List KVM/Virsh Network Interface per VM

README.md

List KVM/Virsh Network Interface per VM

This script will list all VMs and the network interfaces attached to that VM.

Sample output:

smb:
	vnet1
system_prod:
	vnet8
system_test:
	vnet9
pabx:
	vnet2
	vnet3
management:
	vnet4
docker:
	vnet5
	vnet6
	vnet7

Added a script to list the network tree including the VM that is attached to the interface(if any):

lo
br0
    bond0.20@bond0
    vnet11 - VM: samba
    vnet16 - VM: docker
    vnet18 - VM: system_prod
br1
    bond0
       eno1
       eno2
       eno3
    vnet6 - VM: unifi
    vnet12 - VM: system_test
    vnet15 - VM: docker
br2
    bond0.30@bond0
    vnet4 - VM: pabx
    vnet17 - VM: docker
br3
    eno4
    vnet5 - VM: pabx

nettree

#!/bin/bash

DEFAULT_INDENT="   "
DIRECTION="DOWN"

function usage() {
    cat <<USAGEEND
The script prints network devices hierarchy as a tree view.
Possible arguments:
   -u     prints tree from bottom to up (default). Physical devices are roots of the tree.
   -d     prints tree from up to bottom. Logica, devices are roots of the tree.
USAGEEND
}

function printdown() {
    local indent="$1"
    devs="$2"
    for indev in $devs; do
        echo -n "$indent" "$indev"
        if [[ "$indev" == "vnet"* ]]; then
            echo -n " - VM: ${vmdev[$indev]}"
        fi
        echo
        printdown "$DEFAULT_INDENT$indent" "${devicesdown[$indev]}"
    done
}

function printup() {
    local indent="$1"
    devs="$2"
    for indev in $devs; do
        echo "$indent" "$indev"
        printup "$DEFAULT_INDENT$indent" "${devicesup[$indev]}"
    done
}

while [ ! -z "$1" ]; do
    case "$1" in
    -d)
        DIRECTION=DOWN
        ;;
    -u)
        DIRECTION=UP
        ;;
    -h)
        usage
        exit 0
        ;;
    *)
        usage
        exit 1
        ;;
    esac
    shift
done

declare -A vmdev
for vm in $(virsh list | grep running | awk '{print $2}'); do
    devs=$(virsh dumpxml $vm | grep "vnet" | sed "s/[^']*'\([^']*\)'[^']*/\1/g")
    for dev in $devs; do
        vmdev[$dev]=$vm
    done
done

declare -A devicesup
declare -A devicesdown
while read line; do
    dev=${line#*: }
    dev=${dev%%:*}
    devicesup[$dev]=""
    if [ -z "${devicesdown[$dev]}" ]; then
        devicesdown[$dev]=""
    fi
    if [[ "$line" == *" master "* ]]; then
        master=${line#* master *}
        master=${master%% *}
        devicesup[$dev]="${devicesup[$dev]} $master"
        devicesdown[$master]="${devicesdown[$master]} $dev"
    fi
done < <(ip -o link)

if [ "$DIRECTION" == "UP" ]; then

    for dev in ${!devicesup[@]}; do
        if [ -z "${devicesdown[$dev]}" ]; then
            echo $dev
            printup "$DEFAULT_INDENT" "${devicesup[$dev]}"
        fi
    done

else

    for dev in "${!devicesdown[@]}"; do
        if [ -z "${devicesup[$dev]}" ]; then
            echo $dev
            printdown "$DEFAULT_INDENT" "${devicesdown[$dev]}"
        fi
    done

fi

vmnet

#!/bin/bash

for vm in $(virsh list | grep running | awk '{print $2}')
do
	echo "$vm: " && virsh dumpxml $vm | grep  "vnet" | sed "s/[^']*'\([^']*\)'[^']*/\t\1/g"
done