Difference between revisions of "Setting up NRPE daemon"

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m
m (Cleanups for v1.10)
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Source code: http://nagios.org/
 
Source code: http://nagios.org/
  
To install, add the edge testing repository, then run:
+
To install, add the edge testing repository(for 1.9. If using 1.10, then main 1.10 repo has nrpe), then run:
 
  apk add nrpe
 
  apk add nrpe
 
Set up config file to bind to local IP, only allow needed hosts to connect (in our case, our redundant Nagios servers).
 
Set up config file to bind to local IP, only allow needed hosts to connect (in our case, our redundant Nagios servers).
 
Add a definition for a check command to /etc/nrpe.cfg, for example:
 
Add a definition for a check command to /etc/nrpe.cfg, for example:
 
  command[check_routes]=/usr/bin/check_routes.sh
 
  command[check_routes]=/usr/bin/check_routes.sh
Create the above script, and populate (code below needs a cleanup, but was done more as proof-of-concept):
+
Create the above script, and populate:
  ##!/bin/ash
+
  ##!/bin/bash
 
  ##
 
  ##
 
  ## Script to check whether routes to branches are being received properly
 
  ## Script to check whether routes to branches are being received properly
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  OK: 173 routes in routing table
 
  OK: 173 routes in routing table
  
If you are having trouble, enable debugging in /etc/nrpe.cfg, and check /var/log/messages for errors.  Most likely error(s) has to do with permissions of what you are trying to execute.  Remember that scripts are executed as nagios user, not root, so keep the "fancy tricks" to a minimum.
+
If you are having trouble, enable debugging in /etc/nrpe.cfg, and check /var/log/messages for errors.  Most likely error(s) has to do with permissions of what you are trying to execute.

Revision as of 10:45, 17 March 2010

Source code: http://nagios.org/

To install, add the edge testing repository(for 1.9. If using 1.10, then main 1.10 repo has nrpe), then run:

apk add nrpe

Set up config file to bind to local IP, only allow needed hosts to connect (in our case, our redundant Nagios servers). Add a definition for a check command to /etc/nrpe.cfg, for example:

command[check_routes]=/usr/bin/check_routes.sh

Create the above script, and populate:

##!/bin/bash
##
## Script to check whether routes to branches are being received properly
NUMROUTES=`ip route | grep -n  | awk -F ':' '{print $1}' | tail -n 1`
if [[ $NUMROUTES > 80 ]];
then echo "OK: $NUMROUTES routes in routing table" && exit 0;
elif [[ $NUMROUTES < 80 ]] && [[ $NUMROUTES > 15 ]];
then echo "WARNING: $NUMROUTES routes in routing table" && exit 1;
elif $NUMROUTES = "" ;
then echo "WARNING: No routing information received" && exit 1;
else echo "CRITICAL: $NUMROUTES routes in routing table" && exit 2;
fi

Restart NRPE. Allow port 5666 through Shorewall (in /etc/shorewall/rules) through to monitoring hosts. On the monitoring host, run the following command to test:

root#/usr/local/nagios/libexec/check_nrpe -H 10.14.8.3 -p 5666 -c check_routes

You should get output like:

OK: 173 routes in routing table

If you are having trouble, enable debugging in /etc/nrpe.cfg, and check /var/log/messages for errors. Most likely error(s) has to do with permissions of what you are trying to execute.