Bash script to periodically monitor a process's memory usage
I'm looking for a bash script that allows me to start a process in background, monitor its memory consumption every 10 minutes for example, and if it exceeds a certain value kill it and restart it.
Some idea?
I'm new to bash programming, I started writing a script and after testing it I always get the same error,
how to proceed? I run the code on an ec2 aws istance
Hello and welcome
It's customary to help on this resource, that is, you solve a problem and you don't succeed or you're stuck on something and don't know how to continue. Therefore, if you have a desire to try to write such a script yourself, then everyone here will readily help you. In addition,
creation is much more interesting and useful. The script is quite ordinary and writing will take much less time than finding a ready-made solution. If you are ready to make an effort, it is useful to start by breaking the task down into stages.
First, launching the scheduled task. For this, I think 'crontab' will work well.
Second, getting value of consumption process memory. The 'ps' utility is well suited for this, which can take a command name with the option '-C' or the process id with '-p' option. Using the formatted '-o pmem=' output, you can get memory consumption in percentage terms. This value is of type float, but cutting off the decimal part will not be a problem.
And last, comparing the obtained value with a constant, we determine the need for restarting the process.
My regards
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I'm new to bash programming, I started writing a script and after testing it I always get the same error,
how to proceed? I run the code on an ec2 aws istance
I can't reproduce that specific error with the script you posted. Sure you posted the correct and complete one?
Two comments:
- The #! token ("shebang") HAS to be the first two chars of a script file in order to work.
- bash doesn't handle floating variables or values - neither $memory which is filled by ps with decimals, nor the "20.0" constant.
EDIT: OK, got it:
your script lines seem to be terminated with DOS line terminators <CR> = \r = 0x0D = ^M. With
, I have the same error ...
Use a decent *nix text editor!
thanks for the advice it worked now after some tests I have come to write this code
I can correctly take the right pid of the process I would like to kill, but the sudo kill "$ FIRST" command does not seem to work and upon exiting the script, typing htop on the console, the process is still alive.
Also if I type sudo kill #pid directly on the console this command works and kills the process
Another twothree comments:
- bash provides the PID of the last process put in background in the $! variable (man bash).
- suppress ps' heading by supplying a = sign after the %mem so you have a single value.
- modify the $memory value WITHIN the loop; else you will either immediately break out, or enter an infinite loop.
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