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We also use CentOS 7 on the real machines. This makes life easier, because we only need to know CentOS config style. Of cause you could use other Linux distribution on the real host.

1. Step: Follow LinuxTechi Guide

2. Step: prepare for live backups

Required packages:

cat << EOF > /etc/yum.repos.d/qemu-kvm-rhev.repo
[qemu-kvm-rhev]
name=oVirt rebuilds of qemu-kvm-rhev
baseurl=http://resources.ovirt.org/pub/ovirt-3.5/rpm/el7Server/
mirrorlist=http://resources.ovirt.org/pub/yum-repo/mirrorlist-ovirt-3.5-el7Server
enabled=1
skip_if_unavailable=1
gpgcheck=0
EOF

yum install qemu-kvm-rhev libvirt bridge-utils
# qemu-img is not needed

Start libvirt:

systemctl start libvirtd
systemctl enable libvirtd

Networking

We use bridge networking API. Things you need to do is:

1. real host: all IPs must run on the bridge interface and not on the real network
2. real host: assign the bridge device to your real network interface
3. VM: assign the VM to your new bridge device

This is perfectly explained here: https://www.linuxtechi.com/install-kvm-hypervisor-on-centos-7-and-rhel-7/