2004-08-30, 01:35 PM
We are going to install Nagios monitoring tool and Nagat for configuring the nagios sctuff. If you search Sourceforge you will see a few different nagat tools that users have written to do different stuff. I am also going to include the nrpe_nt executable, the wincheck_counter (this does command line perfmons on windows) and a vb script that does services up or down state. The great thing about Nagios is you can make your own Plugins for it etc...
This how-to requires apache and php to be installed and configured correctly!
Get nagios and decompress it.
Quote:tar -zxvf nagios-1.2.tar.gz
Make a directory to install Nagios in
Quote:mkdir /usr/local/nagios
You need to add the user and group for nagios.
Quote:groupadd nagiosuseradd -g nagios nagios
Now lets configure the application for installation.
Quote:./configure --prefix=/usr/local/nagios --with-cgiurl=/nagios/cgi-bin --with-htmurl=/nagios/ --with-nagios-user=nagios --with-nagios-grp=nagios
You should see this output:
Quote:*** Configuration summary for nagios 1.2 02-02-2004 ***:
General Options:
-------------------------
Nagios executable: nagios
Nagios user/group: nagios,nagios
Command user/group: nagios,nagios
Embedded Perl: no
Install ${prefix}: /usr/local/nagios
Lock file: ${prefix}/var/nagios.lock
Init directory: /etc/rc.d/init.d
Web Interface Options:
------------------------
HTML URL: [/url]http://localhost/nagios//
CGI URL: [url=http://localhost/nagios/cgi-bin/]http://localhost/nagios/cgi-bin/
Traceroute (used by WAP): /bin/traceroute
External Data Routines:
------------------------
Status data: Default (text file)
Object data: Template-based (text file)
Comment data: Default (text file)
Downtime data: Default (text file)
Retention data: Default (text file)
Peformance data: Default (external commands)
Extended info data: Template-based (text file)
Review the options above for accuracy. If they look okay,
type 'make all' to compile the main program and CGIs.
continue installation:
make all
make install
You can continue with installing Nagios as follows (type 'make'
without any arguments for a list of all possible options):
make install-init
- This installs the init script in /etc/rc.d/init.d
make install-commandmode
- This installs and configures permissions on the
directory for holding the external command file
make install-config
- This installs *SAMPLE* config files in /usr/local/nagios/etc
You'll have to modify these sample files before you can
use Nagios. Read the HTML documentation for more info
on doing this. Pay particular attention to the docs on
object configuration files, as they determine what/how
things get monitored!
Next you have to do the following as it states from the output above.
Quote:make allmake install
make install-init
make install-commandmode
make install-config
The command "make install-config" installs sample config scripts in
Quote:/usr/local/nagios/etc
You need to make the directory read write so you can edit the files with the Nagat configuratoin tool.
Quote:cd /usr/local/nagioschmod 777 etc -R (this is so nagat can write the config files)
Now you need to edit Apache.
Quote:vi /usr/local/apache/conf/httpd.conf
Now insert the following under ScriptAlias.
Quote:#for nagiosScriptAlias /nagios/cgi-bin/ /usr/local/nagios/sbin/
<Directory "/usr/local/nagios/sbin/">
AllowOverride AuthConfig
Options ExecCGI
Order allow,deny
Allow from all
</Directory>
Alias /nagios/ /usr/local/nagios/share/
<Directory "/usr/local/nagios/share">
Options None
AllowOverride AuthConfig
Order allow,deny
Allow from all
</Directory>
Alias /nagiosadmin/ /usr/local/apache/htdocs/nagat/
<Directory "/usr/local/apache/htdocs/nagat/">
Options None
AllowOverride AuthConfig
Order allow,deny
Allow from all
</Directory>
Now you can check the nagios config from the terminal. I like using the tool in Nagat that does the same thing so you can see it in a webpage.
Quote:/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
You can put security on each section of the reporting tool to limit access to it. This is stored in CFG.CGI file.
Quote:htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin
Enter the password when asked. now lets put the .htaccess files in the directories for security.
Quote:vi /usr/local/nagios/share/.htaccessvi /usr/local/nagios/sbin/.htaccess
Enter in this in the .htaccess file.
Quote:AuthName "Nagios Access"AuthType Basic
AuthUserFile /usr/local/nagios/etc/htpasswd.users
require valid-user
Now it is time to install the nagios plugin so you can actually monitor stuff. These are some of the generic default monitoring scripts for like Oracle or cpu etc..
The app is "nagios-plugins-1.4.0alpha1.tar"
Quote:tar -zxvf nagios-plugins-1.4.0alpha1.tar
Now lets compile the plugin.
Quote:./configure --prefix=/usr/local/nagios --with-nagios-user=nagios --with-nagios-group=nagios --with-cgiurl=/nagios/cgi-bin
OK you know the drill with make and make install.
Quote:makemake install
Now if you use Nagat you have to do chmod 777 on the directory with the executable.
Quote:chmod 777 /usr/local/nagios/var/rw/ -R
You need to do the same thing for hte nagios execuable too.
Quote:chmod 777 /usr/local/nagios/bin/ -R
Now lets install NRPE 2.0 so you can execute remote commands on another machine. nrpe-2.0.tar.gz
Quote:tar