Foreman :: Recovering Lost DHCP reservations

Someone asked me today on IRC how to recover his dhcp reservations, as he was using foreman to create those, and his dhcp server died.

Since we are slow on delivering #944, here is a short snippet that would get the job done.

This script validates all DHCP records, if one is missing, it would recreate it.

#! /usr/share/foreman/script/rails runner -e production Host.all.each do |host| next unless host.dhcp? print "#{host}..." dhcp_record = host.dhcp_record if dhcp_record.valid? puts "VALID" elsif dhcp_record.conflicting? puts "CONFLICT" warn "not going to do anything as we found conflicting dhcp records" warn "we wanted #{dhcp_record.attrs.inspect} but found: #{dhcp_record.conflicts.map{|c| c.attrs.inspect}.join(', ')}" else print "missing..recreating.." dhcp_record.create puts "DONE" end end

if you are using 0.5 or newer, simply change the shebang line to be something like:

#!/usr/bin/env /usr/share/foreman/script/rails runner -e production

What about conflicting records?

In the case of a conflict, its possible to do remove the conflicting reservations and simply recreate the correct one.. however, you should be sure you can remove the old ones before..

dhcp_record.conflicts(&:destroy)
dhcp_record.create

Recovering Lost DHCP reservations

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