From a0ab07359ecc6e1cf8f12a2516f8b47cad50a2f0 Mon Sep 17 00:00:00 2001
From: Lutchy Horace <bugzbunny@lhpmail.us>
Date: Tue, 26 Oct 2021 08:10:32 -0400
Subject: [PATCH] First Draft and should close this MR

---
 monitor_ip.conf.example |  6 ++++++
 monitor_ip.sh           | 47 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)
 create mode 100644 monitor_ip.conf.example
 create mode 100644 monitor_ip.sh

diff --git a/monitor_ip.conf.example b/monitor_ip.conf.example
new file mode 100644
index 0000000..43562ef
--- /dev/null
+++ b/monitor_ip.conf.example
@@ -0,0 +1,6 @@
+#
+# Configuration file for monitor_ip.sh
+#
+#
+
+SERVICES="nginx"
\ No newline at end of file
diff --git a/monitor_ip.sh b/monitor_ip.sh
new file mode 100644
index 0000000..ea60e17
--- /dev/null
+++ b/monitor_ip.sh
@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+
+# Copyright (C) 2021 by LHProjects <copyright@lhpmail.us>
+#
+# Permission is granted to use, copy, modify, and/or distribute this work for any purpose with or without fee. This work is offered as-is, with absolutely no warranty whatsoever. The author is not responsible for any damages that result from using this work. 
+#
+#
+
+# Monitors host public IP, when it differs, restart services.
+#
+#
+# I wrote this script for services like Nginx, which caches hostnames and fall out of sync when hostname IP changes.
+# This is problematic when you have edge servers connecting to backends with hostnames that change
+# ips frequently.
+
+# Define variables
+CONF_NAME="monitor_ip.conf"
+POSSIBLE_PATHS="./ /etc"
+CACHE_IP_FILE=/tmp/monitor_ip.cache
+PUBLIC_IP=$(curl --silent https://api.ipify.org/)
+
+FOUND=false
+IFS=" "
+for P in $POSSIBLE_PATHS; do
+	if test -f "$P"/$CONF_NAME; then
+		FOUND=true
+		source "$P"/$CONF_NAME
+	fi
+done
+
+if [ $FOUND = false ]; then
+	echo "Configuration file not found in '$POSSIBLE_PATHS'"
+	exit 1
+fi
+
+# Check if we have cache IP
+if test -f $CACHE_IP_FILE; then
+	CACHE_IP=$(cat $CACHE_IP_FILE)
+	if [ "$PUBLIC_IP" != "$CACHE_IP" ]; then
+		for S in $SERVICES; do
+			systemctl restart "$S"
+		done
+	fi
+else
+	echo "$PUBLIC_IP" > $CACHE_IP_FILE
+fi
+exit 0
\ No newline at end of file