Hi jay, I’m reading the script and just found it also works for dhcp agent.
Thanks for your reply. So helpful. Best regards, Nick Ma 2014-1-8 上午3:35于 "Jay Pipes" <jaypi...@gmail.com>写道： > > On Fri, 2014-01-03 at 18:33 +0800, Li Ma wrote: > > > Right, the Neutron L3 agent is the only OpenStack service that is > > > not stateless, and therefore you cannot use traditional > > > load-balancing across a set of identical nodes. > > > > Hi jay, how about dhcp-agent? I've went through the bps of neutron > > for icehouse release. There's no related topics on dhcp-agent. > > > > I wonder how to implement the same functionality of dhcp-agent. > > Hi Li, sorry for the delayed response! > > Technically, the DHCP agent itself does not maintain any state. Rather, > the DHCP agent ensures that a DHCP server (dnsmasq) is running in the > Linux network namespace and providing IP addresses in the tenant's > subnet to the VM's vNIC MAC addresses. The dnsmasq process, running in > the network namespace, *does* save state, though. Unless something has > changed recently, I believe the default behavior of Neutron is to start > a dnsmasq process within the tenant's network namespace on only *one* > DHCP agent. > > However, it is definitely possible to instruct Neutron to place a > dnsmasq process on multiple nodes with a DHCP agent servicing the node. > In fact, in the Chef OpenStack Network cookbook [1] there is a tool > written by Alan Meadows called neutron-ha-tool.py [2] that contains code > [3] that queries Neutron for a list of DHCP agents, and then ensures > that all DHCP agents provide a dnsmasq process for all networks. Check > out the script and you'll see what I mean. We run it in a cron job and > it ensures that if a node running a DHCP agent goes down, that there are > other nodes providing the tenant subnet with DHCP servicing. > > All the best, > -jay > > [1] https://github.com/stackforge/cookbook-openstack-network > [2] > https://github.com/stackforge/cookbook-openstack-network/blob/master/files/default/neutron-ha-tool.py > [3] > https://github.com/stackforge/cookbook-openstack-network/blob/master/files/default/neutron-ha-tool.py#L254 > >
_______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : openstack@lists.openstack.org Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
