Install KVM in an Ubuntu Server

Install KVM in an Ubuntu Server following https://help.ubuntu.com/community/KVM/Installation instructions for Ubuntu 18.10 LTS:

Verify

• Check processor supports virtualisation:

egrep -c '(vmx|svm)' /proc/cpuinfo If output is 0 it means that your CPU doesn’t support hardware virtualization. If output is 1 or more it support hardware virtualisation ( NOTE: virtualisation should be enabled in the system BIOS)

• Now Install kvm-ok utility using below command, it is used to determine if your server is capable of running hardware accelerated KVM virtual machines.

sudo apt install cpu-checker and run kvm-ok command and verify the output.

Install KVM

• Execute:

sudo apt-get -y install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils virtinst && virsh list --all

virsh list --all
 Id    Name                           State
----------------------------------------------------

• service libvirtd status

It will create virbr0 and virbr0-nic interfaces and default network.

virsh net-list
 Name      State    Autostart   Persistent
--------------------------------------------
default   active   yes         yes

brctl show
bridge name	bridge id		STP enabled	interfaces
virbr0		8000.525400d54de6	yes		virbr0-nic

Following Ubuntu Documentation about KVM related Packages:

• libvirt-bin: provides libvirtd which you need to administer qemu and kvm instances using libvirt
• qemu & qemu-kvm: (kvm in Karmic and earlier) are the backend
• bridge-utils provides a bridge from your network to the virtual machines

Start & enable libvirtd service

Exceute the folowing comands:

• sudo service libvirtd start
• service libvirtd status

And create your fist guest machine from command line using virt-install python script.

• virt-install --install ubuntu20.04 --memory 500 --disk size=0.2

• virt-install --virt-type kvm --name buster-amd64 --memory 1G --cdrom ~/iso/Debian/debian-10.0.0-amd64-netinst.iso --disk size=10G --os-variant debian10

Optional software to install:

• apt-get install virt-top libguestfs-tools virtinst

Related commands

• virt-builder (libguestfs-tools package)
• virt-install (virtinst package)

Packages

• qemu-kvm, provides kvm binary and requires qemu-system-x86 package
• libvirt-daemon-system
• libvirt-clients, provides virsh client and virt-admin
• bridge-utils
• virtinst

See also

• Install KVM in an Ubuntu Server: qemu-kvm, libvirt-daemon-system
• KVM, Installation, QEMU, virsh, virtinst, libguestfs-tools, libvirt, qemu, Red Hat Virtualization (RHV), MacVTap, Virtio, oVirt, KVM services, KVM networking, KVM graphics, CPU, KVM on ARM