Check virt-manager with QEMU and KVM

Introduction

This article explains how to use virt-manager to manage virtual machines (VMs) with the help of QEMU and KVM. Although virt-manager is an independent application, it makes extensive use of QEMU and KVM for virtualization. While virt-manager is a user-friendly interface for managing virtual machines, understanding the underlying technology, especially KVM and its relationship to QEMU, is essential for effective virtualization management.

Understanding KVM: The Key to QEMU Hardware Acceleration

KVM (Kernel-based Virtual Machine) is a full virtualization technology for Linux on x86 hardware. It is built into the Linux kernel and provides a level of hardware virtualization, allowing multiple virtual machines to run on a single physical machine. KVM provides a virtualized CPU, memory, and I/O devices to each virtual machine, enabling them to run their own operating systems and applications.

QEMU (Quick Emulator) is an open-source, full-system emulator and virtualizer. It can run multiple architectures, including x86, ARM, and PowerPC. QEMU is often used for creating and testing virtual machines, but it can also be used as a standalone emulator. QEMU provides a software implementation of various devices, such as virtual CPUs, virtual GPUs, and virtual network interfaces.

When virt-manager is used with QEMU and KVM, KVM provides the hardware virtualization layer, while QEMU emulates the guest operating system and its hardware devices. This combination results in efficient virtualization with good performance.

Installing virt-manager, QEMU, and KVM

To install virt-manager, QEMU, and KVM on your system, follow these steps:

1. Update your system:

sudo apt update

2. Install the required packages:

sudo apt install virt-manager qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils

Creating a New Virtual Machine with virt-manager

After installing the necessary packages, start the virt-manager application. You will be presented with an empty virtual machine manager window. To create a new virtual machine, follow these steps:

1. Click on the "New" button in the toolbar.
2. Select "Local install media" and click "Forward".
3. Choose the operating system you want to install and click "Forward".
4. Configure the virtual machine's name, size, and other settings as needed.
5. Set up the network and storage for the virtual machine.
6. Click "Finish" to start the installation process.

Managing Virtual Machines with virt-manager

Once the virtual machine is created and installed, you can manage it using virt-manager. Some common tasks include:

• Starting and stopping the virtual machine.
• Monitoring the virtual machine's resources.
• Modifying the virtual machine's settings.
• Creating snapshots of the virtual machine.
• Exporting or importing virtual machines.

Conclusion

In this article, we have learned how to use virt-manager to manage virtual machines with the help of QEMU and KVM. We have covered the basics of KVM and its relationship to QEMU, as well as the installation and usage of these tools. With this knowledge, you will be well-equipped to manage virtual machines efficiently and effectively.