Introduction

I have split this guide into three parts. Part one deals with installing KVM/Libvirt.
Part two installs VNC to connect to your remote host to use Virtual Machine Manager (VMM), Useful if you are accessing the hypervisor via a Windows or Mac computer, Linux has a installable version of VMM, making this step optional or you can manage KVM/libvirt using the CLI tool virsh. Part three deals with installing Vagrant, again this is a optional step as you can just spin up virtual devices and connect them together.

Vagrant is used to spin up a virtual environment using KVM in this instance as a Hypervisor. it can be very useful as you can build a lab that is the same as your prod network or a reproducible lab used for your studies that can easily be destroyed and rebuilt in minutes.

This guide is based on a clean install of CentOS 7.3

Your machine must have a processor that can support environment.

Step 1 KVM/Libvirt CentOS packages to install

Update all packages
yum update -y

Install KVM/Libvirt packages
yum install -y qemu-kvm qemu-img libvirt virt-install libvirt-python libguestfs libguestfs-tools virt-manager

Start KVM/Libvirt and set to start on boot
systemctl enable libvirtd && systemctl start libvirtd

Check status of libvirtd - should show as active (running)
systemctl status libvirtd

Step 2 Create a bridge interface

A bridge interface is required for allowing VMs to access network that the hypervisor is connected to.

Find your machines physical by running the command ip add
ip_add

Create your bridge interface file
cd /etc/sysconfig/network-scripts/
vi ifcfg-br0

TYPE=Bridge
ONBOOT=yes
DEVICE=br0
BOOTPROTO=static
IPADDR=10.25.3.63
PREFIX=22
GATEWAY=10.25.0.1
DNS1=8.8.8.8

Add physical interface to bridge
vi ifcfg-eth0

BRIDGE=br0

Restart the network service
systemctl restart network

Verify br0 has the static IP address you have set
ip add
ip-add-br0

Step 3 Optional useful utilities

Some useful packages to install
yum install wget net-tools nano ntp

systemctl enable ntpd && systemctl start ntpd

Links

Part2
Part3