Solved

PID autokill

Posted on 2011-03-22
6
556 Views
Last Modified: 2012-05-11
Hello,

Could somebody help with writing a cron script, that will check all running processes and kill those ones, which cpu usage is above 90% for example?

0
Comment
Question by:tanel
  • 4
  • 2
6 Comments
 
LVL 1

Expert Comment

by:crazyn3wf
ID: 35190208
Try this
#!/bin/bash
#
# Process control
#
# This shell-script watch that <process> doesn't pass the <limit> of % cpu usage
# If it does, the script kills that process and finish
#
# For linux kernel 2.6.x
# v.0.1 sept-2007
#
# Author: Miguel Ángel Molina Molina
# Licence: GPL v.2

# Parameter check
# [debug] parameter is optional and can be anything. If it exists, the script produces output to the screen for debugging purposes.
if [ $# -lt 2 -o $# -gt 3 ];
then
  echo "Usage: `basename $0` <process> <limit> [debug]"
  exit -1
fi

# [debug] exists?
if [ $# -eq 3 ];
then
  debug="yes"
else
  debug=""
fi

procpid=`pidof $1`
typeset -i limit=$2

# process existence check
if [ -z "$procpid" ];
then
  echo "Process: $1 doesn't exists"
  exit -1
fi

# limit check
if [ $limit -lt 1 -o $limit -gt 99 ];
then
  echo "Limit must be between 1 and 99"
  exit -1
fi

typeset -i hits=0

while [ 1 ]
do
  # Get usage cpu time
  typeset -i cputime=`cat /proc/uptime | cut -f1 -d " " | sed 's/\.//'`
  # process pid check

  if [ ! -f /proc/${procpid}/stat ];
  then
    echo "Process doesn't exists: ${procpid}"
    exit -1
  fi
  # Get process usage cpu time
  typeset -i proctime=`cat /proc/${procpid}/stat | awk '{t = $14 + $15;print t}'`
  # wait 5 seconds
  sleep 5
  # get usage cpu time, again
  typeset -i cputime2=`cat /proc/uptime | cut -f1 -d " " | sed 's/\.//'`
  # get process usage cpu time, again
  typeset -i proctime2=`cat /proc/${procpid}/stat | awk '{t = $14 + $15;print t}'`
  # calculate process usage cpu time over total usage cpu time as percentage
  typeset -i cpu=$((($proctime2-$proctime)*100/($cputime2-$cputime)))
  [ ! -z $debug ] && echo "Process $1, with pid: $procpid, is wasting: $cpu% of cpu"
  # limit exceed check
  if [ $cpu -gt $limit ];
  then
    # Count the excess
    let hits+=1
    if [ $hits = 1 ];
    then
      times="time"
    else
      times="times"
    fi
    [ ! -z $debug ] && echo "Process $1 has exceeded the limit: $limit ($cpu) $hits $times ..."
    # If hits are greater than 10, kill the process
    if [ $hits -gt 10 ];
    then
      echo -n "Killing process: $procpid ... "
      kill $procpid
      # wait until process die
      sleep 1
      # check if process has died
      if [ -z "`pidof $1`" ];
      then
        echo "Done."
      else
        echo "Can't kill the process."
      fi
      echo "Finished."
      exit 0
    fi
  else
   # if no limit exceed, reset hit counter
   let hits=0
  fi
done

Open in new window

0
 

Author Comment

by:tanel
ID: 35190539
Thank you, i will test it and let you know!
0
 

Author Comment

by:tanel
ID: 35192880
Sorry, it doesn't seem to work.. How to use it correctly ?
0
Ransomware: The New Cyber Threat & How to Stop It

This infographic explains ransomware, type of malware that blocks access to your files or your systems and holds them hostage until a ransom is paid. It also examines the different types of ransomware and explains what you can do to thwart this sinister online threat.  

 
LVL 1

Accepted Solution

by:
crazyn3wf earned 500 total points
ID: 35193152
ya it desent seem to take the PID correctly, guess i should have tested it before posting.
Try this one. its a little simpler

#!/bin/bash

# March-13-2006
# CPUuse trigger script by Noel
#
# bash code to watch a running program's CPU usage.
# if it's above a set value, it will auto send an email.
# You will need to set a Cron job to run this script every xx minutes
#
# Set some needed things:
#
processToWatch="convert" # in my case I need to watch convert
emailAddress="root@host" # this is my main emailaddress
triggerValue=90 # if the CPU use is above 90% send an email. DO NOT USE a DOT or COMMA!
tempFileName=tmp-cpu # some name of the temp file for the ps, grep data

ps auxww | grep "$processToWatch" | grep -v grep > /tmp/$tempFileName
export LINE
(
read LINE
while [ -n "$LINE" ]
do
set $LINE
read LINE
if [ $(echo "$3" | sed -e 's/\.[0-9]*//g') -gt $triggerValue ]; then
mail -s "CPU message alert for: $processToWatch" $emailAddress <<-END
This is to inform you that the following process: $processToWatch with PID (Process ID) $2 is now using more than your preset $triggerValue value.

Process: $processToWatch is using: $3 of CPU power!
The command used is: $11
END
fi
done
)< /tmp/$tempFileName

Open in new window

0
 

Author Comment

by:tanel
ID: 35196837
Heh, i need the script to kill any procces using much CPU, but this one is just sending mail..
0
 

Author Comment

by:tanel
ID: 35198026
Ok, i have edited the script a little bit and it kills now.
Thanks!
0

Featured Post

U.S. Department of Agriculture and Acronis Access

With the new era of mobile computing, smartphones and tablets, wireless communications and cloud services, the USDA sought to take advantage of a mobilized workforce and the blurring lines between personal and corporate computing resources.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
AWS - HAProxy- KeepAlived 5 51
Why  my code (program) build with old compiler? 11 75
Powershell command 2 37
AWK: Pythagoras bp script 18 27
How to remove superseded packages in windows w60 or w61 installation media (.wim) or online system to prevent unnecessary space. w60 means Windows Vista or Windows Server 2008. w61 means Windows 7 or Windows Server 2008 R2. There are various …
Google Drive is extremely cheap offsite storage, and it's even possible to get extra storage for free for two years.  You can use the free account 15GB, and if you have an Android device..when you install Google Drive for the first time it will give…
Learn several ways to interact with files and get file information from the bash shell. ls lists the contents of a directory: Using the -a flag displays hidden files: Using the -l flag formats the output in a long list: The file command gives us mor…
Connecting to an Amazon Linux EC2 Instance from Windows Using PuTTY.

840 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question