How to enable Available memory monitoring in Linux servers

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1

Hello Team,

I am using nrpe for performance monitoring on Linux servers. I am getting lot of alerts on free memory. Is it possible to consider available memory in the alert settings for monitoring instead of free memory

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2

Hi,

it would help us in the community a lot to know which check-command you are using and how the service definition looks like.

3

Hi @stevie-sy, the below is my service definition

apply Service “Memory” {
import “service_check”
check_command = “check_nrpe”
vars.nrpe_command = “check_mem”
vars.nrpe_arguments = [ ]
assign where host.vars.os == “Linux”
}

4

Hi,

and which script/check is defined behind the check_command “check_nrpe” on your system? I find two diffrent checks in the web: a perl and a bash script. Depending which one you have installed/configured, you could check the possible params

5

Hi @stevie-sy,

I am using check_mem.pl

Reference: [https://raw.githubusercontent.com/justintime/nagios- plugins/master/check_mem/check_mem.pl]

6

If you check the source or the argument list you would see what is possible with this check

sub usage() {
  print "\ncheck_mem.pl v1.0 - Nagios Plugin\n\n";
  print "usage:\n";
  print " check_mem.pl -<f|u> -w <warnlevel> -c <critlevel>\n\n";
  print "options:\n";
  print " -f           Check FREE memory\n";
  print " -u           Check USED memory\n";
  print " -C           Count OS caches as FREE memory\n";
  print " -h           Remove hugepages from the total memory count\n";
  print " -w PERCENT   Percent free/used when to warn\n";
  print " -c PERCENT   Percent free/used when critical\n";
  print "\nCopyright (C) 2000 Dan Larsson <dl\@tyfon.net>\n";
  print "check_mem.pl comes with absolutely NO WARRANTY either implied or explicit\n";
  print "This program is licensed under the terms of the\n";
  print "MIT License (check source code for details)\n";
  exit $exit_codes{'UNKNOWN'};
}
8

The memory check is useless and always has been. We use this one and it takes into account available memory and swap (configurable): Useful Icinga/Nagios Linux Memory check · GitHub

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