From Nagios Wiki

The following HOWTO describes how to install NRPE on AIX so that Nagios can monitor things such as CPU load, running processes, concurrent users, drive capacity, etc.

[edit] installing via pre-built binaries (easiest)

1. grab binary file from [p_view=1153 NagiosExchange.org]
2. downloaded AIX nrpe package
   cd /opt
   wget http://www.domain.com/path/to/nrpe-nsca-plugins.tgz
3. unzip and untar package in /opt

   gunzip /opt/nrpe-nsca-plugins.tgz<br />tar xvf /opt/nrpe-nsca-plugins.tar

   ('tar tvf /opt/nrpe-nsca-plugins.tar' to list contents)
   (rm '/opt/nrpe-nsca-plugins.tar' to remove)
4. Copy /etc files to /etc folder (optional, but where many UNIX admins prefer to keep all config files)

   cp /opt/nagios/etc/* /etc/

   OR log on another similar box and type in the following to push it over to this box

   scp nrpe.cfg root@otherbox:/etc

   OR grab nrpe.cfg from another box and copy to your /etc directory

   scp root@otherbox:/etc/nrpe.cfg /etc/

   if you have scp'd correctly, should see something like this

   nrpe.cfg                                      100% 9415     9.2KB/s   00:00

5. modify NRPE handler command[check_whatever] paths to reflect the binaries in /opt
   e.g.
   /etc/nrpe.cfg

   command[check_users]=/opt/nagios/libexec/check_users -w 5 -c 10

6. copy Nagios bin files in /usr/bin

   cp /opt/nagios/bin/* /usr/bin

7. add nrpe to /etc/rc.local so that it autostarts upon reboot

   nohup /usr/bin/nrpe -c /etc/nrpe.cfg -d

   (should see following if done correctly)

   Sending nohup output to nohup.out.

8. start the NRPE process, and point it to the nrpe.cfg file which will control your system

   /usr/bin/nrpe -c /etc/nrpe.cfg -d

9. double check to make sure rc.local entry is correct and that process is running

   less /etc/rc.local

   (should output)

   nohup /usr/bin/nrpe -c /etc/nrpe.cfg -d > /dev/null 2>&1#Start NRPE for Nagios

   AND

   ps -ef | grep nrpe
   

   root 458886 589858   0 01:11:51  pts/0  0:00 grep nrpe
   nagios 536778      1   0 01:11:13      -  0:00 /usr/bin/nrpe -c /etc/nrpe.cfg -d

[root:rpmrep:/etc]

1. check from nagios box (tested on CentOS 4.x)

cd /usr/lib/nagios/plugins/
./check_nrpe -H AIX_Server -c check_whatever

[edit] installing via source

wget http://www.libgd.org/releases/gd-2.0.35.tar.gz
gunzip gd-2.0.35.tar.gz
tar -xvpf
cd gd-2.0.35.tar.gz

untar nrpe
tar z nrpefile.tar.gz
tar xfv nrpefile.tar
cd nrpefile
./configure (options)
make install

[edit] Troubleshooting

1. Errors in your nrpe.cfg will show up in syslog. Tail the logs, and you can see which line number you need to fix.

tail /adm/log/syslog