Raspberry Pi, Nagios and Nginx monitoring for

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After a series of articles on monitoring tools (Monitorix, Zabbix, RASP-control, RPi-Monitor), a new article on a known tool : Nagios.

If you are using apache, You can go through the repository with the command

apt - get install nagios3

But if you do not want to have a web server relatively heavy, and as I am a fan of Nginx, then you will need to follow these instructions :

1. Update the system

    apt-get update && apt-get upgrade -y

2. Install Nginx with PHP support as explained here.
3. Install the tools for the installation of Nagios

   apt-get install libperl-dev libpng12-dev libgd2-xpm-dev build-essential php5-gd libgd2-xpm

4. Download Nagios

   wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-4.0.2.tar.gz tar zxvf nagios-4.0.2.tar.gz cd nagios-4.0.2

5. The installation will be in need of a user and a group Nagios

   adduser--system--no-create-home--disabled-login--group nagios usermod-a-G nagios www-data

   It adds the Group Nagios secondary group to the user www - data

6. It must also be a user and group for the launch of the commands

   groupadd nagcmd usermod-G nagcmd nagios usermod-a-G nagcmd www-data

   It adds the Group nagcmd secondary group to the user www - data

7. You can start the configuration

   ./configure--prefix/opt/nagios/nagios \
   --sysconfdir = / etc/nagios \
   --with-nagios-user=nagios \
   --with-nagios-group=nagios \
   --with-command-user=nagios \
   --with-command-group=nagcmd

8. Start the compilation

   make all

9. Installer les différents éléments, puis les fichiers de démarrage, de ligne de commande et de configuration

   make install make install-isn't it && make install-commandmode && make install-config cp functions/etc/nagios/

   I copy the file functions required for the startup script in /etc/nagios. Moreover you must modify /etc/init.d/nagios replacing

   . /etc/rc.d/init.d/functions

   by

   . /etc/nagios/functions

10. Install the configuration examples

    make install-config

11. The use of Nginx requires to go through a python script to manage the passwords. The Google friend gave me multiple results but the only convincing :

    cd wget http://Trac.edgewall.org/export/10791/trunk/contrib/htpasswd.py

    The result :
    So for our installation : user nagiosadmin (It is used in the default files), his password password (change of course !)

    Python htpasswd.py-c-b /etc/nagios/htpasswd.users admin password

12. If you have a special email address, It is in the file /etc/Nagios/objects/contacts.cfg what it will take to change it.
13. For your default logs that is defined in the file /etc/Nagios/Nagios.cfg. The value is /opt/Nagios/Nagios/var/Nagios.log. Practice problems.
14. To verify that your configuration is correct :
    /opt/nagios/nagios/bin/nagios v /etc/nagios/nagios.cfg
15. Installer FCGI

    apt-get install spawn-fcgi fcgiwrap

16. Configurer nginx avec le fichier suivant :

    server {
    	listen   8080;
    	server_name nagios;
    	access_log /var/log/nginx/nagios.access.log;
    	error_log /var/log/nginx/nagios.error.log info;
    	root / opt/nagios/nagios/share;
    	index index.php index.html;
            auth_basic "Nagios restricted access";
            auth_basic_user_file /etc/nagios/htpasswd.users;
    	location / stylesheets {
    		alias / opt/nagios/nagios/share/stylesheets;
    	}
    	location / nagios/js {
                    alias / opt/nagios/nagios/share/js;
    	}
    	location/nagios/stylesheets {
                    alias / opt/nagios/nagios/share/stylesheets;
            }
    	rewrite ^ / nagios/images /.(.*)$ /images / $1 break;
            rental ~ .cgi$ {
                    root/opt/nagios/nagios/sbin;
    		rewrite ^ / cgi-bin/nagios3 /.(.*)$ /$1;
    		rewrite ^ / nagios/cgi-bin /.(.*)$ /$1;
     		include/etc/nginx/fastcgi_params;
    		fastcgi_param AUTH_USER $remote_user;
                    fastcgi_param REMOTE_USER $remote_user;
                    fastcgi_param SCRIPT_FILENAME/opt/nagios/nagios/sbin$ fastcgi_script_name;
    		fastcgi_pass unix:/var/run/fcgiwrap.Socket;
            }
    	location ~ .php$ {
                    include/etc/nginx/fastcgi_params;
                    fastcgi_pass unix:/var/run/PHP5-fpm.sock;
            }
    }

17. Enable configuration

    ln-s/etc/nginx/sites-available/nagios/etc/nginx/sites-enabled/nagios

18. Restart Nginx

    service nginx restart

Here you are with your Nagios online ! Appointment with your browser to the port of your configuration. You will need to enter the login nagiosadmin and password you used during the installation :

Bonne surveillance 🙂