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Rantings and Ravings of the technical sort

Getting Kvm Domain Info Into Puppet Facts

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While I’m yet to find the holy grail of getting a KVM host to be aware of which ‘dom0’ its being hosted on, this bit of ruby for a custom puppet facts is a step there, the other way around:

(vms-running.rb) download
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require 'facter'
begin
        Facter.compute_node
rescue
        Facter.loadfacts()
end


unless  `rpm -qa | grep ruby-libvirt`.empty?
        if (Facter.value("puppet_class_kvm_host") == "true") then
                Facter.add("kvm_vms") do
                        setcode do
                                require 'libvirt'
                                conn = Libvirt::open('qemu:///system')
                                if (conn.num_of_domains == 0 ) then
                                        kvm_vms = "NO VMS"
                                        conn.close
                                        kvm_vms
                                else
                                        vm_doms = Array.new
                                        conn.list_domains.each do |domid|
                                                dom = conn.lookup_domain_by_id(domid)
                                                vm_doms.push(dom.name)
                                        end
                                        vm_doms=vm_doms.join(" ")
                                        conn.close
                                        vm_doms
                                end
                        end
                end
        end
end

Which will return a nice fact like:

kvm_vms => Host1 Host2 Host 3

or if none are running:

kvm_vms => NO VMS

its ugly, but it works!

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