restart process based on file

e-l-diablo · #1 (**permalink**) 07-21-2009

Hi all.
I do have a script "startApp.sh" (app result is a file /opt/extract/appextract.txt)

I have no problems with stopping app

Code:

var1=`ps -ef | grep -v grep | grep MyApp | awk '{print $2}'`
kill -9 $var1

What I want to achieve is:

I start app, app is doing some extraction, after extraction is done i would like to stop app (kill app if/when) wait some time (~ 30 sec. different processes/scripts taking place) and start app again (until next extract)

I will try to be more schematic
- start App
- app is running, doing stuff, and creates a file
- when file is created I have to stopApp
- wait ~30sec
- start app

Could you please guide me how to create some script that will be in "constant loop" or a service and will watch for that file, if exist do somethinh (kill my app)

thank you very much
e-l-diablo

Use CODE-tags when displaying code, data or logs to enhance readability and to preserve formatting like indention etc., ty.

zaxxon · #2 (**permalink**) 07-21-2009

Script could look like:

Code:

#!/bin/sh

./app start

while :; do
     sleep 1 # just to give it short breaks
     if [[ -e /<path-to-your-output-file>/filename ]]; then
          ./app stop
          sleep 30
          break
     fi
done

./app start

exit 0

e-l-diablo · #3 (**permalink**) 07-21-2009

perfect.
Wht I dod not think about that.
That is what I was searching for. I will give a try and let you know if it works as it should (there are more scripts in that process)
very, very much thank you (i will do some modifications, i already see some options)

e-l-diablo · #4 (**permalink**) 08-12-2009

Hi again. After testing it does not work

What i have done:
I have script called startMe.sh. It starts app and should kill when file in specific directory exists.

Code:

#!/bin/sh
rm /opt/tmp/restart.txt *that removes restart file if exist

./startApp.sh

while :; do
     if [[ -e /opt/tmp/restart.txt ]]; then
          ./killapp.sh
          sleep 30
          break
     fi
done

./startApp.sh
exit 0

killapp.sh looks like

Code:

var1=`ps -ef | grep -v grep | grep java | grep username | awk '{print $2}'`
kill -9 $var1

Where am i doing something wrong?

zaxxon · #5 (**permalink**) 08-12-2009

No idea if this is a typo:

Code:

... *that removes restart file if exist

Comments should start with a # nor a *.

Is ./startApp.sh touching that flag file?
Also what is not working? A bit more details could help, ty.

e-l-diablo · #6 (**permalink**) 08-12-2009

Hi.

Code:

*that removes restart file if exist

That was FYI
Few more details. I am running Solaris 10 on SUN x4450 box (really nice work horse) with 128GB RAM.
when I run ./startApp.sh all works as it should: my application starts
and i get messages (all the time)

Code:

./startApp.sh: [[: not found
./startApp.sh: [[: not found
./startApp.sh: [[: not found
./startApp.sh: [[: not found
./startApp.sh: [[: not found
./startApp.sh: [[: not found
./startApp.sh: [[: not found
./startApp.sh: [[: not found
./startApp.sh: [[: not found
./startApp.sh: [[: not found
./startApp.sh: [[: not found
./startApp.sh: [[: not found
./startApp.sh: [[: not found
./startApp.sh: [[: not found

when i place killapp.txt under /opt/tmp nothing, just nothing. That is strange becaus in theory should work.

zaxxon · #7 (**permalink**) 08-12-2009

So your script ./startApp.sh seems to have a problem.

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