index.rst

Nrpe Agent

Table of Contents

• Overview

Overview

Nrpe is used for monitoring remote hosts.

To install the nrpe client on a remote host, you can use the nrpe.sh file in /script directory.

The script content is below:

   #!/bin/bash
   #Info: This script installs a NRPE client, following [1]
   #[1] https://support.nagios.com/kb/article.php?id=515

   #Nagious server, that will monitor this client node
   NAGIOS_MON_HOST='1.2.3.4'
   NAGIOS_HOME='/usr/local/nagios/'

   function detect_distro(){
   if [ -f /etc/centos-release ]; then
             DISTRO='centos'
             DISTRO_VER=$(grep VERSION_ID /etc/os-release | tr -d '"' | cut -f2 -d= | cut -f1 -d.)

   #opensuse,debian,slackware, ubuntu
           elif [ -f /etc/os-release ]; then
             DISTRO=$(grep -m 1 ID /etc/os-release | cut -f2 -d= | tr -d '"')
             DISTRO_VER=$(grep VERSION_ID /etc/os-release | tr -d '"' | cut -f2 -d= | cut -f1 -d.)
           else
             echo "Error: Failed to detect distribution"; exit 1;
           fi
   }

   function install_deps(){
   if [ ${DISTRO} == 'centos' ]; then
    yum install -y gcc glibc glibc-common openssl openssl-devel perl wget
   elif [ ${DISTRO} == 'ubuntu' ]; then
   export DEBIAN_FRONTEND=noninteractive
   if [ ${DISTRO_VER} -eq 18 ]; then
   apt-add-repository universe
   fi
   apt-get install -y autoconf automake gcc libc6 libmcrypt-dev make libssl-dev wget openssl make
   fi
   }

   function install_nrpe(){
   NRPE_VER='3.2.1'

   if [ $(grep -m 1 -c '^nagios:' /etc/passwd) -eq 0 ]; then
   useradd -s /bin/false nagios
   fi

   pushd ${HOME}
   if [ ! -f nrpe-${NRPE_VER}.tar.gz ]; then
   wget --no-check-certificate https://github.com/NagiosEnterprises/nrpe/archive/nrpe-${NRPE_VER}.tar.gz
      fi

   tar xzf nrpe-${NRPE_VER}.tar.gz
   rm -f nrpe-${NRPE_VER}.tar.gz

   pushd nrpe-nrpe-${NRPE_VER}/

   if [ $(which systemctl 2>/dev/null | grep -c yum) -eq 1 ]; then
     ./configure --enable-command-args --with-init-type=systemd
   else
     ./configure --enable-command-args
   fi

   make all install install-groups-users install-plugin install-config install-init
   popd
   rm -f nrpe-nrpe-${NRPE_VER}/
   popd
   }

   function config_nrpe(){
     sed -i "/^allowed_hosts=/s/\$/,${NAGIOS_MON_HOST}/" ${NAGIOS_HOME}/etc/nrpe.cfg
   sed -i 's/^dont_blame_nrpe=.*/dont_blame_nrpe=1/g'  ${NAGIOS_HOME}/etc/nrpe.cfg

   #Standard command found in source/package plugins
   cat >> ${NAGIOS_HOME}/etc/nrpe.cfg <<CMD_EOF
   command[check_disk_root]=${CUSTOM_PLUGINS_HOME}/check_disk -w 30% -c 10% -p /
   CMD_EOF

   cat >> ${NAGIOS_HOME}/etc/nrpe.cfg <<CMD_EOF
   command[check_linuxdiskspace]=${CUSTOM_PLUGINS_HOME}/check_linuxdiskspace
   CMD_EOF

   #Linux S.M.A.R.T Checks
   #NOTE: we may have /dev/vda1 for virtual disk
   for sd in $(find /dev -type b -name 'sd[a-z][0-9]' | cut -f3 -d/); do
   echo "command[check_linux_smart_${sd}]=${CUSTOM_PLUGINS_HOME}/check_ide_smart -d /dev/${sd}" >> ${NAGIOS_HOME}/etc/nrpe.cfg
   done


   if [ $(which systemctl 2>/dev/null | grep -c systemctl) -eq 1 ]; then
   systemctl enable nrpe.service
   systemctl start nrpe
   else
   chkconfig --set nrpe on
   service nrpe start
   fi
   }

   function install_plugins_source(){
   PLUG_VER='2.3.1'

   if [ ${DISTRO} == 'centos' ]; then
      yum install -y gcc glibc glibc-common make gettext automake autoconf wget openssl-devel net-snmp net-snmp-utils epel-release perl-Net-SNMP
   elif [ ${DISTRO} == 'ubuntu' ]; then
   apt-get install -y autoconf gcc libc6 libmcrypt-dev make libssl-dev wget bc gawk dc build-essential snmp libnet-snmp-perl gettext
   fi

   pushd ${HOME}
      wget --no-check-certificate https://github.com/nagios-plugins/nagios-plugins/archive/release-${PLUG_VER}.tar.gz
      tar xzf release-${PLUG_VER}.tar.gz
      rm -f release-${PLUG_VER}.tar.gz

      pushd nagios-plugins-release-${PLUG_VER}/
      ./tools/setup
      ./configure
      make
      make install
      popd
      rm -rf nagios-plugins-release-${PLUG_VER}/
      popd

   NAGIOS_PLUGINS_HOME='/usr/local/nagios/libexec/'
   }


   function install_plugins(){
   install_plugins_source
   }

   function test_nrpe(){
     if [ ! -f ${NAGIOS_HOME}/etc/nrpe.cfg ]; then
     echo 'Error: nrpe.cfg is missing!'
      fi

   OUT=$(${NAGIOS_HOME}/libexec/check_nrpe -H 127.0.0.1)
   if [ "${OUT}" == "NRPE v${NRPE_VER}" ]; then
      echo "NRPE Test OK"
   else
      echo "NRPE Test FAILED"
      exit 1;
   fi
   }

   detect_distro;
   install_deps;
   install_nrpe;
   install_plugins;
   config_nrpe;

   test_nrpe;