Descriptions and Supports

This script is used for creating a VM based on libvirtd. Your system will be checked for availability for running virtualization with the following prompts:

• Checking the compatibility system for serving virtualization
• Checking and installing the libvirtd dependency packages
• Checking the compatibility of your system with nested virtualization
• Make sure the 'workdir' directory is ready

After checking is finished, then you must fill out several questions below:

• Give a name for your VM
• How much memory
• Allocate several cores of CPU
• Select a base image and OS
• Create a primary disk for the VM
• Determine many peripheral disks for the VM
• Select a virtual network
• Specify IPv4 for the VM
• Configure a user, password, and key to access your VM
• Validate if the VM is successfully created or not

Attention please, this script currently only supports running on the Ubuntu base system. Next to do:

• Ubuntu 20 or later
• Debian
• Rhel
• CentOS
• Alpine

Prerequisites

Don't worry if you are running this script. Your system will install the following dependency packages while running this script:

1. cpu-checker
2. ipcalc
3. whois
4. qemu-system
5. libvirt-daemon-system
6. virtinst
7. libosinfo-bin

Tips and Tricks

1. If you want to running this script rootless. You must uncomment the #unix_sock_group = "libvirt" parameter in the /etc/libvirt/libvirtd.conf file

sed -i 's/^#unix_sock_group = "libvirt"/unix_sock_group = "libvirt"/g' /etc/libvirt/libvirtd.conf

2. Suppose you encounter a problem like this

The solutions is add the uri_default = "qemu:///system" parameter in the .config/libvirt/libvirt.conf file and allow all permissions to the libvirt-sock file. Here is the reference

cat << EOF > .config/libvirt/libvirt.conf
uri_default = "qemu:///system"
EOF

sudo chmod 777 /var/run/libvirt/libvirt-sock

3. Here is the example xml if you don't have a virtual network. You can customize as you wish. Click this reference

<network>
  <name>default</name>
  <bridge name='virbr0'/>
  <forward/>
  <ip address='192.168.1.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.1.2' end='192.168.1.254'/>
    </dhcp>
  </ip>
</network>

4. Allow all permissions and change owner the workdir and images directory to avoid script can't cloning base image.

• The reasons is on bellow line in script

qemu-img create -q -b "${src_dir}/${src_img}" -f qcow2 -F qcow2 "${dst_path}" "${vm_disk1_size}"G

• This is way to allow all permissions to workdir and images directory

sudo chmod -R 777 /var/lib/libvirt/workdir/

sudo chmod -R 777 /var/lib/libvirt/images/

• This is way to change owner the workdir and images directory

sudo chown -R libvirt-qemu:kvm /var/lib/libvirt/workdir/

sudo chown -R libvirt-qemu:kvm /var/lib/libvirt/images/

5. Clone this repository

git clone https://github.com/uvewexyz/create-vm-automatically.git

6. Give the execute permissions to the virtui.sh script

cd ~/create-vm-automatically

chmod +x virtui.sh && ls -l virtui.sh

7. Before running the virtui.sh script. These are recommended OS image, if you want to install. Follow bellowing step by step:

• Move the current/working directory

cd /var/lib/libvirt/workdir/

• Installing almalinux9 image

wget https://repo.almalinux.org/almalinux/9/cloud/x86_64/images/AlmaLinux-9-GenericCloud-latest.x86_64.qcow2

• Installing centos-stream9 image

wget https://cloud.centos.org/altarch/9-stream/x86_64/images/CentOS-Stream-GenericCloud-9-latest.x86_64.qcow2

• Installing alpine-virt-3.21 image

wget https://dl-cdn.alpinelinux.org/alpine/v3.21/releases/x86_64/alpine-virt-3.21.3-x86_64.iso

qemu-img convert -f raw -O qcow2 alpine-virt-3.21.3-x86_64.iso alpine-virt-3.21.3-x86_64.qcow2

• Installing ubuntu22.04 image

wget https://cloud-images.ubuntu.com/jammy/current/jammy-server-cloudimg-amd64.img

• Installing ubuntu20.04 image

wget https://cloud-images.ubuntu.com/focal/current/focal-server-cloudimg-amd64.img

• Installing, extract, and convert extension to qcow2 the openwrt image

wget https://downloads.openwrt.org/releases/24.10.1/targets/x86/generic/openwrt-24.10.1-x86-generic-generic-ext4-combined.img.gz

gunzip openwrt-24.10.1-x86-generic-generic-ext4-combined.img.gz

qemu-img convert -f raw -O qcow2 openwrt-24.10.1-x86-generic-generic-ext4-combined.img openwrt-24.10.1-x86-generic-generic-ext4-combined.qcow2

8. Run the script bellow in this way

./virtui.sh

9. Easily to create or change user password, run the command in bellow

echo "user1:Str0ngPass!" | chpasswd

10. Demonstration

Legends Color information's

Legend	Colour
INFO	$\textsf{\color{lightblue}Blue}$
SUCCESS	$\textsf{\color{lightgreen}Green}$
FAIL	$\textsf{\color{red}Red}$
TIPS	$\textsf{\color{yellow}Yellow}$

Reference

• https://linuxize.com/post/how-to-install-kvm-on-ubuntu-20-04
• https://www.freecodecamp.org/news/turn-ubuntu-2404-into-a-kvm-hypervisor
• https://serverfault.com/questions/803283/how-do-i-list-virsh-networks-without-sudo#:~:text=17,to%20espicify%20%2D%2Dconnect
• https://blog.wikichoon.com/2016/01/qemusystem-vs-qemusession.html?utm_source=chatgpt.com
• https://libvirt.org/drvqemu.html#driver-instances
• https://libvirt.org/formatnetwork.html#routed-network-config
• https://libvirt.org/formatnetwork.html#example-configuration