<div dir="ltr">If we have ports without IPs, I don't think we need a placeholder, do we? Wouldn't a port without an IP address be the same thing as a port with a placeholder indicating that it doesn't have an IP address?</div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Feb 3, 2015 at 8:57 AM, John Belamaric <span dir="ltr"><<a href="mailto:jbelamaric@infoblox.com" target="_blank">jbelamaric@infoblox.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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<div>Hi Paddu,</div>
<div><br>
</div>
<div>I think this is less an issue of the pluggable IPAM than it is the Neutron management layer, which requires an IP for a port, as far as I know. If the management layer is updated to allow a port to exist without a known IP, then an additional IP request
type could be added to represent the placeholder you describing.</div>
<div><br>
</div>
<div>However, doing so leaves IPAM out of the hands of Neutron and out of the hands of the external (presumably authoritative) IPAM system. This could lead to duplicate IP issues since each VM is deciding its own IP without any centralized coordination. I wouldn't
recommend this approach to managing your IP space.</div>
<div><br>
</div>
<div>John</div>
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<span style="font-weight:bold">From: </span>Padmanabhan Krishnan <<a href="mailto:kprad1@yahoo.com" target="_blank">kprad1@yahoo.com</a>><br>
<span style="font-weight:bold">Reply-To: </span>Padmanabhan Krishnan <<a href="mailto:kprad1@yahoo.com" target="_blank">kprad1@yahoo.com</a>><br>
</span><span style="font-weight:bold">Date: </span>Wednesday, January 28, 2015 at 4:58 PM<br>
<span style="font-weight:bold">To: </span>John Belamaric <<a href="mailto:jbelamaric@infoblox.com" target="_blank">jbelamaric@infoblox.com</a>>, "OpenStack Development Mailing List (not for usage questions)" <<a href="mailto:openstack-dev@lists.openstack.org" target="_blank">openstack-dev@lists.openstack.org</a>><span class=""><br>
<span style="font-weight:bold">Subject: </span>Re: [openstack-dev] [Neutron] fixed ip info shown for port even when dhcp is disabled<br>
</span></div>
<div><br>
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<div>
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<div dir="ltr"></div>
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<div>Some follow up questions on this.</div>
<div><br>
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<div dir="ltr">In the specs, i see that during a "create_port", there's provisions to query the external source by "Pluggable IPAM" to return the IP.</div>
</div>
<div>
<div>This works fine for cases where the external source (say, DHCP server) can be queried for the IP address when a launch happens.</div>
<div><br>
</div>
<div dir="ltr">Is there a provision to have the flexibility of a "late IP assignment"?</div>
<div dir="ltr"><br>
</div>
</div>
<div>I am thinking of cases, like the temporary unavailability of external IP source or lack of standard interfaces in which case data packet snooping is used to find the IP address of a VM after launch.
Something similar to late binding of IP addresses.</div>
<div>
<div dir="ltr">This means the create_port may not get the IP address from the pluggable IPAM. In that case, launch of a VM (or create_port) shouldn't fail. The Pluggable IPAM should have some provision to return something
equivalent to "unavailable" during create_port and be able to do an update_port when the IP address becomes available.</div>
</div>
<div><br clear="none">
</div>
<div>I don't see that option. Please correct me if I am wrong.</div>
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</div>
<div>Thanks,</div>
<div>Paddu <br>
</div><div><div class="h5">
<div><br>
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<div dir="ltr"><font face="Arial">On Thursday, December 18, 2014 7:59 AM, Padmanabhan Krishnan <<a href="mailto:kprad1@yahoo.com" target="_blank">kprad1@yahoo.com</a>> wrote:<br>
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<div>Hi John,</div>
<div dir="ltr">Thanks for the pointers. I shall take a look and get back.</div>
<div dir="ltr"><br clear="none">
</div>
<div dir="ltr">Regards,</div>
<div dir="ltr">Paddu<br clear="none">
</div>
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<div dir="ltr"><font face="Arial">On Thursday, December 18, 2014 6:23 AM, John Belamaric <<a href="mailto:jbelamaric@infoblox.com" target="_blank">jbelamaric@infoblox.com</a>> wrote:<br clear="none">
</font></div>
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<div>Hi Paddu,</div>
<div><br clear="none">
</div>
<div>Take a look at what we are working on in Kilo [1] for external IPAM. While this does not address DHCP specifically, it does allow you to use an external source to allocate the IP that OpenStack uses, which may solve your problem.</div>
<div><br clear="none">
</div>
<div>Another solution to your question is to invert the logic - you need to take the IP allocated by OpenStack and program the DHCP server to provide a fixed IP for that MAC.</div>
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</div>
<div>You may be interested in looking at this Etherpad [2] that Don Kehn put together gathering all the various DHCP blueprints and related info, and also at this BP [3] for including a DHCP relay so we can utilize external DHCP more easily.</div>
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<div>
<div>[1] <a href="https://blueprints.launchpad.net/neutron/+spec/neutron-ipam" target="_blank">https://blueprints.launchpad.net/neutron/+spec/neutron-ipam</a></div>
</div>
<div>[2] <a href="https://etherpad.openstack.org/p/neutron-dhcp-org" target="_blank">https://etherpad.openstack.org/p/neutron-dhcp-org</a></div>
<div>[3] <a href="https://blueprints.launchpad.net/neutron/+spec/dhcp-relay" target="_blank">https://blueprints.launchpad.net/neutron/+spec/dhcp-relay</a></div>
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<div>John</div>
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<span style="font-weight:bold">From: </span>Padmanabhan Krishnan <<a rel="nofollow" shape="rect" href="mailto:kprad1@yahoo.com" target="_blank">kprad1@yahoo.com</a>><br clear="none">
<span style="font-weight:bold">Reply-To: </span>Padmanabhan Krishnan <<a rel="nofollow" shape="rect" href="mailto:kprad1@yahoo.com" target="_blank">kprad1@yahoo.com</a>>, "OpenStack Development Mailing List (not for usage
questions)" <<a rel="nofollow" shape="rect" href="mailto:openstack-dev@lists.openstack.org" target="_blank">openstack-dev@lists.openstack.org</a>><br clear="none">
<span style="font-weight:bold">Date: </span>Wednesday, December 17, 2014 at 6:06 PM<br clear="none">
<span style="font-weight:bold">To: </span>"<a rel="nofollow" shape="rect" href="mailto:openstack-dev@lists.openstack.org" target="_blank">openstack-dev@lists.openstack.org</a>" <<a rel="nofollow" shape="rect" href="mailto:openstack-dev@lists.openstack.org" target="_blank">openstack-dev@lists.openstack.org</a>><br clear="none">
<span style="font-weight:bold">Subject: </span>Re: [openstack-dev] [Neutron] fixed ip info shown for port even when dhcp is disabled<br clear="none">
</div>
<div><br clear="none">
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<div style="color:#000;background-color:#fff;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:13px">
<div dir="ltr"><span>This means whatever tools the operators are using, it need to make sure the IP address assigned inside the VM matches with Openstack has
assigned to the port.</span></div>
<div dir="ltr"><span>Bringing the question that i had in another thread on the same topic:</span></div>
<div dir="ltr"><br clear="none">
<span></span></div>
<div dir="ltr"><span>If one wants to use the provider DHCP server and not have Openstack's DHCP or L3 agent/DVR, it may not be possible to do so even with
DHCP disabled in Openstack network. Even if the provider DHCP server is configured with the same start/end range in the same subnet, there's no guarantee that it will match with Openstack assigned IP address for bulk VM launches or when there's a failure
case.</span></div>
<div dir="ltr"><span>So, how does one deploy external DHCP with Openstack?</span></div>
<div dir="ltr"><span><br clear="none">
</span></div>
<div dir="ltr"><span>If Openstack hasn't assigned a IP address when DHCP is disabled for a network, can't port_update be done with the provider DHCP specified
IP address to put the anti-spoofing and security rules?</span></div>
<div dir="ltr"><span></span></div>
<div dir="ltr">With Openstack assigned IP address, port_update cannot be done since IP address aren't in sync and can overlap.</div>
<div dir="ltr"><br clear="none">
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<div dir="ltr">Thanks,</div>
<div dir="ltr">Paddu<br clear="none">
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On 12/16/14 4:30 AM, "Pasquale Porreca" <<a rel="nofollow" shape="rect" href="mailto:pasquale.porreca@dektech.com.au" target="_blank">pasquale.porreca@dektech.com.au</a>><br clear="none">
wrote:<br clear="none">
<br clear="none">
>I understood and I agree that assigning the ip address to the port is<br clear="none">
>not a bug, however showing it to the user, at least in Horizon dashboard<br clear="none">
>where it pops up in the main instance screen without a specific search,<br clear="none">
>can be very confusing.<br clear="none">
><br clear="none">
>On 12/16/14 12:25, Salvatore Orlando wrote:<br clear="none">
>> In Neutron IP address management and distribution are separated<br clear="none">
>>concepts.<br clear="none">
>> IP addresses are assigned to ports even when DHCP is disabled. That IP<br clear="none">
>> address is indeed used to configure anti-spoofing rules and security<br clear="none">
>>groups.<br clear="none">
>> <br clear="none">
>> It is however understandable that one wonders why an IP address is<br clear="none">
>>assigned<br clear="none">
>> to a port if there is no DHCP server to communicate that address.<br clear="none">
>>Operators<br clear="none">
>> might decide to use different tools to ensure the IP address is then<br clear="none">
>> assigned to the instance's ports. On XenServer for instance one could<br clear="none">
>>use a<br clear="none">
>> guest agent reading network configuration from XenStore; as another<br clear="none">
>> example, older versions of Openstack used to inject network<br clear="none">
>>configuration<br clear="none">
>> into the instance file system; I reckon that today's configdrive might<br clear="none">
>>also<br clear="none">
>> be used to configure instance's networking.<br clear="none">
>> <br clear="none">
>> Summarising I don't think this is a bug. Nevertheless if you have any<br clear="none">
>>idea<br clear="none">
>> regarding improvements on the API UX feel free to file a bug report.<br clear="none">
>> <br clear="none">
>> Salvatore<br clear="none">
>> <br clear="none">
>> On 16 December 2014 at 10:41, Pasquale Porreca <<br clear="none">
>> <a rel="nofollow" shape="rect" href="mailto:pasquale.porreca@dektech.com.au" target="_blank">
pasquale.porreca@dektech.com.au</a>> wrote:<br clear="none">
>>><br clear="none">
>>> Is there a specific reason for which a fixed ip is bound to a port on a<br clear="none">
>>> subnet where dhcp is disabled? it is confusing to have this info shown<br clear="none">
>>> when the instance doesn't have actually an ip on that port.<br clear="none">
>>> Should I fill a bug report, or is this a wanted behavior?<br clear="none">
>>><br clear="none">
>>> --<br clear="none">
>>> Pasquale Porreca<br clear="none">
>>><br clear="none">
>>> DEK Technologies<br clear="none">
>>> Via dei Castelli Romani, 22<br clear="none">
>>> 00040 Pomezia (Roma)<br clear="none">
>>><br clear="none">
>>> Mobile <a href="tel:%2B39%203394823805" value="+393394823805" target="_blank">+39 3394823805</a><br clear="none">
>>> Skype paskporr<br clear="none">
>>><br clear="none">
>>> _______________________________________________<br clear="none">
>>> OpenStack-dev mailing list<br clear="none">
>>> <a rel="nofollow" shape="rect" href="mailto:OpenStack-dev@lists.openstack.org" target="_blank">
OpenStack-dev@lists.openstack.org</a><br clear="none">
>>> <a rel="nofollow" shape="rect" href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev" target="_blank">
http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev</a><br clear="none">
>>><br clear="none">
>> <br clear="none">
>> <br clear="none">
>> <br clear="none">
>> _______________________________________________<br clear="none">
>> OpenStack-dev mailing list<br clear="none">
>> <a rel="nofollow" shape="rect" href="mailto:OpenStack-dev@lists.openstack.org" target="_blank">
OpenStack-dev@lists.openstack.org</a><br clear="none">
>> <a rel="nofollow" shape="rect" href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev" target="_blank">
http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev</a><br clear="none">
>> <br clear="none">
><br clear="none">
>-- <br clear="none">
>Pasquale Porreca<br clear="none">
><br clear="none">
>DEK Technologies<br clear="none">
>Via dei Castelli Romani, 22<br clear="none">
>00040 Pomezia (Roma)<br clear="none">
><br clear="none">
>Mobile <a href="tel:%2B39%203394823805" value="+393394823805" target="_blank">+39 3394823805</a><br clear="none">
>Skype paskporr<br clear="none">
><br clear="none">
>_______________________________________________<br clear="none">
>OpenStack-dev mailing list<br clear="none">
><a rel="nofollow" shape="rect" href="mailto:OpenStack-dev@lists.openstack.org" target="_blank">OpenStack-dev@lists.openstack.org</a><br clear="none">
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