원문 : http://www.ischo.net -- 조인상 //시스템 엔지니어

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#!/bin/ksh
######################################################################################
# script by ischo.
# http://www.ischo.net
# mail:chosim1@naver.com
# script description :
# Send mail to ${MAILADDR} if ${TARGET_SERVER}'s ${SERVER_PORT} port disabled
######################################################################################


# Environment
TARGET_SERVER=x.x.x.x
SERVER_PORT=80
SERVER_NAME=www.ischo.net
MAILADDR=chosim1@naver.com
STIME=`date +%Y%m%d%H%M%S`
MTIME=`date +%H:%M`
DDATE=`date +%Y%m%d`
PROGHOME=/home/admin
LOGFILE=${PROGHOME}/webserver.log
MAILFILE=${PROGHOME}/mail.txt
STATFILE=${PROGHOME}/laststat.txt

if [ ! -f ${STATFILE} ];
then
        echo "0" > ${STATFILE}
fi
cat /dev/null > ${MAILFILE}



# Check Webserver port
telnet ${TARGET_SERVER} ${SERVER_PORT} << !
^]
quit
!

# Sendmail if port disabled
if [ $? -eq 0 ];
then

        if [ `cat ${STATFILE}` -eq $? ];
        then
                echo "${DDATE} ${MTIME}  ${SERVER_NAME}(${TARGET_SERVER}) Webserver Alive" >> ${LOGFILE}
        else
                echo "${DDATE} ${MTIME}  ${SERVER_NAME}(${TARGET_SERVER}) Webserver port ${SERVER_PORT} Recovered." >> ${LOGFILE}
                echo "${DDATE} ${MTIME}  ${SERVER_NAME}(${TARGET_SERVER}) Webserver port ${SERVER_PORT} Recovered." >> ${MAILFILE}
                mail -s "${SERVER_NAME}(${TARGET_SERVER}) Webserver Recover Event!" ${MAILADDR} < ${MAILFILE}
                echo 0 > ${STATFILE}
        fi

else

        if [ `cat ${STATFILE}` -eq $? ];
        then
                echo "${DDATE} ${MTIME}  ${SERVER_NAME}(${TARGET_SERVER}) Webserver Down Detected." >> ${LOGFILE}
                echo "${DDATE} ${MTIME}  ${SERVER_NAME}(${TARGET_SERVER}) Webserver Down Detected." >> ${MAILFILE}
                echo "------------------------------------------------------------" >> ${MAILFILE}
                echo "${SERVER_NAME}(${TARGET_SERVER}) Webserver did not respond from ${SERVER_PORT} port check." >> ${MAILFILE}
                echo "Check ${SERVER_NAME} webserver daemon or OS." >> ${MAILFILE}
                echo "------------------------------------------------------------" >> ${MAILFILE}
                mail -s "${SERVER_NAME}(${TARGET_SERVER}) Webserver Down Event!" ${MAILADDR} < ${MAILFILE}
                echo 1 > ${STATFILE}

        else
                echo "${DDATE} ${MTIME}  ${SERVER_NAME}(${TARGET_SERVER}) Webserver remain Down stat." >> ${LOGFILE}
        fi
fi