req: Bash / Script to auto kill PID if it's needed....

Hello nice people from HowtoForge

I'm really in need of a script (bash will do) to kill a PID/USER when it's taking 99% of %CPU power for over a set time!

I was looking of a way of doing this with some use of top

When running top like this: top -1 -n 1 -b -u coldfusion it will show only the Coldfusion PID/USER once.
The PID/USER that is taking 99% of cpu power will also sit at the top of the list.

(as you can see, the PID 2934 (user coldfusi) is taking with the command convert over 99% of CPU pwrd)

What I'm after is some script (bash?) that I can run on a cron job every 5 / 10 minutes to see if coldfusi with the command convert is sitting at or over 99%, and if so to auto kill the PID!

Anyone here who can help/show me how to make this?

Thank you...

Noel

 

You could parse the output of

Code:

ps aux

 

falko.. you again .. you are my nr1 person here

The ps aux does look a usable tool..
The only thing is that I can not find a way to sort the result by CPU use.

Code:

********* simple selection *********  ********* selection by list *********
-A all processes                      -C by command name
-N negate selection                   -G by real group ID (supports names)
-a all w/ tty except session leaders  -U by real user ID (supports names)
-d all except session leaders         -g by session OR by effective group name
-e all processes                      -p by process ID
T  all processes on this terminal     -s processes in the sessions given
a  all w/ tty, including other users  -t by tty
g  OBSOLETE -- DO NOT USE             -u by effective user ID (supports names)
r  only running processes             U  processes for specified users
x  processes w/o controlling ttys     t  by tty
*********** output format **********  *********** long options ***********
-o,o user-defined  -f full            --Group --User --pid --cols --ppid
-j,j job control   s  signal          --group --user --sid --rows --info
-O,O preloaded -o  v  virtual memory  --cumulative --format --deselect
-l,l long          u  user-oriented   --sort --tty --forest --version
-F   extra full    X  registers       --heading --no-heading --context
                    ********* misc options *********
-V,V  show version      L  list format codes  f  ASCII art forest
-m,m,-L,-T,H  threads   S  children in sum    -y change -l format
-M,Z  security data     c  true command name  -c scheduling class
-w,w  wide output       n  numeric WCHAN,UID  -H process hierarchy

It does not really give a 'sort by CPU use' option... Is there a hidden option for this?

 

Why don't you use something like

Code:

ps aux|grep coldfusion|grep -v grep

to find all processes related to coldfusion?

 

Okay.. getting close now..

I found some bash code that might do the trick for me..
Only problem.. I'm getting a syntax error: unexpected end of file (on line 16)

The code will dump the 'ps auxww' output for 'convert' in a file named 'rmp-grep'
Than it will read and 'grep' the file. If $2 is greater than (in this example) 20 it should show BAD Process found

Some one here (falko) who can have a look and let me know why it's giving the 'unexpected end of file' error?

** edit..
When it does find the process and when it's above 20% it will give this error:
./test: line 10: [: 0.0: integer expression expected (I've named the script as 'test' for now)

Thank you

Code:

#!/bin/bash
#
ps auxww | grep "cfmx7" | grep -v grep | cut -c10-14,15-20,61- > tmp-grep
export LINE
(
read LINE
while [ -n "$LINE" ]
do
        set $LINE
        if [ $2 -gt 20 ]; then
                echo "BAD Process found";
                EOF
        fi
        read LINE
done
)< tmp-grep

 

Okay.. I got it

The scrip will email me when cfmx7 is using more than 90% CPU pwr

Code:

#!/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

 

Looks good!

 

Thanks falko..
For sure the code can be made better, but for now it will do.
(I started coding in bash 2 days ago)

Bash looks like a fun language to use.. I'm going to read some more things about it.

 

This is a good starting point: http://www.tldp.org/LDP/abs/html/index.html