[Openstack-operators] Neutron DHCP failover bug

Sam Morrison sorrison at gmail.com
Wed Sep 30 23:25:03 UTC 2015

> On 30 Sep 2015, at 3:48 pm, John Dewey <john at dewey.ws> wrote:
> Why not run neutron dhcp agents on both nodes? 

Yeah have tried this too.

We don’t do this due to metadata, DHCP adds a static route to the metadata agent (which is the same as the network node running DHCP). If the network node is down the instances loose metadata if they happened to get a lease from that DHCP server. With failover the IP address transfers to the other network node and metadata keeps working for all.

Make sense?


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