Shell Script to find out if a process is running on any all machines
Hi All, I have been a guest visitor from a long time and this forum is wonderful. I finally am a member of this forum too, so i am here stuck with a shell script that i was trying to write
My requirement is that i should be able to create a shell script which will check if a process is running on this machine and any other machines too i.e if i am trying to start a app on server3 it should first check if the app is already started on server1 and server2 if not then it should start this app on server3 else it should exit.
I tried using the script to create lock file to do the same but was not sure if that would, for an idea i will post that script here. please help me out guys, thank you!!!
Code:
CreateLockFile () {
unset PROCESS_ID
unset ID
LFILE=${TEMP_PATH}/${1}_${TODAYS_DATE}.LCK
ID=$2
if [ -r ${LFILE} ]
then
OPID=`cat ${LFILE}` 2> /dev/null
if [ -z ${OPID} -eq 0 ] #Make Sure OPID contains a value
then
exit ${FAILURE} "ERROR-APP-->: `basename ${LFILE}` exists but contains no
Process ID" | tee -a ${INLOG}
else
PROCESS_ID=`ps -p ${OPID} | grep ADD-SCRIPT-NAME-HERE | awk -F" " '{print $1}'
2> /dev/null`
if [ ${PROCESS_ID} ] #Lock File is there, check if process is actually
running
then
echo "WARNING-->: ${1} Script Is Currently Running [PID=${OPID}], Exiting.
${DATE_TIME}" | tee -a ${INLOG}
exit ${SUCCESS}
else
echo "INFO-->: Old Lock File with PID= [ ${OPID} ] Exists But Process Is Not
Running. " >> ${INLOG}
echo "INFO-->: Overwriting Old PID with New PID Value of [ ${ID} ] " >>
${INLOG}
echo "$ID" > ${LFILE}
fi
fi
else
echo "$ID" > ${LFILE}
if [ $? -ne 0 ]
then
exit ${FAILURE} "ERROR-APP-->: Could Not Create Lock File - Exiting " | tee -a
${INLOG}
fi
fi
}
Moderator's Comments:
Use code tags please, thanks.
Last edited by zaxxon; 02-14-2013 at 10:09 AM..
Reason: code tags
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Discussion started by: manas_1988
8 Replies
LEARN ABOUT DEBIAN
shlock
SHLOCK(1) General Commands Manual SHLOCK(1)NAME
shlock - create lock files for use in shell scripts
SYNOPSIS
shlock -p pid -f name [ -b ] [ -u ] [ -c ]
DESCRIPTION
Shlock tries to create a lock file named name and write the process ID pid into it. If the file already exists, shlock will read the
process ID from the file and test to see if the process is currently running. If the process exists, then the file will not be created.
Shlock exits with a zero status if it was able to create the lock file, or non-zero if the file refers to currently-active process.
OPTIONS -b Process IDs are normally read and written in ASCII. If the ``-b'' flag is used, then they will be written as a binary int. For
compatibility with other systems, the ``-u'' flag is accepted as a synonym for ``-b'' since binary locks are used by many UUCP pack-
ages.
-c If the ``-c'' flag is used, then shlock will not create a lock file, but will instead use the file to see if the lock is held by
another program. If the lock is valid, the program will exit with a non-zero status; if the lock is not valid (i.e., invoking
shlock without the flag would have succeeded), then the program will exit with a zero status.
EXAMPLES
The following example shows how shlock would be used within a shell script:
LOCK=/var/run/innd/LOCK.send
trap 'rm -f ${LOCK} ; exit 1' 1 2 3 15
if shlock -p $$ -f ${LOCK} ; then
# Do appropriate work
else
echo Locked by `cat ${LOCK}`
fi
HISTORY
Written by Rich $alz <rsalz@uunet.uu.net> after a description of HDB UUCP locking given by Peter Honeyman. This is revision 1.9, dated
1996/10/29.
SHLOCK(1)
02-14-2013
