nagios——docker容器监控

1. 环境：

# cat /etc/redhat-release

 CentOS release 6.8 (Final)

# uname -r

 3.10.5-3.el6.x86_64

Nagios服务端主机：192.168.70.67        密码：ikongjian@2016!         

Nagios客户端主机：192.168.70.52        密码：ikongjian@2016!    

2. 版本

Nagios版本：     nagios-3.5.1

Plugin插件版本： nagios-plugins-1.4.16

Nrpe版本：      nrpe-2.12

安装路径： /usr/local/nagios

3. 需求分析

实现目的：实现docker容器的内存监控

实现工具：监控系统nagios

实现原理：

          1，nagios客户端写dcoker容器内存监控插件，并开启nrpe守护进程

          2，服务端check_nrpe链接客户端守护进程，取插件执行结果，返回给web界面。

4. 客户端配置

/usr/local/nagios/etc/nrpe.cfg

增加以下配置：

command[check_docker101]=/usr/local/nagios/libexec/check_docker101

插件如下：

vim /usr/local/nagios/libexec/check_docker101

#/bin/bash

DOCKER_NAME=`echo $0|awk -F '_' '{print $2}'`

DOCKER_ID=`cat /data/docker_id.txt|grep ${DOCKER_NAME}|awk '{print $2}'`

TOTAL_MEM=`cat /cgroup/memory/docker/${DOCKER_ID}/memory.limit_in_bytes`

USE_MEM=`cat /cgroup/memory/docker/${DOCKER_ID}/memory.usage_in_bytes`

FREE=`echo ${TOTAL_MEM}-${USE_MEM}|bc`

FREE_MB=`expr $FREE/1024/1024|bc`

if   [ $FREE_MB -ge 100 ]

     then

     echo "CHECK_MEORY OK - $FREE_MB M free "

     exit 0

elif [ $FREE_MB -lt 100 -a $FREE_MB -gt 30 ]

     then

     echo "CHECK_MEORY WARNING - $FREE_MB M free"

     exit 1

elif [ $FREE_MB -le 30 ]

     then

     echo "CHECK_MEORY CRITICAL - $FREE_MB M free"

     exit 2

else

     echo "CHECK_MEORY UNKOWN mem lessest"

     exit 3

fi

给权限：

chmod 755 /usr/local/nagios/libexec/check_docker101

chown nagios.nagios /usr/local/nagios/libexec/check_docker101

执行查件：

[root@test6 data]# /usr/local/nagios/libexec/check_docker101

CHECK_MEORY OK - 261 M free

5. 服务端配置

A：配置命令文件——commands.cfg

   define command{

        command_name    check_docker101

        command_line    $USER1$/check_docker101

}

B：配置主机文件——host.cfg

define host{

        use                     linux-server

        host_name               docker

        alias                   docker

        address                 192.168.70.52

        max_check_attempts      3

        normal_check_interval   2

        process_perf_data       1

        action_url              /nagios/pnp/index.php?host=$HOSTNAME$

        }

C：配置服务文件——service.cfg

define service{

        use                             generic-service

        host_name                       docker

        service_description             docker_mem_101

        check_command                   check_nrpe!check_docker101

        process_perf_data               1

        }

用check_nrpe测试远端插件：

[root@BI-test etc]# /usr/local/nagios/libexec/check_nrpe -H 192.168.70.52 -c check_docker101

CHECK_MEORY OK - 261 M free

一切正常。