Qemu is nice and highly configurable. Compared to other virtual environments, it is much more flexible, offering a lot of potential. However, it can sometimes be daunting to use due to the overwhelming number of options.
Fortunately, the community has developed a user-friendly UI
interface for Qemu, which aids in the configuration and setup
process. This is known as the Virtual Machine Manager, or
virt-manager (Ref. 1).
First check if the virtual machine is enabled in your machine:
egrep -c '(vmx|svm)' /proc/cpuinfo
This counts the occurrences of the vmx/svm features supported by your CPU. The result should be a number equal to the number of cores in your machine.
If the number received from that command is '0', it means that the virtualization feature needs to be enabled in the BIOS.
Ensure that the following packages are installed on your PC, or install them if necessary:
sudo apt install qemu-system-x86 libvirt-daemon bridge-utils virt-manager
The bridge-utils will come at handy next in this page.
Add the user to the virtualization groups:
sudo usermod -aG libvirt andi
sudo usermod -aG kvm andi
Ensure the libvirt daemon is enabled at boot time and restart it with the following commands:
sudo systemctl enable libvirtd
sudo systemctl start libvirtd
At this point, we are ready to start our virt-manager.
This part is largely inspired by Veronica's vlog, which I found to be very neat and clear, devoid of the usual extra fluff found in blogs. If you encounter any issues setting up virt-manager, check out her video (Ref. 2).
While setting up the virtual machine in the previous section, you were asked about the network interface to use. For this we will setup an ad-hoc bridge that will connect our Virtual OS to the network.
A network bridge is a virtual network that forwards packets to our physical interface.
In the picture
eno1 represent the physical ethernet
interface. We need to create a
interface where to which the Virtual Machines will be connected.
All their traffic will be routed by the bridge to eno1, enabling
our virtual machines to connect to the network.
Let's start by creating the bridge:
ip link add name br0 type bridge
Enable the interface:
ip link set dev br0 up
Let's assign it the address 192.168.1.201. It needs to be in the same network domain of the network where the PC is connected, in order to be able to be routed outside:
ip address add 192.168.1.201/24 dev br0
Now we set up the default gateway:
ip route append default via 192.168.1.1 dev br0
And finally we link the virtual interface
the physical interface
ip link set eno1 master br0
Now the network on the Virtual Devices should be up and running and they can be assigned their own address through dhcp.
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