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How to convert an ip to string in puppet

asked 2016-08-25 09:04:45 -0600

Edely gravatar image

updated 2016-09-06 09:00:15 -0600

I am using version 3.8 of puppet and I need to convert an ip address to a string. I tried the String function but I am getting an error.

This is the code I am using:

class resolver::params {
  $ip = String($::ipaddress)
  $octs = split($ip, '.')
  file{ '/tmp/teste.txt':
   content => $octs[0]

Here is the output:

Error: Could not retrieve catalog from remote server: Error 400 on SERVER: Syntax error at '('; expected ')' at /etc/puppet/modules/resolver/manifests/params.pp:2 on node Warning: Not using cache on failed catalog Error: Could not retrieve catalog; skipping run

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Don't declare resources in the `params.pp` manifest.

Kai Burghardt gravatar imageKai Burghardt ( 2016-09-03 19:11:06 -0600 )edit

2 Answers

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answered 2016-08-25 14:00:51 -0600

lupin gravatar image

updated 2016-08-26 11:33:51 -0600

You can create a function similar to this.

[root@ha usecase]# cat lib/puppet/parser/functions/ip_to_str.rb

module Puppet::Parser::Functions
  newfunction(:ip_to_str, :type => :rvalue) do |args|

Usage: [root@ha usecase]# tail -6 manifests/init.pp #

class usecase {

  $oct = ip_to_str()
  notify { "${oct}": }

An example output: [root@ha usecase]# facter ipaddress

[root@ha usecase]# puppet apply tests/init.pp Notice: Compiled catalog for ha.home in environment production in 0.02 seconds Notice: 10

Notice: /Stage[main]/Usecase/Notify[10]/message: defined 'message' as '10'

Notice: Finished catalog run in 0.02 seconds

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Thanks. I tried this approach and put the function at resolver/lib/puppet/parser/functions/iptostr.rb And the calling in resolver/manifests/params.pp But now I am getting: Error: Could not retrieve catalog from remote server: Error 400 on SERVER: Unknown function ip_to_str... Could you help, please?

Edely gravatar imageEdely ( 2016-08-26 07:43:21 -0600 )edit

the filename should be 'ip_to_str.rb' - ('ip' underscore 'to' underscore 'str' dot rb).

lupin gravatar imagelupin ( 2016-08-26 11:33:18 -0600 )edit

answered 2016-08-27 09:17:36 -0600

natemccurdy gravatar image

$::ipaddress is already a string, so there's no need to convert it.

Are you just trying to grab a single octet from the IP? If so, you already have the code there to do it...

$octs = split($::ipaddress, '.')
file{ '/tmp/test.txt':
  content => $octs[0]

Also, that error message you're getting is because this line is not valid Puppet code:

$ip = String($::ipaddress) $octs = split($ip, '.')

I'm not sure what you were trying to do there, but In Puppet 3, unless you turn the future parser on, you can't use the uppercase word, String.

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She's in a module's `params.pp`. There are newlines inbetween which aren't displayed here since she didn't marked them up as code/pre.

Kai Burghardt gravatar imageKai Burghardt ( 2016-09-03 19:10:10 -0600 )edit

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Asked: 2016-08-25 09:04:45 -0600

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Last updated: Sep 06 '16