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Virtualization - Kernel Virtual Machine (KVM)

KVM is a virtualization solution that leverages hardware virtualization extensions like Intel VT or AMD-V for full virtualization. It uses kernel modules, QEMU, and libvirt to manage virtual machines. KVM is widely used in Linux distributions and offers benefits like isolation, emulation, and easy migration. It allows hosting multiple virtual machines with their images stored on a shared LVM storage that is connected via iSCSI. Management tools like virsh and virt-manager can be used to control the virtual machines from the command line or GUI.

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Virtualization KVM (Kernel-Based Virtual Machine) Solution
Virtualization sharing ●isolation ●emulation ●
KVM Full (Hardware-assisted) virtualization ●Intel VT, AMD-V ●Kernel Module ●QEMU ●libvirt (VMM) ●
KVM Very Active in the Linux Community ●Easy to Use ●Fully Control by ourselves ●Easy for the migration from or to other platforms ●
KVM In the Linux Kernel Source ●Almost Default VM Solution for GNU/Linux Distribution : Redhat, OpenSuse, Debian, Ubuntu... ●
Architecture
Architecture More then 1 Host ●1 LVM for VM image storage ●Using iSCSI between Host and LVM ●Using its own internal network for the connection between Host and LVM ●
Architecture At least bond 2 network interfaces (bonding) for the connection to LVM ●For the Host, it has 2 bridged network, 1 for WAN and 1 for LAN in PowerBase ●
Management use “virsh” and the tools started with “virt-” in console to manage the VMs ●We can also use a GUI tool called Virtual Machine Manager (virt-manager) on our GNU/Linux Desktop to manage the VMs ●
Fast Cloning For the Fast Cloning of VM images, we use LVM snapshot to do the fast cloning ●We have built up some standard image for the cloning of new VMs ●
Fast Cloning VM image Snapshot New img
P2V dd the image into the VM’s LVM device if we have the disk image ●
V2V For Xen image, if it uses the original kernel (Full virtualization), it can use directly on KVM; otherwise it has to install the original kernel before the boot in KVM ●For Virtual Box, VMware, there is a tool called qemu-img to convert those images to RAW data which could use in KVM. ●
V2V cont. package virt-goodies contains tools to convert the config file of VMWare to libvirt readable xml. ●
New VM Creation For Standard system, we have default VM to clone ●For those do not have default image, we can use virt-install to do the new VM installation ●
Live Migration Live migration means that we can move VMs for 1 Host to another same configuration Host without shutdown the VMs. ●
Virtualization Questions? ●