47 lines
1.3 KiB
Bash
47 lines
1.3 KiB
Bash
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#!/usr/bin/env bash
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# Copyright (C) 2021 by LHProjects <copyright@lhpmail.us>
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#
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# 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.
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#
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#
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# Monitors host public IP, when it differs, restart services.
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#
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#
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# I wrote this script for services like Nginx, which caches hostnames and fall out of sync when hostname IP changes.
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# This is problematic when you have edge servers connecting to backends with hostnames that change
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# ips frequently.
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# Define variables
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CONF_NAME="monitor_ip.conf"
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POSSIBLE_PATHS="./ /etc"
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CACHE_IP_FILE=/tmp/monitor_ip.cache
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PUBLIC_IP=$(curl --silent https://api.ipify.org/)
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FOUND=false
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IFS=" "
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for P in $POSSIBLE_PATHS; do
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if test -f "$P"/$CONF_NAME; then
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FOUND=true
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source "$P"/$CONF_NAME
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fi
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done
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if [ $FOUND = false ]; then
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echo "Configuration file not found in '$POSSIBLE_PATHS'"
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exit 1
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fi
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# Check if we have cache IP
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if test -f $CACHE_IP_FILE; then
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CACHE_IP=$(cat $CACHE_IP_FILE)
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if [ "$PUBLIC_IP" != "$CACHE_IP" ]; then
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for S in $SERVICES; do
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systemctl restart "$S"
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done
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fi
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else
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echo "$PUBLIC_IP" > $CACHE_IP_FILE
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fi
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exit 0
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