Some qemu scripts

br.sh

#/bin/sh

IFACE=enp59s0f1

test $UID -ne 0 && echo Need root && exit 1

modprobe tun

s6-rc -v2 -d change dhcpcd
wait $(pgrep -x dhcpcd)

ip tuntap add dev tap0 mode tap
ip link add br0 type bridge
ip link set $IFACE down
ip link set $IFACE master br0
ip link set tap0 master br0
ip link set br0 up
ip link set $IFACE up
ip link set tap0 up
dhcpcd br0
vde_switch -t tap0 -s /tmp/tap0 -m 775 -g rio
pkill -x dhcpcd
ip link set $IFACE down
ip link set tap0 down
ip link set br0 down
ip link del br0
ip tuntap del tap0 mode tap
ip link set $IFACE up

s6-rc -v2 -u change dhcpcd

# Run vm with -net nic,macaddr=$MAC -net vde,sock=/tmp/tap0

create.sh

#!/bin/sh
if (($# < 1)); then
    echo $0 name
    exit
fi
if [ -e $1 ]; then
    echo exists
    exit
fi

mkdir "$1"
PORT=$(for i in {1080..1100}; do if ! grep PORT=$i */start.sh &> /dev/null; then echo $i; break; fi; done)
echo "
#!/bin/sh
cd \$(dirname $0)
PORT=$PORT
echo \$PORT
qemu-system-x86_64 -enable-kvm -m 2048 -drive "file=$1.img,if=virtio" -vga qxl -soundhw all -net nic,model=virtio,macaddr=\$(../macaddr.sh $1) -net vde,sock=/tmp/tap0/ -monitor stdio -spice port=\$PORT,disable-ticketing -device virtio-serial-pci -device virtserialport,chardev=spicechannel0,name=com.redhat.spice.0 -chardev spicevmc,id=spicechannel0,name=vdagent \$@
" > "$1/start.sh"
chmod +x "$1/start.sh"
qemu-img create -f qcow2 "$1/$1.img" 10G
echo Done

macaddr.sh

#!/bin/bash
if [ -z $1 ]; then
     echo "$0 <name>" 1>&2
     exit 1
fi
S=$(md5sum <<< $1 | awk '{print toupper($0)}')
echo "52:54:00:${S:0:2}:${S:2:2}:${S:4:2}"

mountQcow2.sh

#!/bin/sh
modprobe nbd
qemu-nbd -c /dev/nbd0 $1
read -p Waiting...
qemu-nbd -d /dev/nbd0

nat.sh

#/bin/sh
test $UID -ne 0 && echo Need root && exit 1
modprobe tun
ip tuntap add dev tap0 mode tap
sleep 0.5
ip addr add 10.120.0.1/24 dev tap0
ip link set tap0 up
iptables -t nat -A POSTROUTING -s 10.120.0.0/24 -j MASQUERADE
#iptables -I INPUT 1 -i tap0 -j ACCEPT
dnsmasq -p 0 -F 10.120.0.10,10.120.0.50,12h -O 6,1.1.1.1,1.0.0.1 -i tap0 -z
vde_switch -t tap0 -s /tmp/tap0 -m 775 -g rio
killall dnsmasq
#iptables -D INPUT -i tap0 -j ACCEPT
iptables -t nat -D POSTROUTING -s 10.120.0.0/24 -j MASQUERADE
ip tuntap del dev tap0 mode tap

# Run vm with -net nic,macaddr=$MAC -net vde,sock=/tmp/tap0

start-img.sh

#!/bin/bash
if [ -z $1 ]; then
     echo "$0 <name>" 1>&2
     exit 1
fi
cd $(dirname $0)
name=$1
shift
qemu-system-x86_64 -enable-kvm -m 2048 -hda $name -net nic,macaddr=$(../macaddr.sh $name) -net vde,sock=/tmp/tap0/ -monitor stdio $@