Bash Script To Ping And Telnet multiple hosts

Few times in administrative jobs we need to make sure some services or ports are always open and listening to monitor the same we can use below script can be used to ping and telnet to different hosts running on different ports. This bash script to ping multiple hosts can be used also to  telnet multiple hosts.

Things required:

Host_PortFile.txt – This file contains all the host names and port numbers needs to be pinged and telnet. Put your host names and ports like below and save it.

techpaste.com:80
yahoo.com:80
google.com:443
gmail.com:443
noerror.com:81

Below is the bash script:

#!/bin/bash
#bash to check ping and telnet status.
#set -x;
#
#clear
SetParam() {
export URLFILE="Host_PortFile.txt"
export TIME=`date +%d-%m-%Y_%H.%M.%S`
export port=80
export STATUS_UP=`echo -e "\E[32m[ RUNNING ]\E[0m"`
export STATUS_DOWN=`echo -e "\E[31m[ DOWN ]\E[0m"`
export MAIL_TO="admin(at)techpaste(dot)com"
export SHELL_LOG="`basename $0`.log"
}

Ping_Hosts() {

SetParam
cat $URLFILE | while read next
do

server=`echo $next | cut -d : -f1`

ping -i 2 -c 6 $server > /dev/null 2>&1

if [ $? -eq 0 ] ; then
echo "$TIME : Status Of Host $server = $STATUS_UP";
else
echo "$TIME : Status Of Host $server = $STATUS_DOWN";
echo "$TIME : Status Of Host $server = $STATUS_DOWN" | mailx -s "$server Host DOWN!!!" $MAIL_TO

fi
done;
}

Telnet_Status() {

SetParam

cat $URLFILE | while read next
do

server=`echo $next | cut -d : -f1`
port=`echo $next | awk -F":" '{print $2}'`

TELNETCOUNT=`sleep 5 | telnet $server $port | grep -v "Connection refused" | grep "Connected to" | grep -v grep | wc -l`

if [ $TELNETCOUNT -eq 1 ] ; then

echo -e "$TIME : Port $port of URL http://$server:$port/ is \E[32m[ OPEN ]\E[0m";
else
echo -e "$TIME : Port $port of URL http://$server:$port/ is \E[31m[ NOT OPEN ]\E[0m";
echo -e "$TIME : Port $port of URL http://$server:$port/ is NOT OPEN" | mailx -s "Port $port of URL $server:$port/ is DOWN!!!" $MAIL_TO;

fi
done;
}
Main() {
Ping_Hosts
Telnet_Status
}
SetParam
Main | tee -a $SHELL_LOG

Above script will create a log with the script name like if the shell script is stored as shell.sh then the log name for this script will be shell.log, once you run the script. A sample output is given below

Thanks to Fr3dY for a new script which can also be used for the same tasks like ping, telnet and curl. Please check out this comment for the script

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