86_64 (ttyS0)

Admin Console: https://10.0.0.213:9090/ or https://[fe80::5054:ff:fe9e:995a]: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 fedora28

# move to Guest

Connected to domain fedora28

Escape character is ^]

# Enter key

[root@localhost ~]#

# Guest's console

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

[root@dlp ~]#

virt-clone --original fedora28 --name template --file /var/kvm/images/template.img

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

Clone 'template' created successfully.

# disk image

[root@dlp ~]#

ll /var/kvm/images/template.img

-rw-------. 1 root root 2000158720 May 15 19:31 /var/kvm/images/template.img

# configuration file

[root@dlp ~]#

ll /etc/libvirt/qemu/template.xml

-rw-------. 1 root root 3322 May 15 19:31 /etc/libvirt/qemu/template.xml

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