Fedora 30
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KVM : Create Virtual Machine
2019/05/09
 
Install GuestOS and create a Virtual Machine. This example shows to install Fedora 30.
[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 fedora30 \
--ram 4096 \
--disk path=/var/kvm/images/fedora30.img,size=30 \
--vcpus 2 \
--os-type linux \
--os-variant fedora29 \
--network bridge=br0 \
--graphics none \
--console pty,target_type=serial \
--location 'http://ftp.jaist.ac.jp/pub/Linux/Fedora/releases/30/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 30 (Server Edition)
Kernel 5.0.9-301.fc30.x86_64 on an x86_64 (ttyS0)

Web console: https://localhost:9090/ or https://10.0.0.254:9090/

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 fedora30
   
# move to Guest

Connected to domain fedora30
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 fedora30 --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 32217432064 May 8 00:02 /var/kvm/images/template.img
# configuration file

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

-rw-------. 1 root root 4752 May 7 23:42 /etc/libvirt/qemu/template.xml
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