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NRPE-AND-NRPE-PLUGIN-ON-CLIENT-MACHINE(SANDHAR)

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STEPS TO CONFIGURE NRPE AND NRPE PLUGIN ON CLIENT MACHINE:-


ON CLIENT MACHINE:

Install libraries for dependencies as it would help in compiling the NRPE packages.


Step 1- install libraries

  1. yum install -y gcc glibc glibc-common gd gd-devel make net-snmp openssl-devel

step 2- user and password

  1. useradd nagios
  2. passwd nagios

step 3-extract plugins

  1. tar –xvf nagios-plugins-1.5.tar.gz

step 4- compile and install

  1. cd nagios-plugins-1.5
  2. ./configure
  3. make
  4. make install

step 5-permissions on plugins

  1. chown nagios.nagios /usr/local/nagios
  2. chown -R nagios.nagios /usr/local/nagios/libexec

step 6-install xinetd

  1. yum install xinetd

step 7-install nrpe

tar xzf nrpe-2.15.tar.gz

  1. cd nrpe-2.15
  2. ./configure
  3. make all
  4. make install-plugin
  5. make install-daemon
  6. make install-daemon-config
  7. make install-xinetd

step 8-add nagios monitoring server ip

  1. vim /etc/xinetd.d/nrpe

add only_from = 127.0.0.1 <nagios_ip_address>

  1. vim /etc/service

add nrpe 5666/tcp #NRPE

step 9-restart xinetd

  1. /etc/init.d/xinetd restart

step 10-verify nrpe daemon

  1. netstat -at | grep nrpe

tcp 0 0 *:nrpe *:* LISTEN

step 11-To check nrpe daemon is workig properly

  1. /usr/local/nagios/libexec/check_nrpe -H localhost

NRPE v2.15

step 12- customize nrpe commands and add commands

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

command[check_users]=/usr/local/nagios/libexec/check_users -w 5 -c 10 command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20 command[check_hda1]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/mapper/vg_mail1-LogVol01 command[check_zombie_procs]=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z command[check_cpu]=/usr/local/nagios/libexec/check_cpu.sh -w 60 -c 70 command[check_mem]=/usr/local/nagios/libexec/check_mem_avail -w 10 -c 5 command[check_queue]=/usr/local/nagios/libexec/check_postfix_queue -w 200 -c 250 command[check_zimbra_lmtp]=/usr/local/nagios/libexec/check_smtp -H localhost -p 7025 -e '220 node.sandhar.in Zimbra LMTP server ready' command[check_smtp]=/usr/local/nagios/libexec/check_smtp -H localhost

step 13 -run /etc/init.d/xinetd restart

step 14 – reload nagios on nagios server:

  1. /etc/init.d/nagios reload

step 15 -After then we should call all services from nagios server:

  1. /usr/local/nagios/libexec/check_nrpe -H 172.17.16.22 -c check_zimbra_lmtp

ERROR: could not complete SSL handshake

  1. /usr/local/nagios/libexec/check_nrpe -H 172.17.16.22 -c check_smtp

ERROR: could not complete SSL handshake

That means we are not able to call services from nagios server to client machine. This is happening because of openssl library missing. For this we need to run nrpe as daemon with non ssl. The command is:

  1. /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d -n

Now in future whenever we will add services of mailserver in sandhar, we need to follow below steps:

step 16-kill the nrpe running and run nrpe as daemon. 

   # ps -elf | grep nrpe

0 S root 747 15083 0 80 0 - 25813 pipe_w 10:59 pts/0 00:00:00 grep nrpe 5 S nagios 22682 1 0 80 0 - 9810 poll_s Feb02 ? 00:00:00 /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d -n 

  # kill -9  22682 
  # /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d -n

step -17 Now test from nagios server.

  1. /usr/local/nagios/libexec/check_nrpe -H 172.17.16.22 -c check_zimbra_lmtp

SMTP OK - 0.001 sec. response time|time=0.000956s;;;0.000000

  1. /usr/local/nagios/libexec/check_nrpe -H 172.17.16.22 -c check_smtp

SMTP OK - 0.002 sec. response time|time=0.002258s;;;0.000000

  1. /usr/local/nagios/libexec/check_nrpe -H 172.17.16.22 -c check_cpu

OK - user: 23.22, nice: 1.11, sys: 2.95, iowait: 0.62, irq: 0.50, softirq: 0.74 idle: 74.33 | 'user'=23.22 'nice'=1.11 'sys'=2.95 'softirq'=0.74 'iowait'=0.62 'irq'=0.50 'idle'=74.33

  1. /usr/local/nagios/libexec/check_nrpe -H 172.17.16.22 -c check_queue

33 mail(s) in queue | mail_queue=33

step 18- Add host on nagios server of sandhar.

  1. vim /usr/local/nagios/etc/objects/linux-box.cfg

define host{ 

       use                      linux-server 
       host_name               CORP-MAILSERVER 
       alias                   CORP-MAILSERVER 
       address                172.17.16.22 
       hostgroups      Windows Server 
}

step 19- Add services on nagios server.

define service{ 

         use                 generic-service 
         host_name           CORP-MAILSERVER 
         service_description Current Users 
         notification_options     w,u,c,r 
         check_command       check_nrpe!check_users

}


define service{ 

         use                 generic-service 
         host_name           CORP-MAILSERVER 
         service_description Server Load 
        notification_options     w,u,c,r 
         check_command       check_nrpe!check_load

} define service{ 

         use                 generic-service 
         host_name           CORP-MAILSERVER 
         service_description Disk Space 
         notification_options     w,u,c,r 
         check_command       check_nrpe!check_hda1

} define service{ 

         use                 generic-service 
         host_name           CORP-MAILSERVER 
         service_description Zombie process 
          notification_options     w,u,c,r 
         check_command       check_nrpe!check_zombie_procs

} define service{ 

         use                 generic-service 
         host_name           CORP-MAILSERVER 
         service_description CPU Load 
         notification_options     w,u,c,r 
         check_command       check_nrpe!check_cpu

} define service{ 

         use                 generic-service 
         host_name           CORP-MAILSERVER 
         service_description Memory Utilization 
         notification_options     w,u,c,r 
         check_command       check_nrpe!check_mem

} define service{ 

         use                 generic-service 
         host_name           CORP-MAILSERVER 
         service_description Mail Queue 
         notification_options     w,u,c,r 
         check_command       check_nrpe!check_queue

} define service{ use generic-service 

         host_name           CORP-MAILSERVER 
         service_description Mail Queue 
         notification_options     w,u,c,r 
         check_command       check_nrpe!check_queue

} define service{ 

         use                 generic-service 
         host_name           CORP-MAILSERVER 
         service_description LMTP 
         notification_options     w,u,c,r 
         check_command       check_nrpe!check_zimbra_lmtp

}

define service{ 

         use                 generic-service 
         host_name           CORP-MAILSERVER 
         service_description SMTP 
         notification_options     w,u,c,r 
         check_command       check_smtp

}

step 20- verify the nagios.cfg file.

  1. /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

Checking services... Checked 815 services. Checking hosts... Checked 108 hosts. Checking host groups... Checked 5 host groups. Checking service groups... Checked 0 service groups. Checking contacts... Checked 16 contacts. Checking contact groups... Checked 12 contact groups. Checking service escalations... Checked 2962 service escalations. Checking service dependencies... Checked 0 service dependencies. Checking host escalations... Checked 0 host escalations. Checking host dependencies... Checked 0 host dependencies. Checking commands... Checked 70 commands. Checking time periods... Checked 6 time periods. Checking for circular paths between hosts... Checking for circular host and service dependencies... Checking global event handlers... Checking obsessive compulsive processor commands... Checking misc settings...

Total Warnings: 0 Total Errors: 0

If we get below error in the escalation.cfg file that means there is empty services defined for any host. For this we need to check config file. ERROR: could not expand the services defined in ‘service escalation’ config ( /usr/local/nagios/etc/objects/escalation.cfg )

First disable the escalation.cfg in nagios.cfg file:

  1. cfg_file=/usr/local/nagios/etc/objects/escalation.cfg
Second verify the config file nagios.cfg file:
  1. /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

It will show you the warning like this: Checking host escalations... Checked 0 host escalations. Checking host dependencies... Warning: ‘node1.sandhar.in’ Checking commands... Checked 70 commands.

To resolve this either you define the services for that host or disable that host. And verify the nagios.cfg file. If total warnings is 0 and total errors is 0 then reload nagios.

  1. /etc/init.d/nagios reload
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