File descriptors

if [[ $EUID > 0 ]]

  then echo "Run this script as root"

  exit

fi

BRIDGE="br0"

TAP="tap0"

INTERFACE="eth0"

echo "Adding bridge $BRIDGE"

ip link add name $BRIDGE type bridge

echo "Flushing interface $INTERFACE"

ip addr flush dev $INTERFACE

echo "Setting $BRIDGE as master of $INTERFACE"

ip link set $INTERFACE master $BRIDGE

echo "Adding tap $TAP"

ip tuntap add $TAP mode tap

echo "Setting $BRIDGE as master of $TAP"

ip link set $TAP master $BRIDGE

echo "Setting $INTERFACE, $BRIDGE and $TAP up"

ip link set up dev $INTERFACE

ip link set up dev $TAP

ip link set up dev $BRIDGE

echo "Stopping NetworkManager"

systemctl stop NetworkManager

echo "Requesting ip for $BRIDGE"

dhclient $BRIDGE

if [ $? -eq 0 ]; then

    echo "Requesting ip for $INTERFACE"

    dhclient $INTERFACE

    echo "Killing dhclient and starting NetworkManager"

    pkill -9 dhclient

    systemctl start NetworkManager

fi

##!/usr/bin/env bash

#!/usr/bin/env bash

set -eu

# Docker environment variabeles

    bridgeName="macvlan$deviceID"

    log "DEBUG" "bridgeName: $bridgeName"

    # kvm configuration:

    # get a file descriptor

    (( fd=$i+3 )) || true

    exec $fd>>/dev/macvtap$deviceID

    NET_OPTS="-netdev tap,id=net$i,vhost=on,fd=$fd -add-fd fd=${fd},set=2,opaque='rdwr:/dev/macvtap$deviceID'"

    NET_OPTS="-netdev tap,id=net$i,vhost=on,fd=$fd"

    NET_OPTS="-device virtio-net-pci,netdev=net$i,mac=$MAC $NET_OPTS"

    (( i++ )) || true