virtualization - kernel virtual machine (kvm)

VirtualizationKVM (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?