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<div>David,</div>
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<div>Maybe I misunderstand your question but I would expect this behavior. The "force_dhcp_release" flag says 'send a DHCP release to the DHCP server'. This doesn't mean that the IP is immediately available for use as it is still associated with the instance
UUID in the nova database. The "fixed_ip_disassociate_timeout" flag disassociates the IP from the relevant instance in the nova.fixed_ips table after the specified time.</div>
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<div>Useful link:</div>
<div><a href="http://docs.openstack.org/folsom/openstack-compute/admin/content/list-of-compute-config-options.html">http://docs.openstack.org/folsom/openstack-compute/admin/content/list-of-compute-config-options.html</a></div>
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<div>Thanks,</div>
<div>Kevin</div>
<div>Rackspace</div>
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<span style="font-weight:bold">From: </span>David Hill <<a href="mailto:david.hill@ubisoft.com">david.hill@ubisoft.com</a>><br>
<span style="font-weight:bold">Date: </span>Friday, March 22, 2013 12:59 PM<br>
<span style="font-weight:bold">To: </span>"<a href="mailto:openstack@lists.launchpad.net">openstack@lists.launchpad.net</a>" <<a href="mailto:openstack@lists.launchpad.net">openstack@lists.launchpad.net</a>><br>
<span style="font-weight:bold">Subject: </span>[Openstack] DHCP release<br>
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<p class="MsoNormal"><span lang="EN-CA">Hi guys,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"> I’m experiencing some kind of weird behaviour with our openstack setup here.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Let me explain:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">I create an instance that gets an IP: 172.0.0.3<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">I destroy the instance.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">I recreate an instance that will get another IP: 172.0.0.4.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">If I wait 600 seconds between each test, 172.0.0.3 will be attributed again instead of 172.0.0.4.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Would it be possible that the IP de-allocation relies on the periodic task to do some clean up?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">I’m asking because actually this doesn’t work:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">force_dhcp_release=true<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">dhcp_lease_time=604800<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">fixed_ip_disassociate_timeout=1209600<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">If I do this and stress test my lab, I will eventually run out of IPs!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">But this works:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">force_dhcp_release=true<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">dhcp_lease_time=604800<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">fixed_ip_disassociate_timeout=600<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">I will eventually start seeing my previously attributed IP address instead of running out of IPs.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Am I reading an old document that is outdated?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Thank you very much,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Dave<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"><o:p> </o:p></span></p>
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