[Openstack-operators] [openstack-operators] Neutron HA

Roman Podolyaka rpodolyaka at mirantis.com
Fri Jul 19 13:07:35 UTC 2013

Hi Jacob, all

1. When a new Neutron network is created, it is automatically scheduled to
one of DHCP-agents running in a cluster (actually, it's done lazily, when
the first port on this network is created, but that's an implementation
detail). Though, you have to manually schedule it to additional DHCP-agents
to provide HA. I haven't seen any BPs adding such an option, but I agree,
that it would be useful to have one.

2. Not sure we have one :( The solution from TelekomCloud guys seems to be
the only way to go to provide HA for L3 agents in Active/Active mode

3. Every network or compute node in a cluster runs an L2-agent, which
allows one to create L2 tenant networks and plug VMs/routers/DHCP-servers
into network ports (the underlying implementation depends on the core
plugin you use, e.g. OVS can use VLANs or GRE tunnels to provide tenant
isolation). So L2 networking is ready to use when you've started an
L2-agent and provided it with a correct configuration file.

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