Nagios nrpe query database data

Purpose: One thing I need to do recently is to query the business connection volume in postgres DB. If it is less than a certain threshold, send an SMS alert.

Current situation: Our nagios is on a separate server, and the business DB is on another DB

Idea: Very simple, business DB custom shell script, nagios calls it regularly

Steps: 1 Write the shell script check_con.sh on the DB server

~/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

Then modify the nrpe.cfg file under ~/nagios/etc

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

The first step is completed

The second part logs in to the Nagis server to modify the configuration.

1 Modify the commands.cfg file under /nagios/etc/objects

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

2Modify 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
                }

Finally restart the service and the job is done.

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

Nagios nrpe query database data

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