NAGIOS - Instalação do plugin NRPE

Cenário:
Colocar um novo servidor no monitoramento do NAGIOS.
 

mkdir -p /usr/local/packages
cd /usr/local/packages

groupadd -g 488 nagios
adduser -c 'NAGIOS user for the NAGIOS and NRPE service' -d / -g 488 -s /sbin/nologin -u 488 nagios

groupadd -g 489 nrpe
adduser -c 'NRPE user for the NRPE service' -d / -g 489 -s /sbin/nologin -u 489 nrpe

wget -c http://prdownloads.sourceforge.net/sourceforge/nagios/nrpe-2.13.tar.gz
wget -c http://prdownloads.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.15.tar.gz

tar xvzf nrpe-2.13.tar.gz
tar xvfz nagios-plugins-1.4.15.tar.gz

cd nagios-plugins-1.4.15
./configure --with-nagios-user=nrpe --with-nagios-group=nrpe
make all
make install

cd ../nrpe-2.13/
./configure --with-nagios-user=nrpe --with-nagios-group=nrpe --with-ssl-lib=/usr/local/ssl/lib/
make all
make install
chcon -R -t httpd_sys_content_t /usr/local/nagios/

cd

mkdir -p /etc/nagios
mkdir -p /var/run/nrpe
mkdir -p /etc/nrpe.d

vim /etc/nagios/nrpe.cfg

#Coloque o texto abaixo dentro do arquivo nrpe.cfg




#############################################################################
# Sample NRPE Config File
# Written by: Ethan Galstad (nagios@nagios.org)
#
# Last Modified: 11-23-2007
#
# NOTES:
# This is a sample configuration file for the NRPE daemon.  It needs to be
# located on the remote host that is running the NRPE daemon, not the host
# from which the check_nrpe client is being executed.
#############################################################################

# LOG FACILITY
# The syslog facility that should be used for logging purposes.

log_facility=daemon

# PID FILE
# The name of the file in which the NRPE daemon should write it's process ID
# number.  The file is only written if the NRPE daemon is started by the root
# user and is running in standalone mode.

pid_file=/var/run/nrpe/nrpe.pid

# PORT NUMBER
# Port number we should wait for connections on.
# NOTE: This must be a non-priviledged port (i.e. > 1024).
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

server_port=5666

# SERVER ADDRESS
# Address that nrpe should bind to in case there are more than one interface
# and you do not want nrpe to bind on all interfaces.
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

#server_address=127.0.0.1

# NRPE USER
# This determines the effective user that the NRPE daemon should run as.
# You can either supply a username or a UID.
#
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

nrpe_user=nrpe

# NRPE GROUP
# This determines the effective group that the NRPE daemon should run as.
# You can either supply a group name or a GID.
#
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

nrpe_group=nrpe

# ALLOWED HOST ADDRESSES
# This is an optional comma-delimited list of IP address or hostnames
# that are allowed to talk to the NRPE daemon.
#
# Note: The daemon only does rudimentary checking of the client's IP
# address.  I would highly recommend adding entries in your /etc/hosts.allow
# file to allow only the specified host to connect to the port
# you are running this daemon on.
#
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

allowed_hosts=127.0.0.1,200.201.207.74

# COMMAND ARGUMENT PROCESSING
# This option determines whether or not the NRPE daemon will allow clients
# to specify arguments to commands that are executed.  This option only works
# if the daemon was configured with the --enable-command-args configure script
# option.
#
# *** ENABLING THIS OPTION IS A SECURITY RISK! ***
# Read the SECURITY file for information on some of the security implications
# of enabling this variable.
#
# Values: 0=do not allow arguments, 1=allow command arguments

dont_blame_nrpe=0

# COMMAND PREFIX
# This option allows you to prefix all commands with a user-defined string.
# A space is automatically added between the specified prefix string and the
# command line from the command definition.
#
# *** THIS EXAMPLE MAY POSE A POTENTIAL SECURITY RISK, SO USE WITH CAUTION! ***
# Usage scenario:
# Execute restricted commmands using sudo.  For this to work, you need to add
# the nagios user to your /etc/sudoers.  An example entry for alllowing
# execution of the plugins from might be:
#
# nagios          ALL=(ALL) NOPASSWD: /usr/lib/nagios/plugins/
#
# This lets the nagios user run all commands in that directory (and only them)
# without asking for a password.  If you do this, make sure you don't give
# random users write access to that directory or its contents!

# command_prefix=/usr/bin/sudo

# DEBUGGING OPTION
# This option determines whether or not debugging messages are logged to the
# syslog facility.
# Values: 0=debugging off, 1=debugging on

debug=0

# COMMAND TIMEOUT
# This specifies the maximum number of seconds that the NRPE daemon will
# allow plugins to finish executing before killing them off.

command_timeout=60

# CONNECTION TIMEOUT
# This specifies the maximum number of seconds that the NRPE daemon will
# wait for a connection to be established before exiting. This is sometimes
# seen where a network problem stops the SSL being established even though
# all network sessions are connected. This causes the nrpe daemons to
# accumulate, eating system resources. Do not set this too low.

connection_timeout=300

# WEEK RANDOM SEED OPTION
# This directive allows you to use SSL even if your system does not have
# a /dev/random or /dev/urandom (on purpose or because the necessary patches
# were not applied). The random number generator will be seeded from a file
# which is either a file pointed to by the environment valiable $RANDFILE
# or $HOME/.rnd. If neither exists, the pseudo random number generator will
# be initialized and a warning will be issued.
# Values: 0=only seed from /dev/[u]random, 1=also seed from weak randomness

#allow_weak_random_seed=1

# INCLUDE CONFIG FILE
# This directive allows you to include definitions from an external config file.

#include=<somefile.cfg>

# INCLUDE CONFIG DIRECTORY
# This directive allows you to include definitions from config files (with a
# .cfg extension) in one or more directories (with recursion).

include_dir=/etc/nrpe.d/

# COMMAND DEFINITIONS
# Command definitions that this daemon will run.  Definitions
# are in the following format:
#
# command[<command_name>]=<command_line>
#
# When the daemon receives a request to return the results of <command_name>
# it will execute the command specified by the <command_line> argument.
#
# Unlike Nagios, the command line cannot contain macros - it must be
# typed exactly as it should be executed.
#
# Note: Any plugins that are used in the command lines must reside
# on the machine that this daemon is running on!  The examples below
# assume that you have plugins installed in a /usr/local/nagios/libexec
# directory.  Also note that you will have to modify the definitions below
# to match the argument format the plugins expect.  Remember, these are
# examples only!

command[check_users]=/usr/local/nagios/libexec/check_users -w 5 -c 10
command[check_load]=/usr/local/nagios/libexec/check_load -w 7,5,3 -c 12,10,8
command[check_xvda1]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/xvda1
command[check_xvda2]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/xvda2
command[check_xvdag]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/xvdag
command[check_xvdah]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/xvdah
command[check_zombie_procs]=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z
command[check_total_procs]=/usr/local/nagios/libexec/check_procs -w 550 -c 600
command[check_http]=/usr/local/nagios/libexec/check_http -w 5 -c 10 -H localhost
command[check_https]=/usr/local/nagios/libexec/check_http -w 5 -c 10 --ssl -H localhost
command[check_ssh]=/usr/local/nagios/libexec/check_ssh -p 22 localhost

# The following examples use hardcoded command arguments...

#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

# The following examples allow user-supplied arguments and can
# only be used if the NRPE daemon was compiled with support for
# command arguments *AND* the dont_blame_nrpe directive in this
# config file is set to '1'.  This poses a potential security risk, so
# make sure you read the SECURITY file before doing this.

#command[check_users]=/usr/lib64/nagios/plugins/check_users -w $ARG1$ -c $ARG2$
#command[check_load]=/usr/lib64/nagios/plugins/check_load -w $ARG1$ -c $ARG2$
#command[check_disk]=/usr/lib64/nagios/plugins/check_disk -w $ARG1$ -c $ARG2$ -p $ARG3$
#command[check_procs]=/usr/lib64/nagios/plugins/check_procs -w $ARG1$ -c $ARG2$ -s $ARG3$

===============================================

/usr/local/nagios/bin/nrpe -c /etc/nagios/nrpe.cfg -d
ps gauxwww | grep nrpe

/usr/local/nagios/libexec/check_nrpe -H localhost
/usr/local/nagios/libexec/check_nrpe -H localhost -c check_load

vim /etc/init.d/nrpe

#Coloque o texto abaixo dentro do arquivo nrpe
===============================================

#! /bin/sh
#

### BEGIN INIT INFO
# Provides:          nrpe
# Required-Start:    $local_fs $remote_fs $syslog $named $network $time
# Required-Stop:     $local_fs $remote_fs $syslog $named $network
# Should-Start:
# Should-Stop:
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start/Stop the Nagios remote plugin execution daemon
### END INIT INFO

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
DAEMON=/usr/local/nagios/bin/nrpe
PROG=nrpe
CONFIG=/etc/nagios/nrpe.cfg
PIDDIR=/var/run/nrpe

test -x $DAEMON || exit 0

# Source function library.
. /etc/init.d/functions

if [ ! -d "$PIDDIR" ]; then
        mkdir "$PIDDIR"
        chown nrpe "$PIDDIR"
fi
if [ -f "$PIDDIR/$PROG.pid" ]; then
        PID=$(cat $PIDDIR/$PROG.pid)
fi

set -e

start() {
        # Start daemons.
        echo -n $"Starting $PROG: "
        $DAEMON -c $CONFIG -d
        RETVAL=$?
        echo
        return $RETVAL
}

stop() {
        echo -n $"Shutting down $PROG: "
        kill -9 $PID
        RETVAL=$?
        test -e $PIDDIR/nrpe.pid && rm $PIDDIR/nrpe.pid
        echo
        return $RETVAL
}

# See how we were called.
case "$1" in
  start)
        start
        ;;
  stop)
        stop
        ;;
  restart|force-reload)
        stop
        start
        ;;
  *)
        echo $"Usage: $0 {start|stop|restart|force-reload}"
        exit 2
esac

===============================================

chmod 775 /etc/init.d/nrpe
chkconfig --level 2345 nrpe on
ps gauxwww | grep nrpe
service nrpe stop
ps gauxwww | grep nrpe
service nrpe start
ps gauxwww | grep nrpe