Install Nagios from Sources in CentOS 6.X

Nagios is software monitoring. It can monitor server uptime, service, and so on. For more details, you can go here.

To install nagios, follow step below:

1. Install dependencies

yum install -y httpd php gcc glibc glibc-common gd gd-devel make net-snmp

2. Create nagios user and group

useradd nagios groupadd nagcmd usermod -G nagcmd nagios usermod -G nagcmd apache

3. Make folder to save nagios installation file and log file

mkdir nagios

4. Download nagios

wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.0.8.tar.gz

5. Extract the source code

tar -xvf nagios-4.0.8.tar.gz

6. Configure nagios

./configure --with-command-group=nagcmd >& /root/nagios/nagios-log/configure.log

7. Compile

make all >& /root/nagios/makeall.log

8. Install nagios core

make install >& /root/nagios/nagios-log/makeinstall.log

9. Install init script

make install-init >& /root/nagios/nagios-log/makeinstallinit.log

10. Install command line mode

make install-commandmode >& /root/nagios/nagios-log/makeinstallcommandmode.log

11. Install sample nagios file

make install-config >& /root/nagios/nagios-log/makeinstallconfig.log

12. Open contact config file

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

13. Search for email and change email alert destination to your email
14. Install nagios web interface

make install-webconf >& /root/nagios/nagios-log/makeinstallwebconfig.log

15. Change htpassword for nagiosadmin and remember this to login into nagios web

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

16. Restart apache daemon

service httpd restart

17. Start nagios service

service nagios start

18. Access your nagios web interface with username nagiosadmin and the password from step 15

http://ip-server/nagios

Source: http://www.tecmint.com/install-nagios-in-linux/