Help with configuring Nagios - server not appearing

Hi there,

I'm an experienced server admin, but somehow managed to avoid Nagios... until now!

The situation is that I have installed Nagios on an Ubuntu 10.04 LTS box to monitor 2 remote machines. I'm pretty sure all the firewalling there is OK to connect to NRPE on the remote machines, but I'm failing at a far more basic level - actually writing the config files!

Here's what I have (IPs masked to protect the innocent...) - and obviously this is a subset of the config files, because that would be really boring...

In

Code:

/etc/nagios3/nagios.cfg

we have loads of stuff which includes some other files and directories, and in particular this:

Code:

# Debian uses by default a configuration directory where nagios3-common,
# other packages and the local admin can dump or link configuration
# files into.
cfg_dir=/etc/nagios3/conf.d

So in that directory I placed a file called (for the sake of argument)

Code:

my_server.cfg

.

The problem is nothing I do seems to make any new hosts appear in the web interface, and I don't know where to start. Help?

For ref, here is the config file for my_server:

Code:

# A simple configuration file for monitoring the local host
# This can serve as an example for configuring other servers;
# Custom services specific to this host are added here, but services
# defined in nagios2-common_services.cfg may also apply.
#

define host{
        use                     generic-host            ; Name of host template to use
        host_name               my_server
        alias                   my_server
        address                 10.11.12.13 ; Not the real IP obviously!
        }

# Define a service to check the disk space of the root partition
# on the local machine.  Warning if < 20% free, critical if
# < 10% free space on partition.

define service{
        use                             generic-service         ; Name of service template to use
        host_name                       my_server
        service_description             Disk Space
        check_command                   check_all_disks!20%!10%
        }



# Define a service to check the number of currently logged in
# users on the local machine.  Warning if > 20 users, critical
# if > 50 users.

define service{
        use                             generic-service         ; Name of service template to use
        host_name                       my_server
        service_description             Current Users
        check_command                   check_users!20!50
        }


# Define a service to check the number of currently running procs
# on the local machine.  Warning if > 250 processes, critical if
# > 400 processes.

define service{
        use                             generic-service         ; Name of service template to use
        host_name                       my_server
        service_description             Total Processes
                check_command                   check_procs!250!400
        }



# Define a service to check the load on the local machine.

define service{
        use                             generic-service         ; Name of service template to use
        host_name                       my_server
        service_description             Current Load
                check_command                   check_load!5.0!4.0!3.0!10.0!6.0!4.0
        }

Thanks in advance,

Neil