get_vms_ip.tmpl

#!/bin/bash

# GC project will be filled in by create_haproxy_lb.sh
PROJECT=_PROJECT_

# GKE cluster VM's name will be filled in by create_haproxy_lb.sh
SERVERS=_SERVERS_

#
gcloud=/usr/bin/gcloud

#
sudo cp -f /opt/haproxy/haproxy.cfg.template /opt/haproxy/haproxy.cfg

for machine in $($gcloud compute instances list --project=$PROJECT | grep -v grep | grep $SERVERS | grep -v 'int-lb' | awk {'print $4'}); do
    sudo echo "    server node-$machine $machine:80 check" >> /opt/haproxy/haproxy.cfg
done

# check if config files do not match
if [ "$(diff /etc/haproxy/haproxy.cfg /opt/haproxy/haproxy.cfg | tr -d '\n' | cut -c1-4 )" != "" ]
then
  echo "Updating /etc/haproxy/haproxy.cfg !!!"
  sudo cp -fr /opt/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg
  echo "Restarting haproxy !!!"
  sudo systemctl restart haproxy.service
fi