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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">Dear David,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D"> From the meeting minutes, some of my colleagues here in ITRI think the openstack hackathon platform will use container instead of KVM. Could you verify if that
was true? If that’s the case, I was just want to raise that live migration is not supported when container is used by nova compute.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D"> I used JuJu+MAAS to deploy my OpenStack HA deployment. In my controller, I deploy the openstack components into LXC containers. And I do need to adjust some kernel
parameters to get the components to work properly under the physical host’s containers. So, this experience is related to Openstack deployment, not hackathon application.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D">EJ
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> David F Flanders [mailto:flanders@openstack.org]
<br>
<b>Sent:</b> Monday, January 11, 2016 2:15 PM<br>
<b>To:</b> </span><span style="font-size:10.0pt">張裕杰</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""><br>
<b>Cc:</b> openstack-tw@lists.openstack.org<br>
<b>Subject:</b> Re: [openstack-tw] Using container in Hackathon<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Tahoma","sans-serif";color:#444444">Dear EJ,<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Tahoma","sans-serif";color:#444444"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Tahoma","sans-serif";color:#444444">Do you have an idea for an app which will utilise live container migration, or are you raising "container migration" as a potential risk for the hackathon?<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Tahoma","sans-serif";color:#444444"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Tahoma","sans-serif";color:#444444">BTW EJ, Which containers are you using and what is your interest in their use? For which applications are you using containers? I'm interested to learn more.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Tahoma","sans-serif";color:#444444"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Tahoma","sans-serif";color:#444444">Kind Regards, <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Tahoma","sans-serif";color:#444444"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Tahoma","sans-serif";color:#444444">Flanders<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">On Mon, Jan 11, 2016 at 2:02 PM, <<a href="mailto:Yuh-Jye.Chang@itri.org.tw" target="_blank">Yuh-Jye.Chang@itri.org.tw</a>> wrote:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">In my openstack deployment, I used containers for different openstack components. Since the kernel is shared, some of the global parameters needs to be adjusted, for example, the max open file descriptor. Or you will
soon find yourself running out of file descriptors in your containers. This kind of optimization may take time to shape. Also, other than those container advantages, there is no way to do live-migration at the current state of art.<br>
For the purpose of the Hackathon, I don’t think live migration is needed for most of the cloud application. They just need to have a lot of containers to scale out their cloud application. Also, for those simple application that does not use a lot of file
descriptors, they may not hit the issue of using up file descriptors like the mysql process or rabbitmq-server does. But, just in case, some of the cloud applications want to show how to optimized the energy usage of the compute node by moving the VMs around,
you could not do that with containers.<br>
<br>
Regards,<br>
EJ<br>
F Division, ICL, ITRI<br>
<br>
<br>
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