Install Nagios-NRPE Client in Debian Machines

November 16, 2019

Follow Step by Step to Install Nrpe client in Remote servers you want to monitor from Nagios core

  1. Update Repository and install GCC

    apt-get update && apt-get upgrade -y
apt-get install build-essential -y
gcc -v
make -v

  2. Create user which will run NRPE scripts in remote servers

    useradd nagios
passwd nagios

  3. Nagios plugin download and install

    cd /tmp
#wget https://www.nagios-plugins.org/download/nagios-plugins-1.5.tar.gz
wget https://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz
tar -xzvf nagios-plugins-*.tar.gz
rm nagios-plugins-*.tar.gz
cd nagios-plugins-*
apt-get install libssl-dev -y
./configure --with-nagios-user=nagios --with-nagios-group=nagios
make
make install
chown nagios:nagios /usr/local/nagios
chown -R nagios:nagios /usr/local/nagios/libexec
apt-get install xinetd -y

  4. NRPE daemon download and install

    cd /tmp
#wget https://github.com/NagiosEnterprises/nrpe/releases/download/nrpe-3.2.1/nrpe-3.2.1.tar.gz
wget https://github.com/amitanvir/nagios-plugin-and-nrpe-installer/raw/master/nrpe-2.12.tar.gz
tar -xzvf nrpe-*.tar.gz
rm nrpe-*.tar.gz
cd nrpe-*
ln -s /usr/lib/x86_64-linux-gnu/libssl.so /usr/lib/libssl.so
./configure
make all
make install-plugin
make install-daemon
make install-daemon-config
make install-xinetd

  5. Configure NRPE

    Edit Xinetd NRPE entry for adding Nagios Monitoring server to the “only_from” directive

    nano /etc/xinetd.d/nrpe

    only_from = 127.0.0.1 {nagios server ip}

    Edit services file for adding entry for nrpe daemon

    nano /etc/services

    nrpe 5666/tcp # NRPE

    Restart the NRPE service

    /etc/init.d/xinetd restart

    Test if NRPE is listening

    netstat -at | grep nrpe

    The output out this command should show something like this
    tcp 0 0 *:nrpe *:* LISTEN

    Next, check to make sure the NRPE daemon is functioning properly. To do this, run the check_nrpe plugin that was installed for testing purposes.

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

    If everything is fine you will see this output:
    NRPE v2.12

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