Puppet users - Oct 2009 - template issue: nested variables?

I need to do something like this

node foo {
$iface = pcn0
...

}


# the template

 <%= network_<%= iface %> %>/<% netmask_<%= iface %> %>


The idea being that a file would be built on the client holding the
value of pcn0''s network/netmask

Of course, I''m trying to avoid hard coding the interface name in order
to keep my code portable.

Thanks in advance for any tips
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On 29 Oct 2009, at 1:52 PM, windowsrefund wrote:
> I need to do something like this
>
> node foo {
> $iface = pcn0
> ...
>
> }
>
>
> # the template
>
> <%= network_<%= iface %> %>/<% netmask_<%= iface %>
%>
>
>
> The idea being that a file would be built on the client holding the
> value of pcn0''s network/netmask
>
> Of course, I''m trying to avoid hard coding the interface name in
order
> to keep my code portable.
>
> Thanks in advance for any tips
Here''s the recipe I use for parameterizing on interfaces.  Generally  
speaking, you''ll want to do this only where it''s really
necessary, for
applications that are unavoidably sensitive to network topology.

	# Interface (or alias) whose data we want (eth0, eth0:1, ...)
	$iface = ''eth0''

	# Facter will alphafy the interface name, so we must, too
	$iface_facter = regsubst($iface, ''[:.]'',
''_'', ''G'')

	$address = inline_template("<%= ipaddress_$iface_facter %>")
	if ! $address { fail("Could not get ipaddress of interface $iface") }

N.B. due to the way Facter alphafies interface names, there''s an  
unavoidable limitation when working with network facts that the  
interfaces eth0.1 and eth0:1 are indistinguishable.  (Actually, I''m  
not even sure how Facter behaves in this case.)

-- 
Ian Ward Comfort <icomfort@rescomp.stanford.edu>
Systems Team Lead, Student Computing, Stanford University


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I''ve done a similar thing in my redhat network template, e.g.:

DEVICE=<%= device %>
BOOTPROTO=static
IPADDR=<%= eval("ipaddress_" + device) %>
NETMASK=<%= eval("netmask_" + device) %>
ONBOOT=yes
TYPE=Ethernet
USERCTL=no
HWADDR=<%= eval(" macaddress_" + device) %>
GATEWAY=<%= gateway %>

Hopefully this helps,
Ohad


On Fri, Oct 30, 2009 at 4:52 AM, windowsrefund
<windowsrefund@gmail.com>wrote:
>
> I need to do something like this
>
> node foo {
> $iface = pcn0
> ...
>
> }
>
>
> # the template
>
>  <%= network_<%= iface %> %>/<% netmask_<%= iface %>
%>
>
>
> The idea being that a file would be built on the client holding the
> value of pcn0''s network/netmask
>
> Of course, I''m trying to avoid hard coding the interface name in
order
> to keep my code portable.
>
> Thanks in advance for any tips
> >
>
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