Installing Nagios and Munin

Login to Nagios server (where you want to install Nagios Server)

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Apache Instalation

sudo apt-get install apache2

sudo apt-get install libapache2-mod-php5

sudo apt-get install build-essential

sudo apt-get install libgd2-xpm-dev


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Create Account Information

Become the root user.

sudo -s

Password123


Create a new nagios user account and give it a password.

/usr/sbin/useradd -m -s /bin/bash nagios

passwd nagios

Enter new UNIX password:nagiosadmin
Retype new UNIX password:nagiosadmin
passwd: password updated successfully

root@stg-monitor:~# /usr/sbin/groupadd nagcmd
root@stg-monitor:~# /usr/sbin/usermod -a -G nagcmd nagios
root@stg-monitor:~# /usr/sbin/usermod -a -G nagcmd www-data

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Download the tar ball for Nagios and Nagios Plugins


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Configure


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


*** Configuration summary for nagios 3.2.3 10-03-2010 ***:

 General Options:
 -------------------------
        Nagios executable:  nagios
        Nagios user/group:  nagios,nagios
       Command user/group:  nagios,nagcmd
            Embedded Perl:  no
             Event Broker:  yes
        Install ${prefix}:  /usr/local/nagios
                Lock file:  ${prefix}/var/nagios.lock
   Check result directory:  ${prefix}/var/spool/checkresults
           Init directory:  /etc/init.d
  Apache conf.d directory:  /etc/apache2/conf.d
             Mail program:  /bin/mail
                  Host OS:  linux-gnu

 Web Interface Options:
 ------------------------
                 HTML URL:  http://localhost/nagios/
                  CGI URL:  http://localhost/nagios/cgi-bin/
 Traceroute (used by WAP):


Review the options above for accuracy.  If they look okay,
type 'make all' to compile the main program and CGIs.


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Compile the Nagios source code.

make all


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Install binaries, init script, sample config files and set permissions on the external command directory.

make install

make install-init

make install-config

make install-commandmode


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Configure the Web Interface

Install the Nagios web config file in the Apache conf.d directory.

make install-webconf


Create a nagiosadmin account for logging into the Nagios web interface. Remember the password you assign to this account - you'll need it later.

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

New password:nagios
Re-type new password:nagios


Restart Apache to make the new settings take effect.

/etc/init.d/apache2 reload

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Compile and Install the Nagios Plugins

cd /home/cybage/untar/nagios-plugins-1.4.11


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

make

make install

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Configure Nagios to automatically start when the system boots.

ln -s /etc/init.d/nagios /etc/rcS.d/S99nagios


Verify the sample Nagios configuration files.

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


If there are no errors, start Nagios.

/etc/init.d/nagios start


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Check Nagios web interface at

http://monitor.dimestore.com/nagios/

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Configure NRPE plugins on PROD-Monitor server



NRPE require you install xinetd and libssl-dev so we’ll do that now

apt-get install xinetd
apt-get install libssl-dev


/home/cybage/untar/nrpe-2.12


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


now we need to configure the daemon so it will talk to our Nagios server, well do this buy editing /etc/xinetd.d/nrpe and adding our monitoring servers address:

only_from       = ??.??.??.??


Then add “nrpe 5666/tcp # NRPE” to /etc/services as below

nrpe            5666/tcp                        # NRPE


Restart xinetd services

root@prod-monitor:~/untar/nrpe-2.12# /etc/init.d/xinetd restart
 * Stopping internet superserver xinetd                                                                                                               [ OK ]
 * Starting internet superserver xinetd                                                                                                               [ OK ]

Confirm NRPE is listening on port 5666

root@prod-monitor:~/untar/nrpe-2.12# netstat -at | grep nrpe
tcp        0      0 *:nrpe                  *:*                     LISTEN


Confirm check_nrpe is present in the Nagios libexec folder

ls -l /usr/local/nagios/libexec/check_nrpe

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edit Nagios configuration to replace the localhost with actual nagios host name and new required cfg files

cd /usr/local/nagios/etc/objects/

sudo touch hosts.cfg services.cfg hostgroups.cfg


edit nagios.cfg so that nagios can use these newly added configuration files

and comment the localhosts.cfg file

cfg_file=/usr/local/nagios/etc/objects/hosts.cfg
cfg_file=/usr/local/nagios/etc/objects/hostgroups.cfg
cfg_file=/usr/local/nagios/etc/objects/contactgroups.cfg
cfg_file=/usr/local/nagios/etc/objects/services.cfg



Verify the sample Nagios configuration files.

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


If there are no errors, reload Nagios.

sudo /etc/init.d/nagios reload

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Installing Munin and munin node

sudo apt-get install munin munin-node


edit munin.conf file and replace localhost with proper name

[prod-monitor]
    address ??.??.??.??
    use_node_name yes


and update the Munin server

sudo su - munin --shell=/bin/bash  -c /usr/share/munin/munin-update

update munin-node.conf  to add munin servers ip address

allow ^127\.0\.0\.1$
allow ^??\.??\.??\.??$


and restart munin node

sudo service munin-node restart

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Add munin nodes in munin.conf


Restart Munin
sudo su - munin --shell=/bin/bash -c /usr/share/munin/munin-update


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Add entries in hosts.cfg
Add entries in hostgroups.cfg


Verify the sample Nagios configuration files.

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

sudo /etc/init.d/nagios reload

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Add nrpe command in commands.cfg

define command{
        command_name check_nrpe
        command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}


Add NRPE services