Hello Sascha, Its an multi host nova-network setup depicted there, so nova-network will handle network of its compute node.
While creating a network specify multi-host T , in that case when a machine is created on a compute node bridge would be automatically created on each compute node. Regards, Ritesh nanda -----Original Message----- From: "Sascha Vogt" <[email protected]> Sent: 24-01-2014 07:06 PM To: "[email protected]" <[email protected]> Subject: [Openstack] Havana / nova-network - Multi-Node setup, dnsmasq usesthe same IP on multiple nodes Hi all, I have a Multi-Node, Single-NIC setup. All machines only have a single NIC. I created a virtual network (using gretap tunnels - aka layer2-over-layer3 tunnel) to connect all machines and have one br-int bridge which all VMs are attached to. nova-network runs on all machines and correctly binds dnsmasq to the hosts bridge itself, though I noticed that each host-bridge gets the .1 IP. This seems to work, because dnsmasq is configured by nova-network to only answer to DHCP requests the specific instance has a MAC address for, though I find it a bit irritating. I try to give a picture of it: controller - br-int (dnsmasq with .1 address) - gretap tunnel to compute-1 (using the static IPs of eth0) - gretap tunnel to compute-2 (using the static IPs of eth0) - vnet1-n (instances running on this host) - eth0 (routes between external network and br-int, NAT / ip forwarding active, static IP used also for OpenStack managing) compute-1 - br-int (dnsmasq with .1 address) - gretap tunnel to controller (using the static IPs of eth0) - vnet1-n (instances running on this host) - eth0 (OpenStack managing) compute-2 - br-int (dnsmasq with .1 address) - gretap tunnel to controller (using the static IPs of eth0) - vnet1-n (instances running on this host) - eth0 (OpenStack managing) I'm using the FlatDHCPManager, and if you substitue eth0/the-switch in this picture http://www.mirantis.com/wp-content/uploads/2012/07/flat-dhcp-networking-diagrams-4.png with the gretap tunnels I basically have that topology. In that picture the dnsmasqs/br100 have different IPs. How did they get that? ;) Greetings -Sascha- _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : [email protected] Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
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