Nagios nrpe 查询数据库数据

目的：最近要做一个事情就是在postgres DB里查询业务连接量，如果小于某个阈值就发短信告警

现状：我们nagios在单独的服务器，业务DB在另一台DB

思路：很简单，业务DB自定义shell 脚本，nagios定期调用

步骤： 1 在DB服务器上编写shell脚本 check_con.sh

~/nagios/libexec

#! /bin/sh
COUNT_C=34
su - postgres -c "psql  XXdb > ~/db_output.txt <<-EOF
select count(distinct tnm)
from my_bussiness_table
where register_datetime  between now() - interval '2 hour' and now();
"
COUNT_C=`sed -n '3,3p' ~/db_output.txt`

if [ $COUNT_C -le $2 ];then
    echo "Critical $COUNT_C"
    exit 2
elif [ $COUNT_C -le $4 ];then
    echo "Warning $COUNT_C"
    exit 1
elif [ $COUNT_C -gt $4 ];then
   echo "OK  $COUNT_C"
   exit 0
else
   echo "UNKNOWN $COUNT_C"
   exit 3
fi

然后修改 ~/nagios/etc 下的nrpe.cfg文件

command[check_connect]=~/nagios/libexec/check_con.sh $ARG1$

第一步就算完成了

第二部登陆Nagis服务器修改配置

1 修改/nagios/etc/objects下的commands.cfg文件

define command{
        command_name    check-connect
        command_line    $USER1$/check_connect -w $ARG1$ -c $ARG2$ -p $ARG3$
        }

2修改 server.cfg

define service{
        use                             XXXX-service
        host_name                       DB
        service_description             [proc] CONNECT
        check_command                   check_nrpe!check_connect -a '-c 0 -w 1 -p db'
        normal_check_interval           30
                }

最后重启服务，就大工告成了

 sudo systemctl restart nagios.service
 sudo systemctl restart nrpe.service