{"id":8203,"date":"2024-09-20T17:00:22","date_gmt":"2024-09-20T14:00:22","guid":{"rendered":"http:\/\/trueconf.com\/blog\/?p=8203"},"modified":"2025-07-16T12:58:14","modified_gmt":"2025-07-16T09:58:14","slug":"configure-kvm-hypervisor-ubuntu-server","status":"publish","type":"post","link":"https:\/\/trueconf.com/blog\/knowledge-base\/configure-kvm-hypervisor-ubuntu-server","title":{"rendered":"Configuration of KVM hypervisor on Linux Using Ubuntu as Example"},"content":{"rendered":"

TrueConf Server can be deployed on a virtual machine (VM). However, this is a very complex task and we do not recommend this procedure to inexperienced users: correct configuration of a virtual machine may sometimes be very difficult. <\/p>\n

This guide will describe the configuration of the KVM hypervisor (Kernel-based Virtual Machine). We will take the example of the server running on Ubuntu 22.04 LTS. However, the instructions provided below may be helpful if any Linux distribution is used since KVM is a part of the kernel.<\/p>\n

Below we will show how to use KVM with the help of the terminal and on Linux with a graphical shell.
\n<\/p>\n

Updating packages<\/h2>\n

Before starting, update packages by running the command:<\/p>\n

sudo apt update && sudo apt upgrade -y<\/pre>\n
How to check if KVM is supported<\/h2>\n
The KVM module is a hardware-based virtualization tool based on Intel VT or AMD SVM; so, this method cannot be used on CPUs that do not support this technology.<\/p>\n
Run this command in the terminal to check if hardware-based virtualization is supported:<\/p>\n
egrep -c '(vmx|svm)' \/proc\/cpuinfo<\/pre>\n
In this case the program displays 4<\/code>. If the result displayed by the program is larger than 0<\/b>, hardware-based virtualization is supported. Here, the result is equal to 4<\/b>.<\/p>\n
KVM configuration<\/h2>\n
KVM installation<\/h3>\n
Run this command to install the packages needed for virtualization:<\/p>\n
sudo apt install -y qemu-kvm virt-manager libvirt-daemon-system virtinst libvirt-clients bridge-utils<\/pre>\n
If you are using Linux that supports the graphical shell, you can also install the virt-manager<\/b> utility which will provide you with a graphic user interface (GUI) for managing virtual machines.<\/p>\n
sudo apt install -y virt-manager<\/pre>\n
After installing KVM, you can start its configuration. <\/p>\n
How to enable virtualization<\/h3>\n
Run the Libvirt<\/b> service with these commands: <\/p>\n
\r\nsudo systemctl enable --now libvirtd\r\nsudo systemctl start libvirtd\r\n<\/pre>\n
After launching the service, restart the computer and check the status of the Libvirt<\/b> service by running the command:<\/p>\n
sudo systemctl status libvirtd<\/pre>\n
Adding a user to KVM and Libvirt groups<\/h3>\n
To make sure that the OS account you are using was allowed to create and manage virtual machines, this account should be added to KVM and Libvirt groups. For this purpose, execute these commands:<\/p>\n
sudo usermod -aG kvm,libvirt $USER<\/pre>\n
Creation of a network bridge<\/h2>\n
If you are intending to access the virtual machine from outside the network, then it is necessary to create a network bridge for this machine.<\/p>\n
We will show how one can connect to a virtual machine via an Ethernet port of the host. Let us suppose that the port is connected to the router that distributes IPv4 addresses via DHCP and the VM will receive an IP address in the same way. Please note that the configuration of the yaml file on your PC may differ from the example below. So, we recommend checking the documentation<\/a>.<\/p>\n
    \n
  1. Get the list of network interfaces in the host OS:<\/li>\n
    ip a<\/pre>\n
    For example, the following result is displayed:<\/p>\n
    \r\n1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000\r\nlink\/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00\r\ninet 127.0.0.1\/8 scope host lo\r\nvalid_lft forever preferred_lft forever\r\ninet6 ::1\/128 scope host\r\nvalid_lft forever preferred_lft forever\r\n2: enp1s0:  mtu 1500 qdisc fq_codel state UP group default qlen 1000\r\nlink\/ether c0:3e:ba:28:f6:93 brd ff:ff:ff:ff:ff:ff\r\ninet 10.140.1.108\/22 brd 10.140.3.255 scope global dynamic noprefixroute enp1s0\r\nvalid_lft 28101sec preferred_lft 28101sec\r\ninet6 fe80::dc33:1ae7:97d0:524a\/64 scope link noprefixroute\r\nvalid_lft forever preferred_lft forever\r\n<\/pre>\n
  2.  Select the required interface, for example, enp1s0<\/code>.<\/li>\n
  3. In the directory \/etc\/netplan<\/b> create the file 01-netcfg.yaml<\/b> with the following text:<\/li>\n
    \r\nnetwork:\r\n  version: 2\r\n  renderer: NetworkManager\r\n  ethernets:\r\n    enp1s0:\r\n      dhcp4: true\r\n      dhcp6: true\r\n  bridges:\r\n    br0:\r\n    interfaces: [enp1s0]\r\n      dhcp4: true\r\n      dhcp6: true\r\n<\/pre>\n
    To create a file with the help of the terminal, you may use this command:<\/p>\n
    nano \/etc\/netplan\/01-netcfg.yaml<\/pre>\n
    To apply changes, execute the command:<\/p>\n
    sudo netplan apply<\/pre>\n
    After applying changes, run the following command to check if the network bridge has been added:<\/p>\n
    ip add show<\/pre>\n
    Make sure that the network interface br0<\/b> is included in the list.<\/p>\n
    Working with virtual machines<\/h2>\n
    How to create a virtual machine with the help of the terminal<\/h3>\n
    To create a virtual machine, run this command:<\/p>\n
    \r\nvirt-install --name [virtual machine name] --vcpu [number of allocated threads] --memory [amount of allocated RAM in MB] --network [network interface] --boot [boot device priority] --disk [virtual disk location, size in GB] --cdrom [path to CD-ROM]\r\n<\/pre>\n
    \u0433\u0434\u0435:<\/p>\n