From single flat to multi flat provider network

asked 2014-08-06 03:07:10 -0500

LainesStack gravatar image


we currently have a multi flat provider network neutron setup, we are not using any L3 neutron service, just the dhcp server and the metadata agent. There are currently 8 compute nodes in the initial network. Now we want to expand and have compute nodes in different sub-nets. So this will be a change from single to multi flat provider network.

The sub-nets are routed by a physical router which is also the gateway for the compute nodes and instances. Each sub-net is VLAN taged (by the provider) corresponding to the sub-net. For now we not care about the VLAN tags, its just to give you all information to find the appropriated solution.

  • (VLAN 200) (GW: -> 8 compute nodes + Management Node (Glance, Keystone, Neutron etc.)
  • (VLAN 177) (GW: -> new x compute nodes

Now the questions:

  1. What configuration changes need to be done to change from single to multi "mode"
  2. What about the metadata and the dhcp server, this can not be routed?! How to solve it, IP-Helper address in the router or one neutron installation per sub-net?

Here is the m12 config:

# egrep "^[^#\s]" ml2_conf.ini
type_drivers = local,flat
mechanism_drivers = openvswitch,l2population
flat_networks = *
enable_security_group = True
firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver
enable_tunneling = False
local_ip =
network_vlan_ranges = physnet1
bridge_mappings = physnet1:br-bond1
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