Installing Nagios on centOS

Nagios is (you can cek in here)

Before process installation, make sure the dependency are available onto your machine,

httpd, gcc, gcc-c++, glibc, glibc-common, gd, gd-devel

you can look at this how to install httpd from source, or you can follow in the bellow to install dependency.

*. install dependency .*
with user root run this command:

root@linux:~#yum -y install httpd* gcc gcc-c++  glibc glibc-common gd gd-devel

*. install nagios .*

I. create account for nagios

root@linux:~#useradd -m nagios
root@linux:~#passwd nagios
root@linux:~#groupadd nagcmd
root@linux:~#usermod -a -G nagcmd nagios
root@linux:~#usermod -a -G nagcmd daemon

II. download nagios and plugin packages

root@linux:~#wget ftp://ftp.prz.rzeszow.pl/pub/gentoo/source/distfiles/nagios-3.0.6.tar.gz
root@linux:~#wget http://sourceforge.net/projects/nagiosplug/files/nagiosplug/1.4.14/nagios-plugins-1.4.14.tar.gz/download

III. extract those package

root@linux:~#tar xzvf nagios-3.0.6.tar.gz
root@linux:~#tar xzvf nagios-plugins-1.4.11.tar.gz

IV. compile nagios

oot@linux:~# cd nagios-3.0.6
root@linux: nagios-3.0.6 # ./configure --with-command-group=nagcmd
root@linux: nagios-3.0.6 # make all
root@linux: nagios-3.0.6 # make install
root@linux: nagios-3.0.6 # make install-init
root@linux: nagios-3.0.6 # make install-config
root@linux: nagios-3.0.6 # make install-commandmode
root@linux: nagios-3.0.6 # make install-webconf

IV. create nagiosadmin accout for logging into nagios web interface.

root@linux:nagios-3.0.6 #/usr/local/apache2/bin/htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

the username is : nagiosadmin and input the password as do you want. Please remember the user and password for login on web interface later.

note: on RH4 the command line is :

root@linux:nagios-3.0.6 # htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

V. install plugins

root@linux: ~# cd  nagios-plugins-1.4.11
root@linux: nagios-plugins-1.4.11 # ./configure --with-nagios-user=nagios --with-nagios-group=nagios
root@linux: nagios-plugins-1.4.11 # make
root@linux: nagios-plugins-1.4.11 # make install

note: on RH4, when make install my friends got error like bellow:

make[2]: Entering directory `/root/nagios-plugins-1.4.14/plugins'
test -z "/usr/local/nagios/libexec" || /bin/mkdir -p "/usr/local/nagios/libexec"
/bin/sh ../libtool --mode=install /usr/bin/install -c -o nagios--with-nagios-group=nagios 'check_apt' '/usr/local/nagios/libexec/check_apt'
/usr/bin/install -c -o nagios--with-nagios-group=nagios check_apt /usr/local/nagios/libexec/check_apt
/usr/bin/install: invalid user `nagios--with-nagios-group=nagios'
make[2]: *** [install-libexecPROGRAMS] Error 1
make[2]: Leaving directory `/root/nagios-plugins-1.4.14/plugins'
make[1]: *** [install-am] Error 2
make[1]: Leaving directory `/root/nagios-plugins-1.4.14/plugins'
make: *** [install-recursive] Error 1

to fix that error, repeat starting from command configur like bellow

root@linux:~# cd nagios-3.0.6
root@linux: nagios-3.0.6 # ./configure --with-command-group=nagcmd
root@linux: nagios-3.0.6 # make all
root@linux: nagios-3.0.6 # make instal

VI. verify nagios configuration

root@linux: ~# /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

if there are not error, configure is true

VII. start nagios service

root@linux: ~ # chkconfig --add nagios
root@linux: ~ # chkconfig nagios on
root@linux: ~ # /etc/init.d/nagios

VIII. Edit file httpd.conf add the line bellow on # Supplemental configuration part

root@linux: ~ # vi /usr/local/apache2/conf/httpd.conf

#nagios
Include /etc/httpd/conf.d/nagios.conf

note : on RH4, if you are using apache old version, you can ignore part VIII

IX. restart apache service

and then you can cek or you can acces nagios web interface with your browser on http://yourdomain.com/nagios

input user and password

Thanks for the_mean aKa satria  who practices's friends and tox_penguin aKa Totok for your documentation :)