sample-ip-reader.sh

rpm -q libguestfs-tools || yum install -y libguestfs-tools

for vm in $(virsh list --all | tail -n +3 | awk ' { print $2 } ') ; do
    virsh start $vm
done

### FIXME: Adjust the wait time according to the number of VMs and how powerful 
### your server is.
echo "Waiting for the vms to power up"
sleep 3m

mkdir -p ~/install-files/ ;

### FIXME: iterates over all RHEL 6 hosts (in my case, all RHEL 6 hosts contain the r6 
### string as part of their name. Replace or remove this accordingly 
for vm in $(virsh list --all | tail -n +3 | grep running | grep r6 | awk ' { print $2 } ') ; do
  echo "Reading last leases from $vm"
  virt-cat $vm /var/lib/dhclient/dhclient-eth1.leases | tail -17 | grep "fixed-address" | sed 's/;//' | awk '{ print $2 }' > /root/install-files/$vm.ip.source
  
  ## Print the new IP
  IP_NEW="$(cat /root/install-files/$vm.ip.source)"
  echo "New IP address is ${IP_NEW}"
done

### FIXME: iterates over all RHEL 6 hosts (in my case, all RHEL 7 hosts contain the r7 
### string as part of their name. Replace or remove this accordingly 
for vm in $(virsh list --all | tail -n +3 | grep running | grep r7 |  awk ' { print $2 } ') ; do
  echo "Reading last leases from $vm"
  leases_file=$(virt-ls $vm /var/lib/NetworkManager/ | grep lease)
  virt-cat $vm /var/lib/NetworkManager/$leases_file | tail -17 | grep "fixed-address" | sed 's/;//' | awk '{ print $2 }' > /root/install-files/$vm.ip.source
  
  ## Print the new IP
  IP_NEW="$(cat /root/install-files/$vm.ip.source)"
  echo "New IP address is ${IP_NEW}"
done