Find IP of VM running KVM

Question

How can I find the IP of the VM on KVM(using Nmap)? If not,are there any functions in Libvirt to do that?

Answer 1

Fast and dirty example for KVM on Centos 63 x86_64. Short ping in background to all possible IP addresses that the VMs may have in this segment

for i in {1..249}
 do
  ping -c 1 -n -q -r  -t 1 -s 1  -W 1   192.168.100.$i > /dev/null &
done

Extract the names and MAC addresses of the VMs via virsh and extract IP from ARP table

for name in `virsh list | grep running | awk '{ print $2 }'`
do
  printf  "\n$name\n "
  arp -e | grep "`virsh dumpxml  $name | grep "mac address"|sed "s/.*'\(.*\)'.*/\1/g"`" | 
  awk '{ printf  $1 ;  printf  " "  ; printf  $3 }'
done

Answer 2

After long hours of getting my hands dirty, I chanced to stumble upon this Epic link.

1. Get the MAC address of the VM from the config file of the VM(since I'm using KVM, I queried the .xml file for the MAC address).
2. Then use arp -a and get all the the MAC addresses and the Address of the interfaces and store it in a file
3. Query the file for the MAC address of VM from step 1.