yum group install -y "Development Tools"
yum -y install qemu-kvm libvirt virt-install bridge-utils libvirt-devel libxslt-devel libxml2-devel libvirt-devel libguestfs-tools-c
echo "net.ipv4.ip_forward = 1"|sudo tee /etc/sysctl.d/99-ipforward.conf
sysctl -p /etc/sysctl.d/99-ipforward.conf