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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt">发件人<span lang="EN-US">:</span></span></b><span lang="EN-US" style="font-size:10.0pt"> Sergey Kraynev [mailto:skraynev@mirantis.com]
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</span><b><span style="font-size:10.0pt">发送时间<span lang="EN-US">:</span></span></b><span lang="EN-US" style="font-size:10.0pt"> 2014</span><span style="font-size:10.0pt">年<span lang="EN-US">4</span>月<span lang="EN-US">17</span>日<span lang="EN-US"> 15:35<br>
</span><b>收件人<span lang="EN-US">:</span></b><span lang="EN-US"> OpenStack Development Mailing List (not for usage questions)<br>
</span><b>主题<span lang="EN-US">:</span></b><span lang="EN-US"> Re: [openstack-dev] [Heat][Nova][Neutron]Detach interface will delete the port<o:p></o:p></span></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Hello Huang.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">You are right, that this problem is presented in networks update for OS::Nova::Server. I have known about it, and I wanted to discuss it with Steve Baker, but possibly forgot to do it. Thank you, that you raise this thread.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">About issue.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">The cause why it happens is simple: when nova calls detach_interface, port will be detached and deleted at all.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">I think there are two solutions:<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">First:
<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Heat get the port information before to “detach”, and to create the port again before to “attach”.
<o:p></o:p></span></p>
<p><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">But I think it looks ugly and will increase risk failure for re-create.</span><span lang="EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">I agree that it's not useful solution. This approach has a lot of bad sides and one of them :<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"> - if you update only server, your other resources should stay without changes, but in this case port will be recreated. (so it will be new different resource)<span style="color:#1F497D"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Second:<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Neutron provide a detach_port api to nova, so that nova provide the real “detach” not “delete” to heat.<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">I have told with folk from neutron team and they told me that neutron does not have such api and it's not possible to do this thing.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">So I think, that problem should be solved in nova. F.e. will be good to provide detach_interface command with additional flag delete_port=True. (some kind of soft detach).<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">In this case we could use existing port after detaching.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D">------<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D">
</span><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">We discuss it in our team, it’s relate to server_delete also, if we update the stack just to delete the server, the port will be deleted too.
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:18.0pt"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">So if we want to solve the problem in nova, the process of delete instance need to modify. May be need to modify the server_delete api
to add a flag too.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D"> But this change seems provide to heat only. And may be it’s not easy to do</span><span lang="EN-US" style="font-family:Wingdings;color:#1F497D">J</span><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Sergey.<o:p></o:p></span></p>
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