(Slackware 13.37)

1) Create the nagios group and user-

   groupadd -g 213 nagios
   useradd -u 213 -d /dev/null -s /bin/false -g nagios nagios

1a) Add the 'apache' user to the 'nagios' group, so that it can write to the /var/nagios/rw directory:

   usermod -G nagios apache

2) Install the Nagios::Plugin Perl module-

   cpan -i Nagios::Plugin

3) Use sbopkg and install the following in this order:

• RRDTool
• nagios (currently, the package is nagios-3.3.1.i486-1_SBo)
• nagios-plugin package
• nagios-graphing

3) Edit /etc/nagios/nagios.conf

   Turn off the logging-
        CHANGE: use_syslog=1		TO: use_syslog=0
        CHANGE: log_notifications=1	TO: log_notification=0

4) Edit /etc/httpd/extra/nagios.conf, after the <Directory “/var/www/htdocs/nagios”> line-

   CHANGE: Options None		TO: Options FollowSymLinks

5) Edit /etc/httpd/http.conf

   CHANGE:
   <IfModule dir_module>
   DirectoryIndex index.html
   </IfModule>
   
   TO:
   <IfModule dir_module>
   DirectoryIndex index.html index.php
   </IfModule>

   CHANGE:
   # Uncomment the following line to enable PHP:
   #
   # Include /etc/httpd/mod_php.conf
   
   TO:
   # Uncomment the following line to enable PHP:
   #
   Include /etc/httpd/mod_php.conf

   ADD:
   Include /etc/httpd/extra/nagios.conf

6) Make sure apache starts at boot and start/restart apache-

   chmod 755 /etc/rc.d/rc.httpd
   /etc/rc.d/rc.httpd restart

7) Set the password for nagiosadmin-

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

8) (Not sure if this is necessary but, leaving it in until I can test) Make sure nagios starts at boot and start/restart nagios-

   edit /etc/rc.d/rc.local and add:
        # Start nagios:
        if [ -x /etc/rc.d/rc.nagios ]; then
             echo "Starting nagios..."
             /etc/rc.d/rc.nagios start
        fi
        # Stop nagios:
        if [ -x /etc/rc.d/rc.nagios ]; then
             echo "Stopping nagios..."
             /etc/rc.d/rc.nagios stop
        fi

   make rc.nagios executable:
        chmod 755 /etc/rc.d/rc.nagios

   Start nagios:
        /etc/rc.d/rc.nagios restart

Goto http://YOUR_MACHINE/nagios/ and it should work.

1) Run the htpasswd command for each user-

   htpasswd -c /etc/nagios/htpasswd.users bob
   
   htpasswd -c /etc/nagios/htpasswd.users sue

2) Edit /etc/nagios/cgi.cfg and add the user to:

   authorized_for_all_services=nagiosadmin,bob,sue
   authorized_for_all_hosts=nagiosadmin,bob,sue
   
   (or * for all authenticated users)

* Originally written by arfon