Simple bash script to monitor a webserver on different ports (here smtp, dns, http & https but it can be customized); I’m sure there are over 100 available programs doing this but I wanted something with small memory usage. Also, I only wanted to be notified once, notifications are received by SMS on my cell. With the software I was using before, I

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was getting notified every minute until I could reach a computer and fix the problem or stop monitoring which was quite annoying.

Source : http://blogama.org
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Software installation

You need mail, dig and telnet installed.

 

The script

NOTE : The script will not continue until you do :

./whatever_you_called_this_script fix

This is done on purpose to receive only ONE notification…

#!/bin/bash # Script to check important ports on remote webserver # Copyright (c) 2009 blogama.org # This script is licensed under GNU GPL version 2.0 or above # --------------------------------------------------------------------- ### This script does a verification on port 25, 53, 80 and 443 ### ### After 2 failed check it will send a mail notification ### ######To be modified###### WORKDIR="/root" ###HTTP### HTTPSERVERIP="192.168.1.106" HTTPSERVERPORT="80" ########## ###HTTPS### HTTPSSERVERIP="192.168.1.106" HTTPSSERVERPORT="443" ########## ###MAIL### SMTPSERVERIP="192.168.1.106" SMTPSERVERPORT="25" ########## ###DNS### DNSSERVERIP="192.168.1.106" DOMAINTOCHECKDNS="example.com" ANSWERIP="192.168.1.106" ######### ###NOTIFICATIONS### EMAIL="admin@example.com" ########## ######End to be modified###### ######Do not make modifications below###### ### Binaries ### MAIL=$(which mail) TELNET=$(which telnet) DIG=$(which dig) ###Change dir### cd $WORKDIR ###Restore when problem fix### if [ $1 ]; then if [ $1=="fix" ]; then rm server_problem*.txt exit 1; fi fi ###Check if already notified### if [ -f server_problem.txt ]; then exit 1; fi ###Test SMTP### ( echo "quit" ) | $TELNET $SMTPSERVERIP $SMTPSERVERPORT | grep Connected > /dev/null 2>&1 if [ "$?" -ne "1" ]; then #Ok echo "PORT CONNECTED" if [ -f server_problem_first_time_smtp.txt ]; then #remove file if problem fixed rm -rf server_problem_first_time_smtp.txt fi else #Connection failure if [ -f server_problem_first_time_smtp.txt ]; then #Second time, send notification below echo "SMTP PORT NOT CONNECTING" >> server_problem.txt rm -rf server_problem_first_time_smtp.txt else #First notification > server_problem_first_time_smtp.txt fi fi ###Test HTTP### ( echo "quit" ) | $TELNET $HTTPSERVERIP $HTTPSERVERPORT | grep Connected > /dev/null 2>&1 if [ "$?" -ne "1" ]; then #Ok echo "PORT CONNECTED" if [ -f server_problem_first_time_http.txt ]; then #remove file if problem fixed rm -rf server_problem_first_time_http.txt fi else #Connection failure if [ -f server_problem_first_time_http.txt ]; then #Second time, send notification below echo "HTTP PORT NOT CONNECTING" >> server_problem.txt rm -rf server_problem_first_time_http.txt else #First notification > server_problem_first_time_http.txt fi fi ###Test HTTPS### ( echo "quit" ) | $TELNET $HTTPSSERVERIP $HTTPSSERVERPORT | grep Connected > /dev/null 2>&1 if [ "$?" -ne "1" ]; then #Ok echo "PORT CONNECTED" if [ -f server_problem_first_time_https.txt ]; then #remove file if problem fixed rm -rf server_problem_first_time_https.txt fi else #Connection failure if [ -f server_problem_first_time_https.txt ]; then #Second time, send notification below echo "HTTPS PORT NOT CONNECTING" >> server_problem.txt rm -rf server_problem_first_time_https.txt else #First notification > server_problem_first_time_https.txt fi fi ###Test DNS### $DIG $DOMAINTOCHECKDNS @$DNSSERVERIP | grep $ANSWERIP if [ "$?" -ne "1" ]; then #Ok echo "PORT CONNECTED" if [ -f server_problem_first_time_dns.txt ]; then #remove file if problem fixed rm -rf server_problem_first_time_dns.txt fi else #Connection failure if [ -f server_problem_first_time_dns.txt ]; then #Second time, send notification below echo "DNS PORT NOT CONNECTING" >> server_problem.txt rm -rf server_problem_first_time_dns.txt else #First notification > server_problem_first_time_dns.txt fi fi ###Send mail notification after 2 failed check### if [ -f server_problem.txt ]; then $MAIL -s "Server problem" $EMAIL < /root/server_problem.txt fi

Make it executable:

chmod +x whatever_you_called_this_script

Add it to your crontab:

crontab -e

* * 
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* * * /path/to/whatever_you_called_this_script >/dev/null 2>&1

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