Install Nagios Client on Enterprise Linux

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This article gives the steps to install Nagios Remote Plug-ins Execution daemon (NRPE or Nagios Client) on CentOS 6.x using RPMForge repository.


Install RPMForge Repository on Enterprise Linux
Setup Yum Priorities on Enterprise Linux

Install NRPE & Plugins

yum install nagios-nrpe nagios-plugins

Icon-Tip-Square-Green.png To install from a specific repository. One way is to temp disable the repository/s that you don't want to download from.

yum install nagios-nrpe nagios-plugins --disablerepo epel

Gnome-sticky-notes-applet nagios-common setups the user account and common directories.

Configuration Client

  • Edit /etc/nagios/nrpe.cfg
    vim /etc/nagios/nrpe.cfg
  • Add Nagios server/s to allow list

Enable Argument Based Checks (Optional)

  1. Enable Allow Arguments
  2. Comment Static Checks
    #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
  3. Uncomment Argument Checks
    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 $ARG3$
  4. Add Service/Daemon Check (Optional)
    command[check_service]=/usr/lib64/nagios/plugins/check_procs -w :50 -c 1: -C $ARG1$

Configure Firewall if Needed

Configure iptables to Allow Access to Common Services on Linux

Nagios NRPE Client
TCP Port 5666

Start Service

service nrpe start

Set Service to Start at Boot

chkconfig nrpe on

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