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#!/bin/bash
#----------------------------------------------------
# Version: 0.1.7.0
# Author: Florian "Bluewind" Pritz <f-p@gmx.at>
#
# Copyright (C) 2008-2009 Florian Pritz
#
# Licensed under GNU General Public License v3
# (see COPYING for full license text)
#
#----------------------------------------------------
# Script to check if services are working and take
# actions if not
#----------------------------------------------------
# NOTE:
# Format for service file
# <IP or hostname> <service name>
#-------------------------- CONFIGURATION -----------------------------#
# Time to wait between 2 checks; Shouldn't be lower than 10 as that
# could cause overlap with the timeouts
WAIT=60
# Take action after x faild checks
MAX_FAIL=2
# set to /dev/null if you don't want logs
LOGFILE="$HOME/watchdog.log"
# Paths (Shouldn't need to be changed)
CURL="/usr/bin/curl"
WGET="/usr/bin/wget"
PING="/bin/ping"
#----------------------------------------------------------------------#
SCRIPTNAME=$(basename $0)
EXIT_SUCCESS=0
EXIT_FAILURE=1
EXIT_ERROR=2
EXIT_BUG=10
# Colors for output
red='\e[0;31m'
RED='\e[1;31m'
green='\e[0;32m'
GREEN='\e[1;32m'
blue='\e[0;34m'
BLUE='\e[1;34m'
cyan='\e[0;36m'
CYAN='\e[1;36m'
NC='\e[0m'
function usage {
echo -e "${blue}Usage:${NC} ${SCRIPTNAME} [OPTIONS] [<hostname or IP> <service type>]" >&2
echo -e "Possible service types: http, ping (default)"
echo -e "Options:" >&2
echo -e "-h this help" >&2
echo -e "-f <file> loads IP list from a file" >&2
echo -e "-t <time> Time between 2 checks"
echo -e "-m <tries> Max. fails before taking actions"
[[ $# -eq 1 ]] && exit $1 || exit $EXIT_FAILURE
}
if [ ! -f "$CURL" ]; then
if [ ! -f "$WGET" ]; then
echo -e "${red}Wget doesn't exist!$NC"
exit $EXIT_ERROR
fi
HTTP="$WGET -t 2 -T 1 -O /dev/null"
else
HTTP="$CURL --connect-timeout 1 --retry 2 -O /dev/null"
fi
if [ ! -f "$PING" ]; then
echo -e "${red}Ping command doesn't exist! Please fix the path.$NC"
exit $EXIT_ERROR
else
PING="$PING -c 1 -W 1"
fi
if [ ! "$1" ] && [ ! "$2" ]; then
usage $EXIT_SUCCESS
fi
while getopts ':f:ht:m:' OPTION ; do
case $OPTION in
f)
IPFILE="$OPTARG"
;;
t)
WAIT="$OPTARG"
;;
m)
MAX_FAIL="$OPTARG"
;;
h)
usage $EXIT_SUCCESS
;;
\?)
echo "Unknown option \"-$OPTARG\"." >&2
usage $EXIT_ERROR
;;
:)
echo "Option \"-$OPTARG\" needs an argument" >&2
usage $EXIT_ERROR
;;
*)
echo "This shouldn't happen, please file a bugreport.">&2
usage $EXIT_BUG
;;
esac
done
shift $(( OPTIND - 1 ))
if (( $# > 1 )) ; then
INPUT="$1 $2"
else
INPUT=$(cat $IPFILE)
fi
watcher () {
IP="$1"
TYPE="$2"
case "$TYPE" in
http) COMMAND="$HTTP";;
*) COMMAND="$PING";;
esac
counter=0
while :;
do
precmd_time=$(date +%s)
$COMMAND $IP &> /dev/null
exitcode=$?
if [ "$exitcode" -ne "0" ]; then
if [ "$counter" -lt "1" ]; then
downtime=`date`
fi
let counter=$counter+1
if [ "$counter" -eq $MAX_FAIL ]; then
mail root -s "$IP - $TYPE DOWN! " <<< "$IP - $TYPE is down since $downtime"
fi
else
if [ "$counter" -gt $MAX_FAIL ] || [ "$counter" -eq $MAX_FAIL ]; then
mail root -s "$IP - $TYPE UP! " <<< "$IP - $TYPE is OK again.
Downtime: ${downtime} - $(date)"
echo "$IP - $TYPE Downtime: ${downtime} - $(date)" >> $LOGFILE
fi
counter=0
fi
current_time=$(date +%s)
processing_time=`expr ${current_time} - ${precmd_time}`
sleeptime=`expr ${WAIT} - ${processing_time}`
if [ "${sleeptime}" -lt "1" ]; then
sleeptime=0
fi
sleep ${sleeptime}
done
}
# stops watchers and exits
cleanup() {
kill $jobs &> /dev/null
exit
}
trap cleanup 0 2 15
# start watchers
while read line
do
watcher $line &
done <<< $INPUT
# Prepare killing all watchers
jobs=$(jobs -p)
disown -ar
echo "Press any key to kill"
read -n 1
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