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<div class="moz-cite-prefix">One more trick:<br>
<br>
Check /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini for
local_ip value.<br>
<br>
Find local interface with that address (if none found - this is
config bug). run tcpdump -ni THAT_INTERFACE proto gre to see if
some traffic is ever leave compute node. <br>
<br>
Same thing can be done on network node to see if any GRE traffic
is reach it.<br>
<br>
On 29.01.2014 17:25, Alvise Dorigo wrote:<br>
</div>
<blockquote
cite="mid:983C40A2-B1C8-4918-83E2-AB099A95F507@pd.infn.it"
type="cite">
<div>Hello,</div>
<div>I've a distributed installation of OpenStack Havana on 3
different nodes:</div>
<div><br>
</div>
<div> 1. Controller node: nova-api + nova-cert + nova-scheduler +
nova-consoleauth + nova-novncproxy + nova-conductor + keystone +
glance + neutron server + Dashboard</div>
<div><br>
</div>
<div> 2. compute node: nova-compute</div>
<div><br>
</div>
<div> 3. network node: l3-agent + dhcp-agent + metadata-agent</div>
<div><br>
</div>
<div>Of course, on all of them, the l2-agent
(neutron-openvswitch-agent) is also running.</div>
<div><br>
</div>
<div>From the dashboard I created a simple cirros image; then I
launched it and attached to an non-external network (created in
the Admin project, and having its own subnet and dhcp enabled).
Nova assigned an IP to the VM, but actually when the VM's
operating system bootstrapped it couldn't obtain from the DHCP
the assigned IP.</div>
<div><br>
</div>
<div>I monitored the br-int interface on the compute node and on
the network node, using "tcpdump -i br-int".</div>
<div><br>
</div>
<div>I saw the packet traffic going through the two br-int
interfaces (from compute node to network node). But when I
monitored the tapXYZ... in the dhcp network namespace (in the
network node) I didn't see any packet traversing it:</div>
<div><br>
</div>
<div> ip netns exec qdhcpXYZ… "tcpdump -i tap37fgw74frwgc"</div>
<div><br>
</div>
<div>… nothing … :-(</div>
<div><br>
</div>
<div>So, it seems that the DHCP client's request correctly
originates from the VM, and is correctly trasmitted to the
network node by mean of the data network the two br-int
interfaces are connected to; but for some reason the dhcp-agent
doesn't receive anything, as proved by the null traffic on its
tap.</div>
<div><br>
</div>
<div>Any idea about what and how I could more deeply investigate ?</div>
<div><br>
</div>
<div>thanks,</div>
<div>Alvise</div>
<br>
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<br>
<pre wrap="">_______________________________________________
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</pre>
</blockquote>
<br>
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