[ovs-discuss] Quantum : explanation needed about l3-agent et dhcp-agent (because not working)

Chris Wright chrisw at sous-sol.org
Mon Jun 3 20:24:26 UTC 2013


* Benoit ML (ben42ml at gmail.com) wrote:
> I try to deploy an openstack grizzly plate-forme from redhat rdo, in a
> multi-node setup.
> 
> Well recently support of  net namespace was added to rhel 6.4 through the
> rdo repo.
> (One quick note : be carefull about vswitch from rdo, it doesnt support gre
> tunnel).
> 
> So can somebody explain me how works l3-agent and dhcp-agent please ?

I suspect you'll get a better answer from the the openstack list:

 openstack-dev at lists.openstack.org

> I have understand :
> - For a routeur or a dhcp network : quantum create a namespace
> - In this namespace dnsmasq is launched on the interface
> - a peer is created trourgh a "tap" and "ns" interface
> - the tap interface is pushed into the ovs bridge
> 
> My probleme is when a VM start the network can't get any dhcp server .... :(
> 
> I have tested :
> - Openvswitch hypervisor : OK ! With manually configure the IP inside the
> VMs, they can see each other.
> 
> - Tunnel GRE :  OK !  On the network node, i see, with tcpdump on the gre
> interface, the dhcp request from the VM.
> 
> - NameSpace : They exist and  an interface "ns-<idid>" is present with an IP
> 
> - dnsmasq : Inside the namespace the dnsmasq daemon listen on the
> interface, so it s seems ok !
> 
> - Openvswitch "tap" : well the tap is in the bridge ...
> 
> - Link between  tap interface and namespace interface : i see the command
> line inside the log ...
> 
> =>> Well but with tcpdump i didn't see any request on the namespace
> interface ... and of course any dhcp respond ..



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