Script to test for scripts running

runnerpaul · #1 (**permalink**) 08-13-2008

Hi,

Im writing a script that will check which scripts are running. The script will run on a 5min loop and the status of the scripts will be written to the log. If any of the scripts arent running an email will be sent out.

At the min if all scripts are running an entry is made to the log saying so. If any are down an entry is made to the log saying tis and an email is sent out.

The problem is that the email sent out just sends out the name of the last script in AllScripts.txt(even if it is not down). I wish to have the script compare which scripts are not running against the list in my file and include these scripts in the email.

Ideally I would also like to list the scripts that are down in my log but I figure if I can get one working I'll be able to do the other.

Any info/help would be appreciated cos I have hit a bit of a block.

Heres what I got so far:-

chk_scripts.sh:

Code:

log() {
    /usr/bin/echo "$1" >> ${LOGFILE}
}

checkstatus(){
   serverName=`grep $i $confFile|sed 's/^[   ]*\([^=  ]*\)[=    ].*$/\1/g'`
   pid=`ps -efa | grep $serverName|grep -v 'grep '|sed 's/^[^0-9]*\([0-9]*\)[^0-9].*$/\1/'`
   if [ "$pid" = "" ]
   then
      srvr_status="N"
   else
      srvr_status="Y"
   fi
}
ChkScript(){
 confFile="/var/tmp/Paul/scripts/AllScripts.txt"
 for i in `cat $confFile`
  do
     myScript=`echo $i|sed 's/^[   ]*\([^=  ]*\)[=    ].*$/\1/g'`
     checkstatus
     if [ $srvr_status="N" ]
     then
        ScriptList="$myScript "
     fi
  done
     #log "ERROR : $ScriptList not Running !!!!"
     if [ $mail_count -le 10 ]
        then
        echo "$ScriptList not running!!!!" | /usr/lib/sendmail paul@me.com
        mail_count=`expr $mail_count + 1`
     fi
}
##################################################################
LOGFILE=/var/tmp/Paul/scripts/chk_myscripts.log
SCRIPTNAME="chk"
mail_count=0
while true
do
  ScriptList=""
  lpaprocess=`ps -efa |grep $SCRIPTNAME |grep -v 'grep ' |wc -l`
  if [ $lpaprocess -eq 4 ]
 then
     mail_count=0
     log "All CHK Scripts Running"
  elif [$lpaprocess -lt 4 ]
 then
  log "CHK script not running!!!!"
  #ProcList="FAL"
  ChkScript
  fi
 sleep 300
done
fi

AllScripts.txt:

Code:

/var/opt/moto/live/scripts/chk_pending.sh
/var/opt/moto/live/scripts/chk_process.sh
/var/opt/moto/live/scripts/chk_log_test1.sh
/var/opt/moto/live/scripts/chk_log_test2.sh

Cheers
Paul

broli · #2 (**permalink**) 08-13-2008

i know is not the perfect answer, but i think you better check out hobbit script for procs
it does exactly what you want, even better, you could use the client
The Hobbit Monitor

runnerpaul · #3 (**permalink**) 08-14-2008

Cheers. Im trying to learn how to script so am keen to get this working.

Thanks for the pointer though.

broli · #4 (**permalink**) 08-14-2008

fair enough.
i think you are over working with that script.

i would do like this (psudo code)

Code:

make a full ps and save it to a temp file.
for each line in the AllScripts.txt file
      grep the line we just read in the ps output
      if we found it
            send some ok or just do nothing
      if we dont find it
            mail -s we are under atack superman@gmail.com

for how actually do all that stuff. well, i can think of these

PS
ps -whatevarOptionsForYourUnix > /tmp/tempile

"for each line" <-- i would use a rediction to a while

Code:

while read line
do
    echo "line is a var wich contains one single line read fomr the file, including newline"
    echo " this is $line"
done < /var/tmp/Paul/scripts/AllScripts.txt

i think im in love with the "feeding from below" thingy :P

"grep the line"
just use grep $line /tmp/tempfile

"if we found it"
check for greps erturn code. i think that goes liek this
0 - grep found at least something
1= grep did not find anything
and you check if with
if [ $? -eq 0 ]
$? holds the return code of the last program/subshell spawned
-eq is an option for test that is read "equals" and aplies to integers

that would be the basic skeleton.
the decicion structures and stuff.
you can read alot more about bash and scripting here.
(¡including test, internal bash variables, and redictions)
Advanced Bash-Scripting Guide

runnerpaul · #5 (**permalink**) 08-14-2008

Cheers. Im looking into that.
At the min im writing my grep to output to a tmp file. I can get this working but includes my actual grep in the output too. I know -v is used to hide the grep but not sure how it should look in a script. Heres what I got:

Code:

ps -efa | grep chk > /var/tmp/Paul/scripts/tmp

I have tried:

Code:

`ps -efa | grep chk -v > /var/tmp/Paul/scripts/tmp`

and:

Code:

`ps -efa | grep chk | grep -v 'grep '` > /var/tmp/Paul/scripts/tmp

Both created an empty tmp file.

Got any suggestions?

By the way, thanks for all the help so far.

broli · #6 (**permalink**) 08-14-2008

Quote:

Originally Posted by runnerpaul

Cheers. Im looking into that.
At the min im writing my grep to output to a tmp file. I can get this working but includes my actual grep in the output too. I know -v is used to hide the grep but not sure how it should look in a script. Heres what I got:

Code:

ps -efa | grep chk > /var/tmp/Paul/scripts/tmp

why you grep for chk?

Quote:

Originally Posted by runnerpaul

I have tried:

Code:

`ps -efa | grep chk -v > /var/tmp/Paul/scripts/tmp`

ofcorse, the way to doit is how you did it next

Quote:

Originally Posted by runnerpaul

and:

Code:

`ps -efa | grep chk | grep -v 'grep '` > /var/tmp/Paul/scripts/tmp

Both created an empty tmp file.

Got any suggestions?

ig the first grep donst find chk, then the second one is taking out the only match.

Quote:

Originally Posted by runnerpaul

By the way, thanks for all the help so far.

no problem

era · #7 (**permalink**) 08-15-2008

Are you really using backticks in those commands? Take them out, they don't do what you want.

As an aside, the customary way to avoid a Useless Use of Grep is to grep for a regex which doesn't match itself.

Code:

ps -efa | grep '[c]hk' >/path/to/tempfile

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