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<p class="MsoNormal">Hi Angie,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The feature looks great that we can now upgrade the k8s cluster at runtime. Regarding the details, I and other folks have several questions that we didn’t find clues in the doc. Could you please give us the info from designer’s view?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo3">Why the upgrade complete cmd line needed? Any essential checks?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo3">If the first master node upgrade completed on the active controller, that means the active control plane is upgraded to the new version. Then how to ensure the compatibility between
 upgraded controller plane and un-upgraded kubelet before step 12?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo3">What will happen if some nodes restart unexpectedly between step 11 and 12?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo3">How to deal with the certificates and keys of Kubernetes during upgrading?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo3">Is upgrade rollback supported regardless the upgrade completion?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo3">Is kubelet/kubectl patch marked as in-service patch or reboot-required patch?<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l2 level1 lfo3">Why lock/unlock is needed to upgrade kubelet? Is there a way to avoid that? Since this will impact the running pods on all nodes.<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal">Mingyuan<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Wang, Jing (Angie) <Angie.Wang@windriver.com> <br>
<b>Sent:</b> Thursday, February 27, 2020 23:17<br>
<b>To:</b> starlingx-discuss@lists.starlingx.io<br>
<b>Cc:</b> Dale, Kristal <kristal.dale@intel.com><br>
<b>Subject:</b> [Starlingx-discuss] [docs]Provide doc input for 2006781<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi All,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The attached file is the documentation changes required for the story “Kubernetes upgrade support in StarlingX” (<a href="https://storyboard.openstack.org/#!/story/2006781">https://storyboard.openstack.org/#!/story/2006781</a>).
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Angie<o:p></o:p></p>
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