Ubuntu 18.04
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KVM : Create Virtual Machine#1
2018/05/17
 
Install GuestOS and create Virtual Machine. This example shows to install Ubuntu 18.04.
[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

root@dlp:~#
mkdir -p /var/kvm/images

root@dlp:~#
virt-install \
--name ubuntu1804 \
--ram 4096 \
--disk path=/var/kvm/images/ubuntu1804.img,size=30 \
--vcpus 2 \
--os-type linux \
--os-variant ubuntu17.10 \
--network bridge=br0 \
--graphics none \
--console pty,target_type=serial \
--location 'http://jp.archive.ubuntu.com/ubuntu/dists/bionic/main/installer-amd64/' \
--extra-args 'console=ttyS0,115200n8 serial'
Starting install...    
# installation starts


# after finishing installation, back to KVM host and shutdown the guest like follows

root@dlp:~#
virsh shutdown ubuntu1804

Domain template is being shutdown
# mount guest's disk and enable a service like follows

root@dlp:~#
guestmount -d ubuntu1804 -i /mnt

root@dlp:~#
ln -s /mnt/lib/systemd/system/getty@.service /mnt/etc/systemd/system/getty.target.wants/getty@ttyS0.service

root@dlp:~#
umount /mnt
# start guest again, if it's possible to connect to the guest's console, it's OK all

root@dlp:~#
virsh start ubuntu1804 --console


Ubuntu 18.04 LTS ubuntu ttyS0

ubuntu login:
 
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] Move to GuestOS to HostOS with Ctrl + ] key.
Move to HostOS to GuestOS with a command 'virsh console (name of virtual machine)'.
bionic@ubuntu:~$    
# Ctrl + ] key

root@dlp:~#    
# Host's console
# move to Guest

root@dlp:~#
virsh console ubuntu1804

Connected to domain template
Escape character is ^]    
# Enter key
bionic@ubuntu:~$    
# Guest's console
[3] It's easy to create another VM to copy from current VM with a command below.
root@dlp:~#
virt-clone --original ubuntu1804 --name ubuntu1804_org --file /var/kvm/images/ubuntu1804_org.img

Allocating 'ubuntu1804_org.img'                |  30 GB  00:05

Clone 'ubuntu1804_org' created successfully.

# disk image

root@dlp:~#
ll /var/kvm/images/ubuntu1804_org.img

-rw------- 1 root root 2611806208 May 16 20:46 /var/kvm/images/ubuntu1804_org.img
# configuration file

root@dlp:~#
ll /etc/libvirt/qemu/ubuntu1804_org.xml

-rw------- 1 root root 2853 May 16 20:46 /etc/libvirt/qemu/ubuntu1804_org.xml
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