Passing a generated variable inside a template...how?

[Dayton Jones]

I'm writing a template to populate a file - easy enough...

What I want is to to grab the list of interfaces, get the ip assigned to that interface and then do a lookup of the ip to get the dns name.

I'm able to get the interfaces/ips just fine, but can't figure out how to then pass the IP to the function to do the lookup.  Any help is greatly appreciated...

=======================

start ERB

<% scope.lookupvar('interfaces').split(",").each do |interface| %>

<% @int_ip = scope.lookupvar('ipaddress_'+interface) %>

<% @int_name = Resolv.new.getname @int_ip %>

...

<% end %>

end ERB

========================

@int_ip gets popluated and I can manipulate it as needed, but how do I properly pass it to 'Resolv.new.getname' to set the int_name string?

[Denmat]

<%= @int_name = Resolv.new.getname @int_ip %>

??

Maybe this would work better as a custom fact though?

HTH

Den

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[Denmat]

Sorry, ignore my suggestion. That won't work.

On 26 Nov 2015, at 06:57, Dayton Jones <jones....@gmail.com> wrote:

--

[denmat]

Sorry, rushing around on trains. Try this:

irb(main):002:0> require 'resolv'

=> true

irb(main):003:0> Resolv.new.getname('127.0.0.1')

=> "localhost"

[Dayton Jones]

Right, that works -- but I want to get the IP by using the scope.lookup var and not hardcode an IP in the template.  I know both the "scope.lookupvar('ipaddress_'+interface)" and "@int_name = Resolv.new.getname <ip>" works, but I'm struggling on how to send the IP gained from the lookupvar to the Resolv.new.getname function inside the template.. It should just be a syntax issue, but I'm new to ruby/erb  so I'm not sure the correct way to pass a generated string to a function within the same structure... 

[denmat]

okay, this works. 

test.pp

class a {

  $inline = inline_template(

'<% scope.lookupvar("interfaces").split(",").each do |interface| %>

 <% @int_ip = scope.lookupvar("ipaddress_" + interface) %>

 <% @int_name = Resolv.new.getname @int_ip %>

 <%= "#{@int_ip} :::::::: #{@int_name}" %>

 <% end %>')

notify { $inline: }

}

include a

$ puppet apply test.pp

Notice: /Stage[main]/A/Notify[

 10.0.2.15 :::::::: fake.name.net

 172.28.128.5 :::::::: another.faker.net

 127.0.0.1 :::::::: localhost

 ]/

Sorry to mess you around before. Maybe it was your mixing of "'" and """?

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[Dayton Jones]

First, thanks for the help - I've been banging my head against the wall too much on this.

Unfortunately, it's still not working for me..  

I'm not using an inline template, I have an actual .erb file called out in my manifest - though I don't see why this would be any different.

my erb now looks like:

<% scope.lookupvar("interfaces").split(",").each do |interface| %>

<% @int_ip = scope.lookupvar("ipaddress_" + interface) %>

<% @int_name = Resolv.new.getname @int_ip %>

<%= "#{@int_ip} :::::::: #{@int_name}" %>

<% end %>

(thanks, didn't realize I'd mixed up the single/double quotes)

and here is the result when puppet runs and the class is applied:

  Filepath: /usr/lib/ruby/1.8/resolv.rb

  Line: 429

  Detail: cannot interpret as address: 

Is there a difference in using an inline template inside of the class defintion as opposed to using an erb file called as a resource?

[denmat]

No, it is the same for the this test. You do need to have a resolvable IP address for each interface IP it finds or it will error. For example I had to add hostnames in my /etc/hosts file for my vagrant IPs (10.0.2.15, 172.28.128.5). 

That maybe the error you're seeing there, "cannot interpret as address".

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[Dayton Jones]

Yep...the IP's are all resolvable, and if I hardcode one of them in to the Resolv... line, it works and writes to the file... so I have no idea why passing @int_ip to Resolv (instead of the hardcoded IP) fails...

Thanks again for the help...

[Rodent of Unusual Size]

It's probably returning an object. Try resolving @int_ip.to_s

--
Ken Coar
Sanagendamgagwedweinini

[Dayton Jones]

Ok... I switched tactics somewhat and have more or less what I wanted:

=== start ERB file ===
<% @interfaces.split(',').each do |int| if has_variable?("ipaddress_#{int}") -%>
<%= scope["ipaddress_#{int}"] -%> <%= Resolv.getname(scope["ipaddress_#{int}"]) -%>
<% end -%>
<% end -%>
=== end ERB file ===

this will give the the IP and associated FQDN of all the interfaces but I was wondering if the community could give me a little more help..

1) Once I have all the interfaces/names, how can I split the FQDN and get the short name (myhost vs myhost.domain.com)
2) Is there a way to order the output (put 127.0.0.1 at the top, etc)?

[Dayton Jones]

Ah...nevermind, figured this out!

Sorting (well, reverse sorting so lo0 gets put first):
<% @interfaces.split(',').sort!{|x, y| y <=> x}.each do |int| if has_variable?("ipaddress_#{int}") -%>

Splitting:
<% fqdn =  Resolv.getname(scope["ipaddress_#{int}"]) -%>
<% name = (fqdn.split('.')) -%>
<%= scope["ipaddress_#{int}"] -%> <%= fqdn -%> <%= name.first %>