theforeman/foreman-docker

require 'resolv'

module DockerContainerWizardStates
  class Dns < DockerParameter
    belongs_to :environment,  :foreign_key => :reference_id,
                              :inverse_of => :dns,
                              :class_name => 'DockerContainerWizardStates::Environment'
    validates :key, :uniqueness => { :scope => :reference_id },
                     :format => {
                       :with => Regexp.union(Resolv::IPv4::Regex,
                                             Resolv::IPv6::Regex,
                                             /^[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}$/) }
  end
end