= Nagios =
Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes.

== Check command ==
{{{#!highlisht bash
/usr/local/nagios/libexec/check_nrpe -H 192.168.1.1 -c check_metric
}}}


== Sample /etc/nagios/nrpe config file on CentOS 6.3 64 bit, host checked by Nagios ==
{{{
log_facility=daemon
pid_file=/var/run/nrpe/nrpe.pid
server_port=5666
nrpe_user=nrpe
nrpe_group=nrpe
#nagios server 192.168.1.2
allowed_hosts=196.168.1.2,127.0.0.1
dont_blame_nrpe=0
debug=1
command_timeout=60
connection_timeout=300
include_dir=/etc/nrpe.d/

command[check_users]=/usr/lib64/nagios/plugins/check_users -w 5 -c 10
command[check_load]=/usr/lib64/nagios/plugins/check_load -w 15,10,5 -c 30,25,20
command[check_hda1]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p /dev/hda1
command[check_zombie_procs]=/usr/lib64/nagios/plugins/check_procs -w 5 -c 10 -s Z
command[check_total_procs]=/usr/lib64/nagios/plugins/check_procs -w 150 -c 200 
}}}

== check_oracle_health shows warning when OK ==
[[http://forums.meulie.net/viewtopic.php?f=62&t=6282]]

== Nagios shows Warning when is OK ==
Run the command locally on the target server with the user nrpe
 * su nrpe
 * mycommand.py
 * echo $?

If there are problems of permissions or similar wqhen running with the user nrpe solve them
Always test the commands under the user nrpe.

If the command creates or uses files, delete them if the command tested with root, so they are created properly with the right permissions.