Bash script to check url status

There are many instances where a administrator needs to check the status of application url from time to time to ensure all applications deployed on server is running fine. Below script is designed to do exactly same, and it helps a lot when you have a huge number of application urls which needs to be checked from time to time. Below bash script to check url status can be used as a script to check url availability.

This script contains 3 files:

urllist: File to store application urls one by one.

Example urllist” file Needs to be created in the same directory where script will reside:

http://www.google.com
http://www.yahoo.com

ScriptMonitor.log: This is the log file generated on the same directory where script is ran. It contains all status of urls checked.

CheckURL.sh : The bash script which will be used to check the application URL’s.

Contents/Variables Desc. Inside Script in Functions:

SetParam() : Contains all the variables which needs to be set in script.

URL_Status() : Main function which calculates the RESPONSE CODES

Mail_Admin() : Sends mail to admin mailing list incase of server down issue.

Send_Log() : Sends all logs generated by the script to admin mailing list.

Main_Menu() : Used to call all functions

tee Command: Used to record the logs.

curl Command: Used to get the status codes.

 

 

 

 

 

 

#!/bin/bash
#bash to check url status.
#set -x; # Enable this to enable debug mode.
#clear # Enable this to clear your screen after each run.

SetParam() {
export URLFILE="urllist"
export TIME=`date +%d-%m-%Y_%H.%M.%S`
SAFE_STATUSCODES=( 200 201 202 203 204 205 206 207 208 226 401 )
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 SCRIPT_LOG="Script_Monitor.log"
}

URL_Status() {

SetParam
sed -i '/^$/d' $URLFILE; #To Parse the URLFILE for removal of blank rows
cat $URLFILE | while read next
do
STATUS_CODE=`curl --output /dev/null --silent --head --write-out '%{http_code}\n' $next`
# If you want to set a timeout then add --max-time 15, here 15 is 15seconds
case $STATUS_CODE in

100) echo "At $TIME: $next url status returned $STATUS_CODE : Continue" ;;
101) echo "At $TIME: $next url status returned $STATUS_CODE : Switching Protocols" ;;
102) echo "At $TIME: $next url status returned $STATUS_CODE : Processing (WebDAV) (RFC 2518) " ;;
103) echo "At $TIME: $next url status returned $STATUS_CODE : Checkpoint" ;;
122) echo "At $TIME: $next url status returned $STATUS_CODE : Request-URI too long" ;;
200) echo "At $TIME: $next url status returned $STATUS_CODE : OK" ;;
201) echo "At $TIME: $next url status returned $STATUS_CODE : Created" ;;
202) echo "At $TIME: $next url status returned $STATUS_CODE : Accepted" ;;
203) echo "At $TIME: $next url status returned $STATUS_CODE : Non-Authoritative Information" ;;
204) echo "At $TIME: $next url status returned $STATUS_CODE : No Content" ;;
205) echo "At $TIME: $next url status returned $STATUS_CODE : Reset Content" ;;
206) echo "At $TIME: $next url status returned $STATUS_CODE : Partial Content" ;;
207) echo "At $TIME: $next url status returned $STATUS_CODE : Multi-Status (WebDAV) (RFC 4918) " ;;
208) echo "At $TIME: $next url status returned $STATUS_CODE : Already Reported (WebDAV) (RFC 5842) " ;;
226) echo "At $TIME: $next url status returned $STATUS_CODE : IM Used (RFC 3229) " ;;
300) echo "At $TIME: $next url status returned $STATUS_CODE : Multiple Choices" ;;
301) echo "At $TIME: $next url status returned $STATUS_CODE : Moved Permanently" ;;
302) echo "At $TIME: $next url status returned $STATUS_CODE : Found" ;;
303) echo "At $TIME: $next url status returned $STATUS_CODE : See Other" ;;
304) echo "At $TIME: $next url status returned $STATUS_CODE : Not Modified" ;;
305) echo "At $TIME: $next url status returned $STATUS_CODE : Use Proxy" ;;
306) echo "At $TIME: $next url status returned $STATUS_CODE : Switch Proxy" ;;
307) echo "At $TIME: $next url status returned $STATUS_CODE : Temporary Redirect (since HTTP/1.1)" ;;
308) echo "At $TIME: $next url status returned $STATUS_CODE : Resume Incomplete" ;;
400) echo "At $TIME: $next url status returned $STATUS_CODE : Bad Request" ;;
401) echo "At $TIME: $next url status returned $STATUS_CODE : Unauthorized" ;;
402) echo "At $TIME: $next url status returned $STATUS_CODE : Payment Required" ;;
403) echo "At $TIME: $next url status returned $STATUS_CODE : Forbidden" ;;
404) echo "At $TIME: $next url status returned $STATUS_CODE : Not Found" ;;
405) echo "At $TIME: $next url status returned $STATUS_CODE : Method Not Allowed" ;;
406) echo "At $TIME: $next url status returned $STATUS_CODE : Not Acceptable" ;;
407) echo "At $TIME: $next url status returned $STATUS_CODE : Proxy Authentication Required" ;;
408) echo "At $TIME: $next url status returned $STATUS_CODE : Request Timeout" ;;
409) echo "At $TIME: $next url status returned $STATUS_CODE : Conflict" ;;
410) echo "At $TIME: $next url status returned $STATUS_CODE : Gone" ;;
411) echo "At $TIME: $next url status returned $STATUS_CODE : Length Required" ;;
412) echo "At $TIME: $next url status returned $STATUS_CODE : Precondition Failed" ;;
413) echo "At $TIME: $next url status returned $STATUS_CODE : Request Entity Too Large" ;;
414) echo "At $TIME: $next url status returned $STATUS_CODE : Request-URI Too Long" ;;
415) echo "At $TIME: $next url status returned $STATUS_CODE : Unsupported Media Type" ;;
416) echo "At $TIME: $next url status returned $STATUS_CODE : Requested Range Not Satisfiable" ;;
417) echo "At $TIME: $next url status returned $STATUS_CODE : Expectation Failed" ;;
500) echo "At $TIME: $next url status returned $STATUS_CODE : Internal Server Error" ;;
501) echo "At $TIME: $next url status returned $STATUS_CODE : Not Implemented" ;;
502) echo "At $TIME: $next url status returned $STATUS_CODE : Bad Gateway" ;;
503) echo "At $TIME: $next url status returned $STATUS_CODE : Service Unavailable" ;;
504) echo "At $TIME: $next url status returned $STATUS_CODE : Gateway Timeout" ;;
505) echo "At $TIME: $next url status returned $STATUS_CODE : HTTP Version Not Supported" ;;
esac

URL_SafeStatus $STATUS_CODE

done;

}

URL_SafeStatus() {
flag=0
for safestatus in ${SAFE_STATUSCODES[@]}
do
#echo "got Value of STATUS CODE= $1";
#echo "Reading Safe Code= $safestatus";
if [ $1 -eq $safestatus ] ; then

echo "At $TIME: Status Of  URL $next = $STATUS_UP";
flag=1
break;
fi
done

if [ $flag -ne 1 ] ; then
echo "At $TIME: Status Of  URL $next = $STATUS_DOWN" | Mail_Admin $TIME $next
#break;
fi

}

Mail_Admin() {
SetParam
echo "At $1 URL $2 is DOWN!!" | mailx -s " Application URL: $2 DOWN!!!" $MAIL_TO
}

Send_Log() {
SetParam
if [ -f $SCRIPT_LOG ] ; then
mailx -s "$0 Script All Url Check Log Details Till $TIME" $MAIL_TO < $SCRIPT_LOG
else
echo "$SCRIPT_LOG NOT FOUND!!"
fi
}

Main_Menu() {

URL_Status

}
SetParam
Main_Menu | tee -a $SCRIPT_LOG
Send_Log

 

After Running the script with above urllist the output will look like below. And It will send a mail to the MAIL_TO list incase any url found down or status code does not come in the safe list defined in SetParam function.

Note: Edited MAIL_TO due to bombardment of test emails from users :). See my comment.

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