On Fri, Sep 16, 2011 at 09:04:31PM -0400, Gabriel Filion wrote: > hello, > > functions in puppet are always executed on the puppet master. So in your > case, every node gets the same value since you're always basing your > calculation on the puppet master's fqdn.
I certainly appreciate the tip, but I'm fairly sure that the fqdn used is the client's. Every time I kick a client host /tmp/t1 on the puppetmaster changes to the fqdn of that host. As well using my puppetmaster's fqdn as the seed in a separate ruby script gives me a series of random values that doesn't start with 1,1. The "Using Facts and Variables" section of http://docs.puppetlabs.com/guides/custom_functions.html shows how to use lookupvar() to obtain client facts. > You might want to look into transforming your function (master-side) > into a fact (client-side) > > > or, you could also use the builtin function fqdn_rand, which gives you a > random number with the machine's fqdn as a seed for the pseudo-random > number generator. It might save you some work: > > http://docs.puppetlabs.com/references/2.6.8/function.html#fqdnrand I might if I wanted simple random values, but I'm hoping to branch out eventually. Things like "random + 60" or "seed on the fqdn if it contains a certain string, otherwise seed on the hostname only". > On 11-09-16 02:21 PM, Christopher Wood wrote: > > This is using puppet 2.6.2 on Debian Squeeze. > > > > I am attempting to use a custom function in a module to return random > > numbers with the hostname (translated to a number) as the random seed. > > These random numbers can be random values for hour/minute cron, to avoid > > the herd-of-elephants effect when they all run apt-get update daily. > > > > While I'm not experienced with ruby, I've tested the function in a plain > > ruby script and it seems to work. My /tmp/t1 and /tmp/t2 files on the > > puppetmaster (see below) have the expected values in them. I have restarted > > puppetmaster after putting in the function. > > > > How do I get the return value out of my function? > > > > Am I missing anything else obvious? > > > > I am reading from this guide: > > > > http://docs.puppetlabs.com/guides/custom_functions.html > > > > My cheap-as-heck custom function: > > > > $ cat /etc/puppet/modules/yum_apt/lib/puppet/parser/functions/hsrand.rb > > module Puppet::Parser::Functions > > > > newfunction(:hsrand, :type => :rvalue) do |args| > > > > values = Hash[ > > "a" => 1, > > "b" => 2, > > "c" => 3, > > "d" => 4, > > "e" => 5, > > "f" => 6, > > "g" => 7, > > "h" => 8, > > "i" => 9, > > "j" => 10, > > "k" => 11, > > "l" => 12, > > "m" => 13, > > "n" => 14, > > "o" => 15, > > "p" => 16, > > "q" => 17, > > "r" => 18, > > "s" => 19, > > "t" => 20, > > "u" => 21, > > "v" => 22, > > "w" => 23, > > "x" => 24, > > "y" => 25, > > "z" => 26, > > 1 => 1, > > 2 => 2, > > 3 => 3, > > 4 => 4, > > 5 => 5, > > 6 => 6, > > 7 => 7, > > 8 => 8, > > 9 => 9, > > "." => 1, > > "_" => 2, > > "-" => 3, > > ] > > > > string = lookupvar('fqdn') > > > > File.open('/tmp/t1', 'w') {|f| f.write(string) } > > > > stringarray = string.split(//) > > > > File.open('/tmp/t2', 'w') {|f| f.write(stringarray[0]) } > > > > count = 0 > > > > for i in (stringarray) > > if values[i] > > count = count + values[i] > > end > > end > > > > srand(count) > > > > rand = rand(args[0]) > > > > return(rand) > > > > end > > > > end > > > > > > > > In the module's init.pp I attempt to use this in a cron type: > > > > $aptupdater = '/usr/bin/apt-get update' > > > > # some files and stuff in between > > > > cron { 'apt-get-update': > > command => $aptupdater, > > user => 'root', > > hour => hsrand(24), > > minute => hsrand(60), > > ensure => present, > > } > > > > However, the cron job on every lab server ends up as: > > > > # Puppet Name: apt-get-update > > 1 1 * * * /usr/bin/apt-get update > > > > > > I greatly appreciate any assistance. I'm stumped. > > > > -- > Gabriel Filion > -- You received this message because you are subscribed to the Google Groups "Puppet Users" group. To post to this group, send email to puppet-users@googlegroups.com. To unsubscribe from this group, send email to puppet-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/puppet-users?hl=en.
