configure_bridge

configure_bridge.sh

#!/bin/bash

# this script will set up a bridge in a libvirt host that has network manager

if [ -z $1 ] || [ -z $2 ] || [[ $1 = -h ]] || [[ $1 = --help ]]; then
    echo "Usage: $0 [interface] [activate|deactivate]"
    exit 1
fi

IFACE=$1

if  ! command -v nmcli &> /dev/null ; then
    echo this script requires nmcli to be installed
    exit 2
fi

con=`nmcli -t -m tabular device show $IFACE | sed -n '6p'`
mac=`cat /sys/class/net/$IFACE/address`

echo con = $con mac = $mac

activate() {
    nmcli con add type bridge ifname br0 stp no bridge.mac $mac
    nmcli con add type bridge-slave ifname $IFACE master br0
    nmcli con down "$con"
    nmcli con up bridge-br0
    echo bridge activated.
    echo if you haven\'t already, create a libvirt network that uses br0 and assign it to the VM you want to network.
}

deactivate() {
    nmcli con del bridge-br0
    nmcli con del bridge-slave-$IFACE
    # restart NM, since we can't know which con was previously attached to the iface
    sudo systemctl restart NetworkManager
    echo bridge deactivated.
}

$2