Install Nagios on centos

[root@ADV-CACTISERVER nagios-4.2.0]# make install-init
/usr/bin/install -c -m 755 -d -o root -g root /etc/rc.d/init.d
/usr/bin/install -c -m 755 -o root -g root daemon-init /etc/rc.d/init.d/nagios

*** Init script installed ***

[root@ADV-CACTISERVER nagios-4.2.0]# make install-commandmode
/usr/bin/install -c -m 775 -o nagios -g nagcmd -d /usr/local/nagios/var/rw
chmod g+s /usr/local/nagios/var/rw

*** External command directory configured ***

[root@ADV-CACTISERVER nagios-4.2.0]# make install-config

*** Config files installed ***

Remember, these are *SAMPLE* config files.  You'll need to read

the documentation for more information on how to actually define

services, hosts, etc. to fit your particular needs.

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

here update your mail address

[root@ADV-CACTISERVER nagios-4.2.0]# make install-webconf

/usr/bin/install -c -m 644 sample-config/httpd.conf /etc/httpd/conf.d/nagios.conf

*** Nagios/Apache conf file installed ***

[root@ADV-CACTISERVER nagios-4.2.0]# htpasswd -s -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

New password:

Re-type new password:

Adding password for user nagiosadmin

// here you were set you nagios admin password

# service httpd restart

now check your localhost/nagios

#cd\

#cd nagios-plugings-2.1.2

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

config.status: executing po-directories commands

config.status: creating po/POTFILES

config.status: creating po/Makefile

            --with-apt-get-command:

              --with-ping6-command: /bin/ping6 -n -U -w %d -c %d %s

               --with-ping-command: /bin/ping -n -U -w %d -c %d %s

                       --with-ipv6: yes

                      --with-mysql: no

                    --with-openssl: no

                     --with-gnutls: no

               --enable-extra-opts: yes

                       --with-perl: /usr/bin/perl

             --enable-perl-modules: no

                     --with-cgiurl: /nagios/cgi-bin

               --with-trusted-path: /usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

                   --enable-libtap: no

#make

#make install

[root@ADV-CACTISERVER nagios-plugins-2.1.2]# /usr/local/nagios/bin/nagios -v /us                  r/local/nagios/etc/nagios.cfg

Nagios Core 4.2.0

Copyright (c) 2009-present Nagios Core Development Team and Community Contributo                                                                                        rs

Copyright (c) 1999-2009 Ethan Galstad

Last Modified: 08-01-2016

License: GPL

Website: https://www.nagios.org

Reading configuration data...

   Read main config file okay...

   Read object config files okay...

Running pre-flight check on configuration data...

Checking objects...

        Checked 8 services.

        Checked 1 hosts.

        Checked 1 host groups.

        Checked 0 service groups.

        Checked 1 contacts.

        Checked 1 contact groups.

        Checked 24 commands.

        Checked 5 time periods.

        Checked 0 host escalations.

        Checked 0 service escalations.

Checking for circular paths...

        Checked 1 hosts

        Checked 0 service dependencies

        Checked 0 host dependencies

        Checked 5 timeperiods

Checking global event handlers...

Checking obsessive compulsive processor commands...

Checking misc settings...

Total Warnings: 0

Total Errors:   0

Things look okay - No serious problems were detected during the pre-flight check

# chkconfig --add nagios

# chkconfig --level 35 nagios on

# service nagios start

now again login you web page and check you host http://localhost/nagios

refer