proxmox list ips of running vms

_proxmox_bash_script_to_list_ips_with_qm_command.md

Description

A script that on a proxmox node, will list the ip addresses of running virtual machines.

Pre-requisites

install required packages :

apt-get install net-tools arp-scan

Running

make the above script executable

chmod +x get_ips_of_vms.sh

run the script

./get_ips_of_vms.sh

resulting in something like :

# ./get_ips_of_vms.sh
192.168.22.131 k8s-master 200-k8s-master
192.168.22.132 k8s-worker01 201-k8s-worker01
192.168.22.133 k8s-worker02 202-k8s-worker02

get_ips_of_vms.sh

#!/usr/bin/env bash

network="192.168.22.0/24"
qmids=$(qm list | grep running | awk '{print $1}')

for id in $qmids
do
	  name=$(qm list | grep -v stopped | grep $id | awk '{print $2}')
  	mac=$(qm config $id | egrep "^net0" | awk '/net0/ { print tolower($2) }' | sed "s/virtio=//" | cut -f1 -d',')
  	arp-scan --interface=vmbr0 $network | grep "$mac" | awk '{printf "%s ",$1}'
  	echo "$name $id-$name"
done

This is useful, thank you. I noticed a scenario in my environment where I grep with $id, and that value appeared elsewhere in the line as the PID. My $id value was 130, and I had a VM with a running PID of 1381306 in this case. By the time it reached setting $mac, I had a repeated name row with no other values returned.
As a workaround for the moment, i've swapped the grep and awk, so it strips out the PID column that might give false matches:
name=$(qm list | grep -v stopped | awk '{print $1" "$2}' | grep $id)
I then just split the Name from the ID separately after

Thank you

thanks for the tip ;-)
another solution is o use qm agent[1] instead of arp-scan

qm agent $id network-get-interfaces |grep \"ip-address\"

[1] https://pve.proxmox.com/pve-docs/qm.1.html

thanks a lot,
in your script network CIDR is hardcoded and arp-scanning is called for every qemu guest,
(multiple arp scanning sometimes hits EDR and intrusion SOC teams)

I added some variables

#!/usr/bin/env bash

def_interface=$(ip route get 1.1.1.1 | head -1 | cut -d ' ' -f 5)
network=$(ip  addr show $def_interface | fgrep 'inet ' | awk '//  {print $2}')

qmids=$(qm list | grep running | awk '{print $1}')

TMPFILE1=$(mktemp)
arp-scan --interface=$def_interface $network 1> $TMPFILE1 2>/dev/null

for id in $qmids
do
          name=$(qm list | grep -v stopped | grep $id | awk '{print $2}')
        mac=$(qm config $id | egrep "^net0" | awk '/net0/ { print tolower($2) }' | sed "s/virtio=//" | cut -f1 -d',')
        #arp-scan --interface=$def_interface $network 2>/dev/null | grep "$mac" | awk '{printf "%s ",$1}'
        cat $TMPFILE1 | fgrep "$mac" | awk '{printf "%s ",$1}'
        echo "$name $id $name"
done

/bin/rm -f $TMPFILE1