最简单的nagios监控内存插件(shell)

首先看下内存信息吧

[root@localhost ~]# free -m

total used free shared buffers cached

Mem: 249 235 14 0 3 96

-/+ buffers/cache: 134 114

Swap: 2047 43 2003

一句话思路，取可用内存值(free)
free -m | awk 'NR==3{print $4}' 简单的取第三行第四列的值

#!/bin/bash
a=`free -m | awk 'NR==3{print $4}'`
if [ $a -ge 100 ]; then 大于等于100
echo $a
exit 0
elif [ $a -lt 100 ] && [ $a -gt 50 ];then 大于50小于100
echo $a
exit 1
else
echo $a
exit 2
fi

根据情况取值比如mem_free + cached，也可写成根据百分比判断

保存自定义插件到nagios下的插件目录 /usr/local/nagios/libexec/check_mem

配置/usr/local/nagios/etc/objects/localhost.cfg

define host {

host_name shenmeh

alias server1

address 192.168.1.129

check_command check-host-alive

notification_options d,r

check_interval 1

max_check_attempts 2

contact_groups admins

notification_interval 1

notification_period 24x7

}

define service {

host_name shenmeh

service_description server1_apache_mem

check_period 24x7

normal_check_interval 2

retry_check_interval 1

max_check_attempts 2

notification_period 24x7

notification_options w,u,c,r

check_command check_mem

}

配置/usr/local/nagios/etc/objects/commands.cfg

# 'check_mem' command definition

define command{

command_name check_mem

command_line $USER1$/check_mem

}

本文出自 “拿了你的泥” 博客，请务必保留此出处http://shenmeh.blog.51cto.com/6231527/1087477