Install Nagios on Centos 5

June 22, 2009 | By Fabio Milano In CentOS, Nagios, Tutorial |

Installing Nagios server and network monitoring on Centos 5 server

The official documentation can be found at http://support.nagios.com/knowledge-base/official-documentation

Install necessary packages

yum install httpd gcc glibc glibc-common gd gd-devel php

Create Nagios User account and group

useradd -m nagios

Create nagcmd group for allowing external commands to be submitted through the web interface. Add both the nagios user and the apache user

groupadd nagcmd
usermod -a -G nagcmd nagios
usermod -a -G nagcmd apache

Create Directory to store Nagios installation files

mkdir /opt/Nagios

Download Nagios and Plugins

Save file to directory /opt/Nagios

http://www.nagios.org/download/download.php

As of this writing Nagios 3.0.6 (Stable) and Nagios Plugins 1.4.13 (Stable)

Extract Files:

cd /opt/Nagios

tar xzf nagios-3.0.6.tar.gz

cd nagios-3.0.6

Compile and Configure Nagios

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

Compile Nagios:

make all

Compile binaries, init script, sample config files:

make install

make install-init

make install-config

make install-commandmode

** Do Not Start Nagios **

Nagios has now been installed to the directory /usr/local/nagios/

Install Nagios Web Interface:

make install-webconf

Nagios Web Interface installed to /usr/local/nagios/share ( http conf file added to /etc/httpd/conf.d/nagios.conf )

Create Web Interface Login User:

** This is not the most secure method **

We will create user “nagiosadmin” ( remember the password you assign !)

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

Restart Apache:

service httpd restart

Install Nagios Plugins

Extract Files:

cd /opt/Nagios

tar xzf nagios-plugins-1.4.13.tar.gz

cd nagios-plugins1.4.13

Compile and Configure Nagios Plugins

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

make

make install

Configure nagiosadmin email address for alerts

vi /usr/local/nagios/etc/objects/contacts.cfg

email     nagios@localhost   ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS ******

Verify the sample Nagios configuration files

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

Total Warnings: 0
Total Errors: 0

Start Nagios

Enable Nagios to start at system startup / boot

chkconfig --add nagios

chkconfig nagios on

chkconfig httpd on

Start Nagios

service nagios start

Log into Web Interface

http://ip-address/nagios/

Other Related Posts:

  • Nagios Notifications Error
  • Nagios NRPE add Services to Monitor
  • Nagios NRPE Software RAID Monitor
  • Nagios NRPE Monitor Yum Updates
  • Nagios NRPE LSI Mega RAID

    • 7 Comments so far

    1. Travis on October 7th, 2009

      Great writeup! One additional would be to include php in your yum install line.

      Thanks!

    2. Fabio Milano on October 10th, 2009

      Thank Travis

      Added php to yum install line

    3. painkiller on October 18th, 2009

      Hi

      I do all you wrote, i get no errors but when i try to logging to the Nagios using the web i get 401 error , i use the user and pass i cretaed in the start.

      any ideas?

    4. Fabio Milano on October 22nd, 2009

      401 is authorization error

      issue with /usr/local/nagios/etc/htpasswd.users

      Check permissions of htpasswd.users and also try again

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

    5. feranbe on October 27th, 2009

      It seems it is working so no it is time to play xD

      Thanks a lot!!

    6. Mahabub on February 9th, 2010

      How can i add host on nagios.. Here another problem when i browse like this http://10.156.0.36/nagios…that time when i click on host i saw an error.whats the reason

    7. Nino Francaviglia on February 15th, 2010

      I got the same 401 error but I could navigate to the left pane menu.

      to fix it i did
      #su -l
      #passwd nagios (reset the nagios password)
      #getenforce
      #setenforce 0
      #chcon -R -t httpd_sys_content_t /usr/local/nagios/sbin/
      #chcon -R -t httpd_sys_content_t /usr/local/nagios/share/

      I was able to see the content in the right frame.

      Hope this helps.

      ciao
      Nino

    Leave a reply