Writing your own facter code - puppet

Writing your own facter code - puppet

Puppet agent provides a set of ruby codes and that stay at /usr/lib/ruby/site_ruby/1.8/facter/*.rb. These ruby codes are the one that provides values for facter's output.

[root@test ~]# facter -p

architecture => x86_64

augeasversion => 0.9.0

boardmanufacturer => Intel Corporation

boardproductname => 440BX Desktop Reference Platform

boardserialnumber => None

domain => houston.hp.com

facterversion => 1.6.6

fqdn =>test.hiu.com

hardwareisa => x86_64

hardwaremodel => x86_64

hostname => d9t0578g

id => root

If you stand on the $rubysitedir, /usr/lib/ruby/site_ruby/1.8, you will notice that you can addon more ruby codes to define your own facter parameter and values.

[root@test facter]# pwd

/usr/lib/ruby/site_ruby/1.8/facter

[root@d9t0578g facter]# ls

application.rb       kernel.rb                  puppetversion.rb

architecture.rb      kernelrelease.rb           qpk.rb

arp.rb               kernelversion.rb           rawpartition.rb

augeasversion.rb     lsbmajdistrelease.rb       rubysitedir.rb

Cfkey.rb             lsb.rb                     rubyversion.rb

domain.rb            macaddress.rb              selinux.rb

ec2.rb               macosx.rb                  ssh.rb

facterversion.rb     manufacturer.rb            timezone.rb

fqdn.rb              memory.rb                  uniqueid.rb

hardwareisa.rb       netmask.rb                 uptime_days.rb

hardwaremodel.rb     network.rb                 uptime_hours.rb

hostname.rb          operatingsystem.rb         uptime.rb

id.rb                operatingsystemrelease.rb  uptime_seconds.rb

interfaces.rb        osfamily.rb                util

ipaddress6.rb        path.rb                    virtual.rb

ipaddress.rb         physicalprocessorcount.rb  vlans.rb

iphostnumber.rb      processor.rb               xendomains.rb

kernelmajversion.rb  ps.rb

This is how i wrote my simple facter codes, called raw_partition.

[root@test facter]# cat rawpartition.rb

# Fact: checking the QPK version

Facter.add(:raw_partition) do

        setcode do

                confine :kernel => :linux

                Facter::Util::Resolution.exec("cat /proc/partitions | awk '/sd/ {print $4}' | sed -e 's|sd|/dev/sd|g' | grep -v sda")

        end

end

Basically, you can alter the line that i highlighted and put some meaningful shell script/strings to yield a different output.

The output of this will be like below.

[root@test facter]# facter -p

architecture => x86_64

augeasversion => 0.9.0

boardmanufacturer => Intel Corporation

boardproductname => 440BX Desktop Reference Platform

boardserialnumber => None

.

.

.

raw_partition => /dev/sdd

/dev/sdc

/dev/sdb