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::::::::: <u>'''Version 0.57'''</u>
* Optional web interface for viewing current network status, notification and problem history, log file, etc.
== 2.0 Server Installation (using tarball) ==
This guide will provide you with instructions on how to install Nagios from source (code) on Fedora 13 and have it monitoring your local and client machines.
* Monitor Nagios clients
'''2.2 Prerequisites'''
<code>wget http://prdownloads.sourceforge.net/sourceforge/nagiosplug/nagios-plugins-1.4.15.tar.gz </code>
'''2.5 Compile and Install Nagios'''
4. Install binaries, init script, sample config files and set permissions on the external command directory.
<pre>Note: you You have to be root to issue the following commands.</pre>
<code>make install </code>
<pre>Note: DO NOT start Nagios yet</pre>
'''2.6 Customize Configuration'''
<code>vi /usr/local/nagios/etc/objects/contacts.cfg </code>
<pre>Note: this will be changed to Chris Tyler’s email.</pre>define contact{
contact_name nagiosadmin ; Short name of user
use generic-contact ; Inherit default values from generic-contact template(defined above)
alias Nagios Admin ; Full name of user
email email@learn.senecac.on.ca ; *****CHANGE THIS TO YOUR EMAIL ADDRESS *****
}
</pre>
'''2.7 Configure the Web Interface'''
3. Restart Apache to make the new settings take effect.
<code>service httpd restart</code>
'''2.8 Compile and Install the Nagios Plugins'''
<code>make install</code>
'''2.9 Start Nagios'''
3. If there are no errors, start Nagios. If you got errors, please check nagios.cfg file in step 2, and try it again.
<code>service nagios start </code>
'''2.10 Modify SELinux Settings'''
<code>chcon -R -t httpd_sys_content_t /usr/local/nagios/share/ </code>
'''2.11 Login to the Web Interface'''
Click on the "Service Detail" navigational bar link to see details of what's being monitored on your local machine. It will take a few minutes for Nagios to check all the services associated with your machine, as the checks are spread out over time.
'''2.12 Open Port 5666 on Firewall'''
<code>service iptables save</code>
'''2.13 You're Done'''
1. Create a Nagios_NRPE folder.
<code>mkdir -p ~/Nagios/Nagios_NRPE</code>
2. Add the following at the end of the file:
<pre>define command{
command_name check_nrpe
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}
<code>vi /usr/local/nagios/etc/objects/linux-box-remote.cfg</code>
<pre>Note: Information below is just an example of the template file.</pre>
notification_options d,r
contact_groups admins
register 0 ; DONT DO NOT REGISTER THIS - ITS A TEMPLATE
}
define host{
use linux-box-remote ; Inherit default values from a template host_name Centos5 ; The name we're giving to this server alias Centos5 ; A longer name for the server address 142.204.133.90 ; IP address of the server
}
<code>service nagios restart</code>
== 4.0 Server Installation (using yum utility)==
Make sure you've installed the following packages on your Fedora 13 installation before continuing.
<pre>Note: you You have to be root to install the following packages.</pre>
1. Install the following packages using yum install utility.
<code>yum -y install nrpe </code>
'''4.2 Create Account Information'''
1. While you still have root privilages privileges from a previous step, create a new nagios user account and give it a password.
<code>useradd -m nagios </code>
<code>passwd senecaCdot (your password is here)</code>
2. Create a new nagcmd group for allowing external commands to be submitted through the web interface. Add both the nagios user and the apache user to the group.
<code>usermod -a -G nagcmd apache </code>
'''4.3 Configure the Web Interface'''
1. Create a nagiosadmin account for logging into the Nagios web interface.
<code>htpasswd -c /usr/localetc/nagios/etc/htpasswd.users nagiosadmin </code>
Type the password: (your password is here)
<pre>Note: When you have installed all the required plugins, using the “yum” utility, you will have to exhibit due diligence by ensuring that the “ check_nrpe” “check_nrpe” plugin and check_nagios plugin is are located in the /usr/lib64/nagios/plugins directory. If the check_nrpe plugin is not present you will have to either copy it from a compatible machine that holds it on already contains the its systemappropriateor required plugin(s), or try uninstalling the previous installation of the nagios plugins and proceed to re-installing the plugins again, using yum install. </pre>
1. Open nagios.cfg and edit it with your favourite editor.
#Definitions for monitoring the local (Linux) host
#Definitions for monitoring a Remote (Linux) machine
#Definitions for monitoring second Remote (Linux) machine
</pre>
</pre>
<code>#Allowed_hosts=127.0.0.1</code> is typically altered on the Remote host ONLY changes in IP address that allows a host to access the nrpe daemon system depends on an entitiesentity/organizations network requirements.
<pre>
<code>command[check_load]=/usr/lib64/nagios/plugins/check_load -w 15,10,5 -c 30,25,20</code>
<code>command[check_hda1]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p /dev/$hda1</code>
<code>command[check_zombie_procs]=/usr/lib64/nagios/plugins/check_procs -w 5 -c 10 -s$Z</code>
<code>command[check_total_procs]=/usr/lib64/nagios/plugins/check_procs -w 700 -c 900</code>
<pre>Note: If you're running the NRPE daemon as a standalone daemon you'll need to restart it. If you're running it under (using the inetd/xinetd superserver you don't need to do anything morecommand service nrpe restart).</pre>
'''4.5 Create a command definition'''
<pre>Note: You'll need to create a command definition in one of your Nagios object configuration files in order to use the check_nrpe plugin. Open the sample commands.cfg file for editing...</pre>
<code>vi /usr/localetc/nagios/etcobjects/commands.cfg</code>
and add the following definition to the file:
<code>define command{</code>
<code> command_name check_nrpe</code>
<code> command_line /usr/lib64/nagios/plugins/check_nrpe -H $HOSTADDRESS$ -c $ARG1$</code>
<code>}</code>
You are now ready to start adding services that should be monitored on the remote machine to the Nagios configuration...
'''4.6 Edit the localhost.cfg filelocated in the /etc/nagios/objects directory'''
<pre>Note: The localhost .cfg file can be created from one of the templates.cfg files located in the /etc/nagios/objects directory, here is a brief view of how your localhost.cfg file should appear</pre>
<pre>
define host{
}
1. Edit contacts.cfg file is pretty straight forward and easy to decipher.
<code>vi /usr/localetc/nagios/etc/objects/contacts.cfg</code>
<pre>
define contact{
}
<pre>Note: ScriptAlias directory path will differ based on what version of OS (Operating System) you are running on your machine.</pre>
1. Edit nagios.cfg filelocated in apache (httpd) config files directory.
<code>vi /etc/httpd/conf.d/nagios.cfg </code>
<pre>Note: The current machine has Fedora 13, however, for a machine running Fedora 12 it may differ eg. ScriptAlias /nagios/cgi-bin “/usr/lib64/nagios/cgi-bin/” It's important that these directory paths exist and contain the appropriate content.
</pre>
<code></Directory></code>
'''4.9 Installation On Arm Note: This section highlights a brief snippet of two critical detailed steps REQUIRED for the installation and successful configuration of a Remote host (on an ARM machine) Cdot-guru-4-1(Utilize the installation steps (5.0) that follow this section).'''
<pre>Note: Using the 'yum utility' install the nrpe daemon/ nrpe addon & required plugins</pre>
The nrpe.d directory is located in /etc/nagios/nrpe.d
<code>vi /etc/nagios/nrpe.cfg</code>
Note: Hong Kong has two NICs so the allowed_hosts entry would be entered twice with the two corressponding IPs for both NICs <code>allowed_hosts=<Both the External & Internal IP Address to that of for the monitoring hosts> </code>
comment out the line:
== 5.0 Setting up the Remote Host (using yum utility) ==
<pre>Note: This part section will show how to setup the remote hosst host with the nrpe daemon/nrpe addon & required plugins.</pre>
1. To install the nrpe daemon and nagios plugins run the following commands.
<code>yum -y install nrpe</code>
<code>yum -y install Nagios-plugins-all</code>
2. Open nrpe.cfg and edit it with your favourite editor.
<code>vi /etc/nagios/nrpe.cfg</code>
Add an allowed_hosts IP Address to nrpe.cfg file eg. 142.204.133.123 (chile’s IP Address), but for future configurations Hong Kong's IP Address will be used:
<code> Allowed_hosts=142.204.133.123 </code>
3. Test the nrpe daemon locally using the command:
<code>netstat -at | grep nrpe</code>
<pre>Note: The output of the command should look something like this:
</pre>
4. Add a firewall rule to the INPUT chain - CAVEAT: The ARM machines do not utilize iptables, so the line below may not be required.
<code>iptables -I INPUT -p tcp -m tcp --dport 5666 -j ACCEPT</code>
5. Save the firewall settings so it survives reboot
<code>service iptables save</code>
<pre>
Note: Files locations after install:
</pre>
<code>/usr/local/nagios/libexec/check_nrpe -H localhost -c check_zombie_procs</code>
8. At this point your installation and configuration of both the Nagios monitoring host and Remote host should be completed successfully. First ensure that your apache server and nagios is running on the corresponding monitoring host. To achieve a Frontend (GUI) view of Nagios functionality, go to your browser address field and type in the url-> http://<ip address of monitoring host goes here>/nagios. At the authentication prompt enter the username and password you set during the installation process.
== 5.1 Additional Details ==
<pre>This section will discuss some additional initiatives that were implemented on the Nagios Remote host. Due to the inability to obtain
a plugin that is capable of monitoring mounted devices (on ARM machines) upon boot. A supplemental perl script was identified and
utilize for this purpose. The check_mounted_disks script was conveniently added to /etc/init.d directory, and a few symlinks
(soft links)were linked to appropriate runlevels on the ARM system. Once the system is rebooted the aforementioned script will
execute automatically and perform a verification check of all devices that should be mounted on boot.</pre>
1. Symlinks were created using the command syntax.
<code>
ln -s /etc/init.d/check_mounted_disks /etc/rc/rc2.d/S50check_mounted_disks
ln -s /etc/init.d/check_mounted_disks /etc/rc/rc2.d/K50check_mounted_disks</code>
2. When the check_mounted_disks script is executed on the command line, the following results are exhibited on the display monitor:
<code>
[root@cdot-guru-4-1/]#./check_mounted_disks
"OK: All disks are mounted and persistent"</code>
== 6.0 IRC Notification Bot Configuration (Server configuration) ==
== 7.0 Client Installation ==
'''7.1 Create Account Information on Client Machine'''
<code>yum -y install openssl-devel</code>
3. Instal Plugins: