Puppet users - Sep 2010 - confused about exported resources

I''ve been looking at this example in the puppetdocs.pdf

class nagios-target {
@@nagios_host { $fqdn:
ensure => present,
alias => $hostname,
address => $ipaddress,
use => "generic-host",
}

@@nagios_service { "check_ping_${hostname}":
check_command => "check_ping!100.0,20%!500.0,60%",
use => "generic-service",
host_name => "$fqdn",
notification_period => "24x7",
service_description => "${hostname}_check_ping"
}

}
class nagios-monitor {
package { [ nagios, nagios-plugins ]: ensure => installed, }
service { nagios:
ensure => running,
enable => true,
#subscribe => File[$nagios_cfgdir],
require => Package[nagios],
}

# collect resources and populate /etc/nagios/nagios_*.cfg
Nagios_host <<||>>
Nagios_service <<||>>

How is /etc/nagios/nagios_*.cfg populated using these two exported resources?

A more general question is that I''m confused on the purpose of exported
resources. One of the other examples in the puppetdocs.pdf is

node a {
@@file { "/tmp/foo": content => "fjskfjs\n", tag =>
"foofile", }
}

node b {
File <<| tag == ''foofile'' |>>
}

In this case, wouldn''t you be better off creating the
''/tmp/foo'' resource and placing or including it in your
default node or whichever node you want to apply it to?

--Luke Baker

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On 09/22/2010 09:10 AM, Baker, Luke wrote:
>
> I''ve been looking at this example in the puppetdocs.pdf
>
> class nagios-target {
>
> @@nagios_host { $fqdn:
>
> ensure => present,
>
> alias => $hostname,
>
> address => $ipaddress,
>
> use => "generic-host",
>
> }
>
> @@nagios_service { "check_ping_${hostname}":
>
> check_command => "check_ping!100.0,20%!500.0,60%",
>
> use => "generic-service",
>
> host_name => "$fqdn",
>
> notification_period => "24x7",
>
> service_description => "${hostname}_check_ping"
>
> }
>
> }
>
> class nagios-monitor {
>
> package { [ nagios, nagios-plugins ]: ensure => installed, }
>
> service { nagios:
>
> ensure => running,
>
> enable => true,
>
> #subscribe => File[$nagios_cfgdir],
>
> require => Package[nagios],
>
> }
>
> # collect resources and populate /etc/nagios/nagios_*.cfg
>
> Nagios_host <<||>>
>
> Nagios_service <<||>>
>
> How is /etc/nagios/nagios_*.cfg populated using these two exported 
> resources?
>
That''s the syntax for collecting resources. This is the classic
example-
every node gets the exported resource (the one with @@ in front of it), 
which means it is marked in the database as exported. Then on your 
nagios server you use the collection syntax to collect all the exported 
resources of that type. This means you can auto configure daemons like 
nagios that require node information for the
configuration.
>
> A more general question is that I''m confused on the purpose of 
> exported resources.
>
>
The purpose is to distribute information between nodes. The second 
example you gave is pretty useless, but another common scenario is a 
command and control server that needs the proper host keys for your 
nodes. In each node''s config you would export the ssh key and then 
collect it on the C&C server, that way none of your scripts are failing 
because of the wrong host keys.


--
Joe McDonagh
Operations Engineer
AIM: YoosingYoonickz
IRC: joe-mac on freenode
"When the going gets weird, the weird turn pro."

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