[Nagios-users] Hostgroup tricks?
Hello
I have a hostgroup defined as:
define hostgroup {
hostgroup_name ping-servers
alias Pingable hosts
members *
}
I have recently added a host outside our firewall that has ping disabled. I
have changed the host's check_command to be 'check_tcp!80' so that the host
won't be offline permanently, but I am wondering if there is a way to exclude
this host from the 'ping-servers' hostgroup in the host definition?
Ideally, something like:
define host {
host_name outsidefirewallhost
alias Host outside firewall
address some.ip.address
use generic-host
hostgroup!ping-servers
}
This generates an error when I test the configuration. The only way I have
been able to achieve this is to change the ping-servers hostgroup definition to
exclude this individual host (*,!outsidefirewallhost), but I'd rather keep the
exclusion define in the host, not in the "blanket rule".
Maybe it's just me being OCD... but is this possible?
Thanks,
Tim
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Re: [Nagios-users] Hostgroup tricks?
Hi Mark
Sorry for the lack of clarity. Learned a valuable lesson in "don't email
before coffee"... :)
I was successful in altering the Host Check Command for the individual host -
that was clear from the documentation.
I am trying to remove this host from the "ping-servers" without altering the
definition for the service or the hostgroup. So right now, the service and
hostgroup's are defined as:
define service {
hostgroup_name ping-servers
service_description PING
check_command check_ping!50.0,20%!100.0,60%
use generic-service,graphed-service
}
define hostgroup {
hostgroup_name ping-servers
alias Pingable hosts
members *
}
And the new host, outsidefirewallhost, I would like to exclude from the
'ping-servers' service - but without modifying the definitions for the service
or the hostrgroup.
I have tried Brandon Phelps' suggestion, but as he found out, Nagios doesn't
like the negation in the host configuration.
I have been successful with this:
define hostgroup {
hostgroup_name ping-servers
alias Pingable hosts
members *,!outsidefirewallhost
}
Should I just get over my personal hang-ups and implement it this way?
Thanks again,
Tim
From: Frost, Mark {PBC} [mailto:mark.fro...@pepsico.com]
Sent: Tuesday, November 08, 2011 8:37 AM
To: Nagios Users List
Subject: Re: [Nagios-users] Hostgroup tricks?
From: Tim AtLee [mailto:t.at...@cfertech.com]
Sent: Tuesday, November 08, 2011 9:46 AM
To: nagios-users@lists.sourceforge.net
Subject: [Nagios-users] Hostgroup tricks?
Hello
I have a hostgroup defined as:
define hostgroup {
hostgroup_name ping-servers
alias Pingable hosts
members *
}
I have recently added a host outside our firewall that has ping disabled. I
have changed the host's check_command to be 'check_tcp!80' so that the host
won't be offline permanently, but I am wondering if there is a way to exclude
this host from the 'ping-servers' hostgroup in the host definition?
Ideally, something like:
define host {
host_name outsidefirewallhost
alias Host outside firewall
address some.ip.address
use generic-host
hostgroup!ping-servers
}
This generates an error when I test the configuration. The only way I have
been able to achieve this is to change the ping-servers hostgroup definition to
exclude this individual host (*,!outsidefirewallhost), but I'd rather keep the
exclusion define in the host, not in the "blanket rule".
Maybe it's just me being OCD... but is this possible?
Thanks,
Tim
Tim,
I'm a little unclear about your question. Are you trying to alter the "Host
Check Command" for a single host definition? That is, the method used by
Nagios to determine if a host is up or not? If that's the case, you can just
override the definition for that one host:
define host {
host_name outsidefirewallhost
alias Host outside firewall
address some.ip.address
check_command check-tcp-port-80
use generic-host
}
Check the docs for information on precedence, but your "generic-host" inclusion
will specify a check_command (usually ping or better yet fping), but defining a
different value in the definition itself can override that for the specific
definition.
If that's not what you mean, and you want to change a specific service to check
everything in that hostgroup except that one host, that would look something
like
define service {
hostgroup_name ping-servers
host_name !outsidefirewallhost
service_description My Service
check_command run-a-ping
use generic-service
}
Hopefully I've understood your question...
Mark
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