mjhjmtu

I've just started configuring Nagios from scratch, and I'm new at this.

I've been getting this error after adding objects/printer.cfg

Error: Could not find any hostgroup matching 'allhosts'
(config file '/etc/nagios3/objects/printer.cfg', starting on line 1) 
Error processing object config files!

And this is the content of the printer.cfg

define host
 use generic-host ; Inherit default values from a template 
 host_name Printer_klen ; The name we're giving to this printer 
 alias Printer_klen ; A longer name associated with the printer 
 address 10.1.0.45 ; IP address of the printer 
 hostgroups allhosts ; Host groups this printer is associated with 
 

define service 
 use generic-service ; Inherit values from a template 
 host_name Printer_klen ; The name of the host the service is associated with 
 service_description Printer Status ; The service description 
 check_command check_Printer_klen!-C public ; The command used to monitor the service 
 normal_check_interval 10 ; Check the service every 10 minutes under normal conditions 
 retry_check_interval 1 ; Re-check the service every minute until its final/hard state is determined 
 

define service 
 use generic-service 
 host_name Printer_klen 
 service_description PING 
 check_command check_ping!3000.0,80%!5000.0,100% 
 normal_check_interval 10 
 retry_check_interval 1 
 

The problem

The error is actually pretty self explanatory.

Error: Could not find any hostgroup matching 'allhosts'

You have this line in your define host... block:

hostgroups allhosts ; Host groups this printer is associated with

Solution

You need to create a hostgroup called allhosts.

In the file /etc/nagios/hostgroups.cfg, most likely, you'll need to add a stanza that defines the hostgroup, allhosts.

Example

define hostgroup
 hostgroup_name allhosts
 alias All Hosts