Vagrant fail because of a floating IP conflict

[ggiamarchi]

With the following Vagrantfile, before i run vagrant up there is one and only one floating IP allocated but not in use in my tenant. Let's say the IP is 1.2.3.4 and it comes from a floating IP pool named PublicNetwork.

When i run vagrant up, the machine server-1 takes the floating IP 1.2.3.4. Then, the machine server-2 tries to take the same IP and vagrant fails saying the IP is already in use.

Vagrant.configure('2') do |config|

  config.ssh.username = ENV['OS_SSH_USERNAME']

  config.vm.provider :openstack do |os|
    os.openstack_auth_url    = ENV['OS_AUTH_URL']
    os.tenant_name           = ENV['OS_TENANT_NAME']
    os.username              = ENV['OS_USERNAME']
    os.password              = ENV['OS_PASSWORD']
    os.flavor                = ENV['OS_FLAVOR']
    os.image                 = ENV['OS_IMAGE']
  end

  config.vm.define 'server-1' do |s|
    s.vm.provider :openstack do |os|
      os.floating_ip_pool    = 'PublicNetwork'
    end
  end

  config.vm.define 'server-2' do |s|
    s.vm.provider :openstack do |os|
      os.floating_ip         = '1.2.3.4'
    end
  end
end