Custom IPAM provider

lzap · April 20, 2018, 8:13am

Hey, are you asking if this technically possible? Yes. Asking if we’ve heard about Solarwinds integration plugin or module? Not me. Implementing your own should not be difficult at all if you really only need IPAM and not full DHCP management (create, delete DHCP reservations).

github.com

theforeman/foreman/blob/develop/app/services/ipam/random_db.rb

module IPAM
  # Internal DB IPAM returning all IPs in random order to minimize race conditions
  class RandomDb < Base
    def generator
      @generator ||= Random.new(mac ? mac.delete(':').to_i(16) : Random.new_seed)
    end

    def random_ip
      IPAddr.new(generator.rand(subnet_range.first.to_i..subnet_range.last.to_i), subnet.family)
    end

    # Safety check not to spend much CPU time when there are no many free IPs left. This gives up
    # in about a second on Ryzen 1700 running with Ruby 2.4.
    MAX_ITERATIONS = 100_000
    def suggest_ip
      iterations = 0
      loop do
        # next random IP from the sequence generated by MAC seed
        candidate = random_ip
        iterations += 1

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