Virtual kvm

Author: k | 2025-04-24

Managing the Virtual KVM; Configuring Virtual Media; Managing Serial over LAN; Managing the Virtual KVM. KVM Console. The KVM console is an interface accessible from

thuctap /XuanSon/Virtualization/Virtual Machine/KVM/KVM

This tutorial will teach you how to rename KVM guest virtual machine from command line in Linux. I have a few virtual machines running with different Linux flavors in my KVM server. For the sake of easy reference, I always name each VM with the OS version or application that is currently running on that VM. For example, if a VM is running with CentOS 8 minimal edition, I would name it as "centos8". If Apache web server is installed on the CentOS 8 VM, then the name of the KVM guest would be "apache_centos8" and so on. Today, I'd like to test Nginx on CentOS 8 VM, so renamed it to "nginx_centos8" as described below.Rename KVM Guest Virtual Machine In Linux1. Rename KVM virtual machine using “virsh domrename”2. Rename KVM virtual machine by modifying its XML fileRename KVM Guest Virtual Machine In LinuxWe can change the name of a VM on KVM using virsh command line utility in two ways:Using "domrename" command,Manually modifying VM's XML configuration file.First, we will see how to rename a KVM VM using "virsh domrename" command.1. Rename KVM virtual machine using "virsh domrename"The "virsh domrename" command is used to rename a domain. This command changes current domain name to the new name without making any changes in the configuration files.The typical usage of "virsh domrename" command is:virsh domrename Please note that the domain must be inactive and without snapshots or checkpoints.First, make sure the KVM guest virtual machine is turned off.$ virsh list --allSample output:

KVM (Kernel-based Virtual Machine) KVM

In the world of virtualization, QEMU and KVM are two critical players. They are essential for creating and managing virtual machines, allowing organizations and individuals to fully leverage the potential of virtualization across various applications. So, how do you determine which one is more suitable for you? Let’s take a look at the differences between QEMU and KVM, as well as the advantages and disadvantages of these two virtualization technologies.What is KVM?KVM, or Kernel-based Virtual Machine, is an open-source virtualization technology. KVM runs as part of the Linux kernel and leverages hardware extensions such as Intel VT or AMD-V to achieve efficient hardware-assisted virtualization. By integrating with the host operating syste’s kernel, KVM reduces overhead and provides higher performance than pure software solutions like QEMU. In fact, KVM offers the virtualization framework, while QEMU is often used as a user-space component to emulate devices. In a KVM architecture, virtual machines are implemented as regular Linux processes, scheduled by the standard Linux scheduler. Each virtual CPU appears as a regular Linux process, allowing KVM to benefit from all the features of the Linux kernel. KVM itself doesn’t perform any emulation; instead, it requires a user-space program to set up a guest virtual machine’s address space via the “/dev/kvm” interface, provide simulated I/O, and map its video output back to the host’s display. Currently, this program is QEMU.What is QEMU?QEMU, or Quick Emulator, is an open-source hardware virtualization software that can run virtual machines on different host platforms. Unlike KVM, which focuses on hardware-assisted virtualization, QEMU uses full-system emulation and can simulate an entire computer system, including the processor, memory, storage, and peripheral devices. This flexibility makes QEMU an excellent choice for cross-platform virtualization, as it supports a variety of architectures.The Relationship Between KVM and QEMUTo illustrate this, let’s compare building a

Virtualization - Kernel Virtual Machine (KVM)

KVM hypervisor. KVM as included with Canonical Ubuntu Explore how Canonical Ubuntu Server can run in the mainframe environment as virtualized by the KVM hypervisor. Red Hat OpenShift Container Platform on IBM LinuxONE Install a Red Hat OpenShift Container Platform by using minimum requirements and KVM hypervisor provided by Red Hat Enterprise Linux. Related products IBM Cloud Infrastructure Center Leverage lifecycle management for the virtual infrastructure provided by Cloud Infrastructure Center, based on Red Hat KVM (and IBM z/VM) and enabled by the automation of infrastructure services. IBM z16 Use IBM z16 as a hardware platform for KVM to take advantage of capabilities such as high performance, high availability, high scalability and security. IBM LinuxONE 4 Choose IBM LinuxONE 4 as a hardware platform for KVM to maximize the benefits of scalability, sustainability, superior performance and advanced security features. IBM Hyper Protect Virtual Servers Attain easy deployment of Secure Execution guests for digital assets use cases and scale the deployment of isolated workloads protected by Confidential Computing. IBM z/VM Use an operating system with highly secure and scalable hypervisor and virtualization technology designed to run Linux, z/OS®, z/VSE® and z/TPF virtual machines, as well as Red Hat® OpenShift® on IBM Z and LinuxONE servers.. Managing the Virtual KVM; Configuring Virtual Media; Managing Serial over LAN; Managing the Virtual KVM. KVM Console. The KVM console is an interface accessible from

kvm virtualization - QEMU / KVM - Dedicated 802.1q VLAN

KVM for IBM Z® and LinuxONE is an open-source alternative to the IBM z/VM hypervisor for the virtualization of Linux® workloads on IBM Z and IBM LinuxONE systems. Faced with rising data demands and security concerns, Kernel-based Virtual Machine (KVM) open-source virtualization can help you to effectively meet these demands on your IBM Z and LinuxONE systems. KVM’s flexibility as a hypervisor, coupled with its open-source nature makes it a perfect choice for virtualization. KVM on IBM Z and LinuxONE on Blogspot Browse KVM documentation to learn how to get started, find news and get hints about running KVM on IBM Z and LinuxONE. Benefits Standardizes configuration and operation Promotes operational standardization through its architecture-agnostic characteristics, which make it compatible with platforms such as IBM Z and LinuxONE. Enables confidential computing Provides confidential computing for VMs based on IBM® Secure Execution for Linux for maximum security. Leverages common Linux administration skills Provides a standard set of Linux tools and interfaces that offer a common user experience across various platforms, making it easy for clients looking for trained staff to administrate their KVM deployments. Features Security Using IBM Secure Execution IBM Secure Execution protects the data of workloads that run in a KVM and safeguards VMs from inspection, modification or compromise by other VMs or the KVM administrator. Explore IBM Secure Execution for Linux High availability Live virtual server migration Live virtual server migration enables the relocation of Linux guests around the KVM cluster without affecting the virtual server. Explore Live Virtual Server Migrate Infrastructure management Simplified infrastructure management Get simplified infrastructure-as-a-service management for the virtual infrastructure that is based on Red Hat® KVM. Explore IBM Cloud® Infrastructure Center Security Extensive use of encryption KVM supports the on-chip crypto acceleration and the Crypto Express adapter available with the IBM Z and LinuxONE platforms. Explore IBM® Crypto Express features Use cases Server consolidation Consolidate servers with KVM on the highly scalable IBM Z and LinuxONE systems to get high-density savings in terms of power consumption and floor space. Explore sustainability with IBM z16™ Explore sustainability with IBM LinuxONE 4 Confidential computing Protect digital assets by hosting them with KVM on IBM Z and LinuxONE, using IBM® Hyper Protect Virtual Servers for easy-to-use on-prem deployments. Explore Hyper Protect Virtual Servers Resources KVM on IBM Z See documentation on how to set up, configure and operate Linux as a guest of the KVM hypervisor. KVM as included with Red Hat Enterprise Linux Explore how Red Hat Enterprise Linux can run in the mainframe environment as virtualized by the KVM hypervisor. KVM as included with SUSE Linux Enterprise Server Learn how SUSE Linux Enterprise Server can run in the mainframe environment as virtualized by the

kvm virtualization - Linux KVM if guest is rebooted it will not start

IntroductionVirtualization has become a fundamental technology in the world of computing, allowing organizations and individuals alike to maximize their hardware resources, improve efficiency, and enhance flexibility in managing their IT infrastructure. In the realm of Linux, two popular virtualization solutions stand out: Kernel-based Virtual Machine (KVM) and VirtualBox. In this article, we will delve deep into the intricacies of both KVM and VirtualBox, providing you with an extensive comparison to help you make an informed decision when selecting the ideal virtualization solution for your Linux system.What is Virtualization?Before diving into the specifics of KVM and VirtualBox, let's first establish a clear understanding of virtualization itself. Virtualization is the practice of creating virtual versions of computing resources, such as servers, storage, and networking, to optimize resource utilization, improve isolation, and streamline management. The primary benefit of virtualization is its ability to run multiple virtual machines (VMs) on a single physical server, each operating independently with its own guest operating system (OS) while sharing the underlying hardware.KVM (Kernel-based Virtual Machine)KVM, short for Kernel-based Virtual Machine, is an open source virtualization solution built directly into the Linux kernel. It offers a robust and high-performance virtualization environment that leverages hardware virtualization extensions found in modern CPUs. Here's a closer look at KVM's key attributes: Architecture and Components Hypervisor: KVM leverages the Linux kernel as its hypervisor, allowing it to benefit from the kernel's stability and security features. QEMU (Quick Emulator): QEMU provides the user-space component for managing virtual machines, including device emulation and CPU emulation. Features and Capabilities Full virtualization support: KVM provides hardware-assisted virtualization, offering near-native performance for guest VMs. Live migration: KVM allows you to move running VMs from one physical host to another without service interruption. Extensive hardware support: It can run a wide range of guest OSs, including Windows, Linux, and more. Virtio drivers: Virtio-based drivers offer enhanced I/O performance for virtual machines. Performance and Scalability KVM's direct integration with the Linux kernel results in excellent performance, making it suitable for enterprise-level workloads. It can efficiently scale to support numerous virtual machines on a single host. Supported Guest Operating Systems KVM supports a broad array of guest operating systems, including various Linux distributions, Windows, and FreeBSD. Management Tools and Interfaces Libvirt: A popular management framework that provides a common API for managing virtualization technologies, including KVM. virt-manager: A user-friendly graphical interface for managing KVM virtual machines. VirtualBoxVirtualBox, developed by Oracle, is a versatile and user-friendly virtualization platform suitable for both desktop and server environments. It stands out as an excellent choice for developers, testers, and hobbyists looking for an easy-to-use virtualization solution. Here's an overview of VirtualBox: Architecture and Components Hypervisor: VirtualBox employs a type 2 hypervisor, which runs on top of the host operating system. Virtual Machine Monitor (VMM): The VMM component manages the virtualization process. Features and Capabilities Cross-platform compatibility: VirtualBox supports multiple host platforms, including Linux, Windows, macOS, and more. Snapshot functionality: You can take snapshots of virtual machines for easy backup and recovery. VirtualBox Extension Pack:

KVM or Virtual KVM switch for keyboard and mouse across

Virtual machine image that is ready to run on a particular hypervisor. The launch script for each unified OVA package provides the model and other required parameters to launch vWAAS with WAAS in the required configuration. Here are examples of the unified OVA and NPE OVA package filenames for vWAAS on RHEL KVM: OVA—Cisco-KVM-vWAAS-Unified-6.4.1-b-33.tar.gz NPE OVA—Cisco-KVM-vWAAS-Unified-6.4.1-b-33-npe.tar.gz The unified OVA package for vWAAS on RHEL KVM/KVM on CentOS contains the following files. Flash disk image Data system disk Akamai disk INSTRUCTIONS.TXT—Describes the procedure for deploying the virtual instance and using the launch.sh file. package.mf template file and bootstrap-cfg.xml—These two files work together on the Cisco NFVIS platform with the image_properties.xml file as Day-0 configuration template. ezdeploy.sh—The script used to deploy vWAAS on UCS-E. exdeploy_qstatus.exp—The dependent file for ezdeploy.sh script image_properties.xml A VM configuration template file used on the Cisco NFVIS platform. launch.sh—The launch script to deploy Cisco vWAAS on Linux KVM. vm_macvtap.xml—Configuration file for vWAAS deployment using host machine interfaces with the help of the macvtap driver. vm_tap.xml—Configuration file for vWAAS deployment using virtual bridge or OVS (Open Virtual Switch) present in the host machine. Installing vWAAS on KVM for WAAS Version 6.4.1 and Later This section contains the following topics: Using the Launch Script to Deploy vWAAS on RHEL KVM on CentOS for WAAS Version 6.4.1 and Later Using the EzDeploy Script to Deploy vWAAS on RHEL KVM on CentOS for WAAS Version 6.4.1 and Later Note For how to install vWAAS with NFVIS on Cisco ENCS 5400 Series, see the Cisco vWAAS Bundled Image Upgrade for ENCS 5400 Series, with RMA Process for Cisco EOS/EOL WAVE Devices. Using the Launch Script to Deploy vWAAS on RHEL KVM on CentOS for WAAS Version 6.4.1 and Later To use the launch script (launch.sh) to deploy Cisco vWAAS or vCM on RHEL

What is a KVM Virtual Machine?

NVIDIA Virtual GPU Software Documentation - v16.0 through 16.9 (all) - Last updated January 13, 2025 - Send Feedback NVIDIA Virtual GPU Software Documentation v16.0 through 16.9 Learn how to use NVIDIA® RTX Virtual Workstation (vWS), NVIDIA Virtual PC, and NVIDIA Virtual Applications. What's New What's new in NVIDIA vGPU software for all supported hypervisors. Supported Products An at-a-glance summary of supported hardware, hypervisor software versions, and guest operating system (OS) releases for this release of NVIDIA virtual GPU software. Quick Start Guide Documentation for system administrators that provides minimal instructions for installing and configuring NVIDIA virtual GPU software. Hypervisor Release Notes XenServer Current status, information on validated platforms, and known issues with NVIDIA virtual GPU software and hardware on XenServer. Linux with KVM Current status, information on validated platforms, and known issues with NVIDIA virtual GPU software and hardware on supported Linux with KVM hypervisors. Microsoft Azure Local Current status, information on validated platforms, and known issues with NVIDIA virtual GPU software and hardware on Microsoft Azure Local. Microsoft Windows Server Current status, information on validated platforms, and known issues with NVIDIA virtual GPU software and hardware on Microsoft Windows Server. Red Hat Enterprise Linux with KVM Current status, information on validated platforms, and known issues with NVIDIA virtual GPU software and hardware on Red Hat Enterprise Linux with KVM. Ubuntu Current status, information on validated platforms, and known issues with NVIDIA virtual GPU software and hardware on Ubuntu. VMware vSphere Current status, information on validated platforms, and known issues with NVIDIA virtual GPU software and hardware on VMware vSphere. Nutanix AHV is supported on this release of NVIDIA vGPU software as a generic Linux with KVM hypervisor. Virtual GPU and Pass-Through GPU Virtual GPU Software User Guide NVIDIA virtual GPU software enables multiple virtual machines (VMs) to have. Managing the Virtual KVM; Configuring Virtual Media; Managing Serial over LAN; Managing the Virtual KVM. KVM Console. The KVM console is an interface accessible from

KVM Virtualization on IBM Z

VMware Workstation 10 comes with a handy utility which allows you to switch between active VMs (virtual machines) using a configurable hot key just like a KVM (Keyboard Video Mouse) switch. The benefit of using the VMware KVM utility is the VMs can be run in full-screen without launching the Workstation 10 interface (no tool bar) and manage their power state via CLI (command line interface). Another additional benefit from an IT perspective is running a virtual machine for the user when Windows is launched and the user can seamlessly switch between the operating systems by using the defined hotkey.Note: The VMware KVM mode is only available for Windows version of Workstation 10.x.Below is a brief example with screen shots and short video on how I setup and used VMware KVM mode with desktop shortcuts on my Win 8.1 computer. *** Not all steps are included in this blog post and the location of your files might be different so please reference Knowledge Base article KB2057914 and VMware KVM Guide (pdf) for detailed information on using the VMware KVM utility.The first step in configuring VMware KVM mode is setting the hotkeys and preferences. Open up a command prompt and change to the directory where Workstation is installed. Launch the VMware KVM executable with the “–preferences” after the command.Upon launching “vmware-kvm.exe –preferences” command you will see a small GUI window that allows you to change the default hot keys in addition to other features for launching and exiting the virtual machine.If you use multiple monitors like I am you can change the physical monitor on which the selected virtual machine runs in full screen mode as shown below. Click OK to exit the utility and save you KVM preferences.The second step is to execute the vmware-kvm.exe command with a pointer to

KVM virtualization on IBM Z

Computer emulator, and KVM provides acceleration for the emulation of the computer.QEMU vs. KVM: DifferencesBoth KVM and QEMU are powerful technologies, and you can use them depending on the project size and objectives. To compare QEMU and KVM, let’s analyze these two technologies in terms of performance, device support, management, and usability:1. Performance and Efficiency Due to its full-system emulation approach, QEMU is more resource-intensive than KVM. Since QEMU simulates both hardware and the guest operating system, it incurs higher overhead, which could lead to performance bottlenecks, especially for compute-intensive workloads. Additionally, QEMU relies on software virtualization, which may limit its ability to achieve optimal performance in some scenarios. KVM, as a kernel-based virtualization technology, enjoys the advantages of hardware-assisted virtualization. This allows KVM to directly access the host processor’s virtualization extensions, reducing overhead and improving performance. By leveraging the host kernel for memory management and CPU scheduling, KVM ensures that virtual machines run efficiently at near-native speeds. For resource-intensive workloads and performance-critical applications, KVM usually outperforms QEMU.2. Device and Platform Support QEMU focuses on full-system emulation, offering broad device and platform support. QEMU can simulate many hardware components, making it a versatile option for running virtual machines on different architectures, including x86, ARM, PowerPC, and others. This versatility makes QEMU an excellent choice for developers and testers who need to work across multiple platforms. On the other hand, KVM relies on hardware-assisted virtualization, so its platform support is limited to systems with specific virtualization extensions (such as Intel VT or AMD-V). Thus, KVM is mainly suitable for x86-based systems and is less versatile than QEMU when it comes to cross-platform virtualization.3. Ease of Use and Management QEMU’s full-system emulation approach provides a more intuitive and user-friendly interface. Setting up virtual machines with QEMU is relatively simple, and its compatibility. Managing the Virtual KVM; Configuring Virtual Media; Managing Serial over LAN; Managing the Virtual KVM. KVM Console. The KVM console is an interface accessible from Figure 1 illustrates how the KVM hypervisor virtualizes the IBM Z resources for Linux on KVM. Figure 1. KVM virtualization. The KVM hypervisor defines the CPUs, memory, and virtual

Creating a KVM Virtual Machine

Cisco vWAAS on RHEL KVM and KVM CentOS This chapter describes the hypervisors supported for Cisco vWAAS and the procedures used to install each hypervisor on Cisco vWAAS, and contains the following sections: About vWAAS on RHEL KVM Supported Host Platforms, Software Versions, and Disk Type vWAAS on KVM System Requirements vWAAS on RHEL KVM for WAAS Version 5.x to 6.2.x vWAAS on RHEL KVM for WAAS Version 6.4.1 and Later vWAAS on SUSE Linux for WAAS Version 6.4.1b and Later vWAAS with SR-IOV About vWAAS on RHEL KVM Cisco vWAAS on RHEL KVM (Red Hat Enterprise Linux Kernel-based Virtual Machine) is a virtual WAAS appliance that runs on a KVM Hypervisor. The Cisco vWAAS on RHEL KVM solution extends the capabilities of ISR-WAAS and vWAAS running on the Cisco UCS-E Series and the ENCS-5400 Series. Cisco vWAAS on RHEL KVM is available for vWAAS with WAAS Version 6.2.1 and later, Cisco vWAAS on KVM on CentOS (Linux Community Enterprise Operating System) is available for vWAAS with WAAS version 6.2.3x and later. Note Cisco vWAAS on RHEL KVM can also be deployed as a tar archive (tar.gz) to deploy Cisco vWAAS on Cisco Network Functions Virtualization Infrastructure Software (NFVIS). The NFVIS portal is used to select the tar.gz file to deploy vWAAS. Supported Host Platforms, Software Versions, and Disk Type Table 6-1 shows the platforms and software versions supported for vWAAS on Microsoft Hyper-V. Table 6-1 Platforms and Software Versions Supported for vWAAS on VMware ESXi PID and Device Type Minimum WAAS Version Host Platforms Minimum Host Version Disk Type PID: OE-VWAAS-KVM Device Type: OE-VWAAS-KVM 6.2x Cisco UCS Cisco UCS-E Series RHEL CentOS 7.1 virtio vWAAS on KVM System Requirements vWAAS on RHEL KVM has a predefined configuration with specific requirements for CPU and memory. However, there are some features