Nagios installation

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1. Install dependencies

 httpd
php
gcc, glibc-common
gd,gd-devel
make
net-snmp

 2. Create user and group for Nagios

 useradd nagios
groupadd nagcmd

 usermod -G nagcmd nagios
usermod -G nagcmd apache

 3. Download and extract nagios core

 4. configure the nagios by running below

 ./configure --with-command-group=nagcmd

 make all

 make install

 5.  make install-init   ==> To add services in init scripts

6.  make install-commandmode  ==> To use nagios in command mode

 7.  make install-config  ==> To install the configuration files

 8.  Configuration file locations

 /usr/local/nagios/etc/*
/usr/local/nagios/etc/objects/contacts.cfg -> for contact options

 9.  make install-webconf   => For installing httpd server configurations

 10. Adding users to nagios

 htpasswd -s -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

 11. start the httpd server

 service httpd start
systemctl start httpd.service

 12. Start the nagios server

 service nagios start

 13. The nagios web ui will be visible under

 http://<hostname>/nagios

 password would be the username and password given @the step 10
####################################################################
Installing nagios plugins
####################################################################

 1. Download the nagios plugin

 2. Extract the downloaded plugin

 tar -xvf nagios-plugin-xxx.tar.gz

 3. Run below commands to build and install

 ./configure --with-nagios-user=nagios --with-nagios-group=nagios

 make

 make install

 4.To verify the nagios configuration files

 /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

 Thats all!


 ####################################################################
Adding Hosts to Nagios server
####################################################################

 Adding new hosts = nrpe + nagios plugins

 Below needs to be done on hosts

 1. yum install -y gcc glibc glibc-common gd gd-devel make net-snmp openssl-devel

 2. Create user for nagios

 useradd nagios
passwd nagios

 3. Download the nagios plugin and extract

 Install nagios plugins

 copy the nagios plugins to hosts
Extract
./configure
make 
make install

 4. change the ownership of /usr/local/nagios dir to nagios:nagios
   chown -R nagios:nagios /usr/local/nagios/libexec
####################################################################
Adding nagios remote plugin executor - nrpe
####################################################################

 1. yum install -y gcc glibc glibc-common gd gd-devel make net-snmp openssl-devel

2. Download and Extract

 3. Add user if not already added 

 4. make all
   make install-plugin
   make install-daemon
   make install daemon-config
   make install-xinetd

 5. chown nagios:nagios /usr/local/nagios
   chown -R nagios.nagios /usr/local/nagios/libexec

 6.  vim /etc/xinetd.d/nrpe

 # default: on
# description: NRPE (Nagios Remote Plugin Executor)
service nrpe
{
        flags           = REUSE
        socket_type     = stream
        port            = 5666
        wait            = no
        user            = nagios
        group           = nagios
        server          = /usr/local/nagios/bin/nrpe
        server_args     = -c /usr/local/nagios/etc/nrpe.cfg --inetd
        log_on_failure  += USERID
        disable         = no
        only_from       = 127.0.0.1 192.168.100.18 192.168.100.19
}

 change the only_from parameter and add the nagios server ip address and current server ip address

 7. vim /etc/nrpe

 Add below entry
nrpe            5666/tcp                #NRPE

 8. service xinetd start

 9. check nrpe is working or not

 netstat -at |grep nrpe

 10. check the nrpe is working fine

/usr/local/nagios/libexec/check_nrpe -H bdmashc01

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