<br><br><div class="gmail_quote">On Fri, Apr 13, 2012 at 5:34 AM, Vaze, Mandar <span dir="ltr"><<a href="mailto:Mandar.Vaze@nttdata.com">Mandar.Vaze@nttdata.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Dan,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">On similar lines – Currently if nova-network processes are running on
<b>two</b> nodes, only way to set specific network on specific nova-network node is to execute “nova-manage network create” on respective nova-network node. Is that correct ?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">How is the above setup related to “multi-host” ? I found a code comment that “Quantum Manager doesn’t support multi-host”
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I’m copying Vish, as he seems to be expert on multi-host – Reading </span><a href="http://docs.openstack.org/trunk/openstack-compute/admin/content/existing-ha-networking-options.html" target="_blank">http://docs.openstack.org/trunk/openstack-compute/admin/content/existing-ha-networking-options.html</a><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">
, it looks like above is Option 2/Multi-Nic, but not really sure) If yes, how is multi-nic supported by Quantum ?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Additionally – in the above document Vish suggested that each nova-compute must run nova-network – Is that why with QuantumManager – nova-manage executes networking
commands like iptables, dnsmasq locally ?</span></p></div></div></blockquote><div><br></div><div>Yes, as documented Quantum Manager in Essex does not support multi-host. This is why the nova-manage limitation is workable, albiet somewhat inconvenient. </div>
<div><br></div><div>In Folsom, we will support a model that provides the same HA benefits of multi-host, though the implementation will be different, as the L3 forwarding + DHCP functions will be handled by Quantum, not by Nova. </div>
<div><br></div><div>Dan</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Thanks !!<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">-Mandar<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Dan Wendlandt [mailto:<a href="mailto:dan@nicira.com" target="_blank">dan@nicira.com</a>]
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<b>Sent:</b> Thursday, April 12, 2012 9:44 PM<br>
<b>To:</b> Vaze, Mandar<br>
<b>Cc:</b> <a href="mailto:openstack@lists.launchpad.net" target="_blank">openstack@lists.launchpad.net</a>; <a href="mailto:netstack@lists.launchpad.net" target="_blank">netstack@lists.launchpad.net</a><br>
<b>Subject:</b> Re: [Netstack] Role of "nova-manage network" commands when using QuantumManager<u></u><u></u></span></p>
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<p class="MsoNormal">Hi Mandar,<u></u><u></u></p>
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<p class="MsoNormal">Thanks for bringing this up. For Essex, nova-manage commands to create/delete Quantum networks must be run on the nova-network node. For Folsom this will all change, as all networks will be created directly against the Quantum API, rather
than using nova-manage. I'll add a note to the administrator guide, as this is not called there. Thanks!<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Dan<u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">On Thu, Apr 12, 2012 at 1:38 AM, Vaze, Mandar <<a href="mailto:Mandar.Vaze@nttdata.com" target="_blank">Mandar.Vaze@nttdata.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">It is my understanding that in multi-node setup :<u></u><u></u></p>
<p><span style="font-family:Symbol">·</span><span style="font-size:7.0pt">
</span>nova-manage can be executed from any machine which may not be running nova-network process. (Or should nova-manage always be run on nova-network node ?)<u></u><u></u></p>
<p><span style="font-family:Symbol">·</span><span style="font-size:7.0pt">
</span>nova-manage does DB operations and delegates the actual networking calls to nova-network process ?<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Is this understanding correct ?<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">I traced “nova-manage network create” and nova-manage network delete” using FlatDHCPManager (default for devstack/stack.sh)<u></u><u></u></p>
<p class="MsoNormal">Both these calls seem to be doing only DB operations.<u></u><u></u></p>
<p class="MsoNormal">BTW, nova-network process was shutdown during both “network create” and “network delete” – Still both operations were successful.<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">But when using QuantumManager as network manager – nova-manage seems to be doing networking operations like “iptables-save” (during network create) and “kill_dhcp” (during network
delete)<u></u><u></u></p>
<p class="MsoNormal">(via linux-net L3 driver)<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Since nova-manage command may be executed on a host which isn’t running nova-network – network commands like “iptables” and “kill -9 <pid of dnsmasq>” on host running nova-manage
seems incorrect.<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">For the first scenario (iptables-save during “network create” – there is already a defect in LP :
<a href="https://bugs.launchpad.net/nova/+bug/977738" target="_blank">https://bugs.launchpad.net/nova/+bug/977738</a><u></u><u></u></p>
<p class="MsoNormal">and review :
<a href="https://review.openstack.org/6451" target="_blank">https://review.openstack.org/6451</a><u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">I would like your comments and opinions which would help me understand “What nova-manage should and should NOT do”<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Thanks,<u></u><u></u></p>
<p class="MsoNormal">-Mandar<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
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