Nagios Monitoring Linux host monitoring memory scripts

Source: Internet
Author: User

Description

The work consists of two parts of the monitoring side (123) and the monitored end (iv)

One, add script in Nrpe.cfg

Add Command index in NRPE.CFG

COMMAND[CHECK_USED_MEM]=/USR/LOCAL/NAGIOS/LIBEXEC/CHECK_USED_MEM.SH 80 90

Description: Actual memory usage exceeds 80% warning; more than 90% critical warnings

Second, add the specific script

Reference Script check_used_mem.sh

Warn=$1Critical=$2 All= ' Free | Sed-n'2p'| Awk'{print $}'' used= ' Free | Sed-n'3p'| Awk'{print $}'' Let"c= $used *100/$all"if[[$c-Lt $warn]] Then Echo"used Mem/total < $warn% [used: $used, total: $total: $all]"Exit 0elif[[$c-Lt $critical]] Then Echo"used mem/total≥ $warn% [used: $used, total: $total: $all]"Exit1ElseEcho"used mem/total≥ $critical% [used: $used, total: $total: $all]"Exit2fi

Explain:

1. $ $ and $ are the first to second parameters of the input, for example:

del.sh script content is

#/bin/bashecho $1
    • SH del.sh a #第一个参数是a
    • chmod a+x./del.sh a #第一个参数是a

2. Free to view memory usage

 [[Email protected]_202_12/]# free - M total used  free   sh ared buffers Cachedmem:  3072  2459  612  0  207  1803 -/+ buffers/cache: 447 2624  swap:  1913  0  1913  
    • Total Memory: 3072
    • Used number of memory used: 2459
    • Free Memory Number: 612
    • GKFX is currently obsolete. No, always 0.
    • Buffers:buffer Cache Memory: 13220
    • Cached:page Cache Memory: 2720160

Relationship: total = used + Free

Line 3rd:
The meaning of-/+ Buffers/cache:
-buffers/cache Memory: 447 (equals 1th row of used-buffers-cached)
+buffers/cache Memory: 2624 (equals 1th line of Free + buffers + cached)
Note: The amount of memory here is a little bit out of size after calculating it with the above formula (you don't know what the reason is).

The visible-buffers/cache reflects the memory that is actually eaten by the program, and +buffers/cache reflects the total amount of memory that can be appropriated.

3. Sed-n ' 2p ' refers to finding the second line

4. awk ' {print $} refers to the second column, which is separated by a space by default. You can specify the delimiter with-f

$echo 1b234b+awk'b'{ Print$'234

5. Utility [[]],< used to compare strings;-lt to compare numbers

Third, restart Nrpe
/usr/local/nagios/bin/nrpe-c/usr/local/nagios/etc/nrpe.cfg-d
Iv. adding monitoring items to the monitoring side
Define Service {        use                             generic-service        host_name                       100.61.  73.2,73.3        service_description             memory        Check_command                   Check_nrpe! check_used_mem        notifications_enabled           1        }

Nagios Monitoring Linux host monitoring memory scripts

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