Linux Shell Script For Process Monitoring

Shell Script For Process Monitoring

提问by Tobis

This

This

#!/bin/bash
if [ `ps -ef | grep "91.34.124.35" | grep -v grep | wc -l` -eq 0 ]; then sh home/asfd.sh; fi

or this?

or this?

ps -ef | grep "91\.34\.124\.35" | grep -v grep > /dev/null
if [  "$?" -ne "0" ]
then
sh home/asfd.sh
else
echo "Process is running fine"
fi

Hello, how can I write a shell script that looks in running processes and if there isn't a process name CONTAINING91.34.124.35 then execute a file in a certain place and I want to make this run every 30 seconds in a continuous loop, I think there was a sleep command.

Hello, how can I write a shell script that looks in running processes and if there isn't a process name CONTAINING91.34.124.35 then execute a file in a certain place and I want to make this run every 30 seconds in a continuous loop, I think there was a sleep command.

回答by Kheldar

Use cron for the "loop every 30 seconds" part.

Use cron for the "loop every 30 seconds" part.

回答by roymustang86

Either way is fine, you can save it in a .sh file and add it to the crontab to run every 30 seconds. Let me know if you want to know how to use crontab.

Either way is fine, you can save it in a .sh file and add it to the crontab to run every 30 seconds. Let me know if you want to know how to use crontab.

回答by Benoit

Try this:

Try this:

if ps -ef | grep "91\.34\.124\.35" | grep -v grep > /dev/null
then
    sh home/asfd.sh
else
    echo "Process is running fine"
fi

No need to use test. ifitself will examine the exit code.

No need to use test. ifitself will examine the exit code.

回答by Matteo

you can't use cron since on the implementation I know the smallest unit is one minute. You can use sleep but then your process will always be running (with cron it will started every time).

you can't use cron since on the implementation I know the smallest unit is one minute. You can use sleep but then your process will always be running (with cron it will started every time).

To use sleep just

To use sleep just

while true ; do
  if ! pgrep -f '91\.34\.124\.35' > /dev/null ; then
    sh /home/asfd.sh
  fi
  sleep 30
done

If your pgrephas the option -qto suppress output (as on BSD) you can also use pgrep -qwithout redirecting the output to /dev/null

If your pgrephas the option -qto suppress output (as on BSD) you can also use pgrep -qwithout redirecting the output to /dev/null

回答by Shawn Chin

First of all, you should be able to reduce your script to simply

First of all, you should be able to reduce your script to simply

if ! pgrep "91\.34\.124\.35" > /dev/null; then ./your_script.sh; fi

To run this every 30 seconds via cron (because cron only runs every minute) you need 2 entries - one to run the command, another to delay for 30 seconds before running the same command again. For example:

To run this every 30 seconds via cron (because cron only runs every minute) you need 2 entries - one to run the command, another to delay for 30 seconds before running the same command again. For example:

* * * * * root if ! pgrep "91\.34\.124\.35" > /dev/null; then ./your_script.sh; fi
* * * * * root sleep 30; if ! pgrep "91\.34\.124\.35" > /dev/null; then ./your_script.sh; fi

To make this cleaner, you might be able to first store the command in a variable and use it for both entries. (I haven't tested this).

To make this cleaner, you might be able to first store the command in a variable and use it for both entries. (I haven't tested this).

CHECK_COMMAND="if ! pgrep '91\.34\.124\.35' > /dev/null; then ./your_script.sh; fi"

* * * * * root eval "$CHECK_COMMAND"
* * * * * root sleep 30; eval "$CHECK_COMMAND"

---

---

p.s.The above assumes you're adding that to /etc/crontab. To use it in a user's crontab (crontab -e) simply leave out the username (root) before the command.

p.s.The above assumes you're adding that to /etc/crontab. To use it in a user's crontab (crontab -e) simply leave out the username (root) before the command.

回答by Ranjithkumar T

You can save your script in file name, myscript.sh

You can save your script in file name, myscript.sh

then you can run your script through cron,

then you can run your script through cron,

 */30 * * * * /full/path/for/myscript.sh

or you can use while

or you can use while

 # cat script1.sh
 #!/bin/bash
 while true; do /bin/sh /full/path/for/myscript.sh ; sleep 30; done &

 # ./script1.sh

Thanks.

Thanks.

回答by podshumok

I would suggest using watch:

I would suggest using watch:

watch -n 30 launch_my_script_if_process_is_dead.sh

回答by BillyBigPotatoes

I have found deamonizing critical scripts very effective.

I have found deamonizing critical scripts very effective.

http://cr.yp.to/daemontools.html

回答by jschnasse

You can use monitfor this task. See docu. It is available on most linux distributions and has a straightforward config. Find some examples in this post

You can use monitfor this task. See docu. It is available on most linux distributions and has a straightforward config. Find some examples in this post

For your app it will look something like

For your app it will look something like

check process myprocessname
    matching "91\.34\.124\.35"
    start program = "/home/asfd.sh"
    stop program = "/home/dfsa.sh"

If monitis not available on your platform you can use supervisord.

If monitis not available on your platform you can use supervisord.

I also found this question very similar Repeat command automatically in Linux. It suggests to use watch.

I also found this question very similar Repeat command automatically in Linux. It suggests to use watch.