On Thursday, May 1, 2014 5:06:37 AM UTC-5, Jonathan Gazeley wrote:
>
> I'm struggling a little bit with this one.
>
> Some of my puppet nodes have lights-out management. For those that do, I
> want to put the IP address of their iLOM card in Hiera and have that
> appear as the notes_url in nagios_host{}.
>
> This works well for hosts that *do* have iLOM, but for those with no
> Hiera variable called ilom I don't want notes_url to be defined at all.
> Setting notes_url => undef doesn't work because it is still written out
> in the nagios config and the url appears clickable, but with no link
> behind it.
Can you present some example code?
Undef is not a value. You cannot store it in a variable, and assigning the
keyword undef as a parameter value is functionally equivalent to not
assigning any value at all. Using undef as a parameter default
affirmatively expresses that the parameter is optional. My guess, then, is
that you have something like this:
define site::managed_host($ilom_ip = undef) {
@@nagios_host{ $title:
notes_url => $ilom_ip,
....
}
}
site::managed_host { $hostname:
ilom_ip => undef
}
# and/or
site::managed_host { $other_hostname:
}
Indeed that won't work. Assigning a variable reference as a parameter
value is never the same thing as assigning undef, even if the variable has
not been assigned a value.
> Setting notes_url => absent actually sets it to the string
> 'absent'.
>
>
Yes, Puppet DSL allows bareword strings. You use them all the time on the
left side of the =>, and other places.
> Is there an elegant way of handling this so my iLOM-able hosts have
> clickable iLOM links in Nagios while the non-iLOM-able hosts don't have
> anything at all?
>
>
I'd need to see your code. The speculative example I present above could
be fixed this way, though:
define site::managed_host($ilom_ip = 'NOTSET') {
@@nagios_host{ $title:
notes_url => $ilom_ip ? { 'NOTSET' => undef, default => $ilom_ip },
....
}
}
or this way:
define site::managed_host($ilom_ip = 'NOTSET') {
if $ilom_ip == 'NOTSET' {
@@nagios_host{ $title:
# no notes_url
....
}
} else {
@@nagios_host{ $title:
notes_url => $ilom_ip,
....
}
}
}
or in other, analogous ways.
John
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