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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Going inline.<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></a></p>
<span style="mso-bookmark:_MailEndCompose"></span>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Waines, Greg [mailto:Greg.Waines@windriver.com]
<br>
<b>Sent:</b> Thursday, June 7, 2018 2:24 PM<br>
<br>
<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="EN-US">I had some additional questions/comments on the Image Synchronization Options (
<a href="https://wiki.openstack.org/wiki/Image_handling_in_edge_environment">https://wiki.openstack.org/wiki/Image_handling_in_edge_environment</a> ):<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><u><span lang="EN-US">One Glance with multiple backends<o:p></o:p></span></u></b></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level1 lfo2"><span lang="EN-US">In this scenario, are all Edge Clouds simply configured with the one central glance for its GLANCE ENDPOINT ?<o:p></o:p></span>
<ul style="margin-top:0cm" type="circle">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level2 lfo2"><span lang="EN-US">i.e. GLANCE is a typical shared service in a multi-region environment ?<o:p></o:p></span></li></ul>
</li></ul>
<p class="MsoNormal" style="margin-left:18.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:18.0pt"><span lang="EN-US">[G0]: In my understanding yes.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l2 level1 lfo2"><span lang="EN-US">If so,<br>
how does this OPTION support the requirement for Edge Cloud Operation when disconnected from Central Location ?<o:p></o:p></span></li></ul>
<p class="MsoNormal" style="margin-left:18.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:18.0pt"><span lang="EN-US">[G0]: This is an open question for me also.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><u><span lang="EN-US">Several Glances with an independent synchronization service (PUSH)<o:p></o:p></span></u></b></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l3 level1 lfo4"><span lang="EN-US">I refer to this as the PUSH model<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l3 level1 lfo4"><span lang="EN-US">I don’t believe you have to ( or necessarily should) rely on the backend to do the synchronization of the images<o:p></o:p></span>
<ul style="margin-top:0cm" type="circle">
<li class="MsoListParagraph" style="margin-bottom:12.0pt;margin-left:0cm;mso-list:l3 level2 lfo4">
<span lang="EN-US">i.e. the ‘Synch Service’ could do this strictly through Glance REST APIs
<br>
(making it independent of the particular Glance backend ... and allowing the Glance Backends at Central and Edge sites to actually be different)<o:p></o:p></span></li></ul>
</li></ul>
<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:36.0pt">
<span lang="EN-US">[G0]: Okay, I can update the wiki to reflect this. Should we keep the “synchronization by the backend” option as an other alternative?<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l3 level1 lfo4"><span lang="EN-US">I think the ‘Synch Service’ MUST be able to support ‘selective/multicast’ distribution of Images from Central to Edge for Image Synchronization<o:p></o:p></span>
<ul style="margin-top:0cm" type="circle">
<li class="MsoListParagraph" style="margin-bottom:12.0pt;margin-left:0cm;mso-list:l3 level2 lfo4">
<span lang="EN-US">i.e. you don’t want Central Site pushing ALL images to ALL Edge Sites ... especially for the small Edge Sites<o:p></o:p></span></li></ul>
</li></ul>
<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:35.4pt">
<span lang="EN-US">[G0]: Yes, the question is how to define these synchronization policies.<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l3 level1 lfo4"><span lang="EN-US">Not sure ... but I didn’t think this was the model being used in mixmatch ... thought mixmatch was more the PULL model (below)<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US">[G0]: Yes, this is more or less my understanding. I remove the mixmatch reference from this chapter.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><u><span lang="EN-US">One Glance and multiple Glance API Servers (PULL)<o:p></o:p></span></u></b></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo6"><span lang="EN-US">I refer to this as the PULL model<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo6"><span lang="EN-US">This is the current model supported in StarlingX’s Distributed Cloud sub-project<o:p></o:p></span>
<ul style="margin-top:0cm" type="circle">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level2 lfo6"><span lang="EN-US">We run glance-api on all Edge Clouds ... that talk to glance-registry on the Central Cloud, and<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level2 lfo6"><span lang="EN-US">We have glance-api setup for caching such that only the first access to an particular image incurs the latency of the image transfer from Central to Edge<o:p></o:p></span></li></ul>
</li></ul>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US">[G0]: Do you do image caching in Glance API or do you rely in the image cache in Nova? In the Forum session there were some discussions about this and I think the conclusion was that using the
image cache of Nova is enough.<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo6"><span lang="EN-US"> <o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo6"><span lang="EN-US">this PULL model affectively implements the location aware synchronization you talk about below, (i.e. synchronise images only to those cloud instances where they
are needed)?<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">In StarlingX Distributed Cloud, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We plan on supporting both the PUSH and PULL model ... suspect there are use cases for both.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">[G0]: This means that you need an architecture supporting both.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Just for my curiosity what is the use case for the pull model once you have the push model in place?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Here is the updated wiki: https://wiki.openstack.org/wiki/Image_handling_in_edge_environment<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Gerg0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US" style="color:black">From: </span></b><span lang="EN-US" style="color:black">"Csatari, Gergely (Nokia - HU/Budapest)" <<a href="mailto:gergely.csatari@nokia.com">gergely.csatari@nokia.com</a>><br>
<b>Date: </b>Thursday, June 7, 2018 at 6:49 AM<br>
<b>To: </b>"<a href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>" <<a href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>>, "<a href="mailto:edge-computing@lists.openstack.org">edge-computing@lists.openstack.org</a>"
<<a href="mailto:edge-computing@lists.openstack.org">edge-computing@lists.openstack.org</a>><br>
<b>Subject: </b>Re: [Edge-computing] [edge][glance][mixmatch]: Wiki of the possible architectures for image synchronisation</span><span lang="EN-US" style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Hi, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I did some work ont he figures and realised, that I have some questions related to the alternative options:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Multiple backends option: <o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="margin-left:-12.75pt;mso-list:l0 level1 lfo8"><span lang="EN-US">What is the API between Glance and the Glance backends?<o:p></o:p></span></li><li class="MsoNormal" style="margin-left:-12.75pt;mso-list:l0 level1 lfo8"><span lang="EN-US">How is it possible to implement location aware synchronisation (synchronise images only to those cloud instances where they are needed)?<o:p></o:p></span></li><li class="MsoNormal" style="margin-left:-12.75pt;mso-list:l0 level1 lfo8"><span lang="EN-US">Is it possible to have different OpenStack versions in the different cloud instances?<o:p></o:p></span></li><li class="MsoNormal" style="margin-left:-12.75pt;mso-list:l0 level1 lfo8"><span lang="EN-US">Can a cloud instance use the locally synchronised images in case of a network connection break?<o:p></o:p></span></li><li class="MsoNormal" style="margin-left:-12.75pt;mso-list:l0 level1 lfo8"><span lang="EN-US">Is it possible to implement this without storing database credentials ont he edge cloud instances?<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Independent synchronisation service: <o:p>
</o:p></span></p>
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<li class="MsoNormal" style="margin-left:-12.75pt;mso-list:l0 level1 lfo8"><span lang="EN-US">If I understood [<a href="https://mixmatch.readthedocs.io/en/latest/">1</a>] correctly mixmatch can help Nova to attach a remote volume, but it will not help in synchronizing
the images. is this true?<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">As I promised in the Edge Compute Group call I plan to organize an IRC review meeting to check the wiki. Please indicate your availability in [<a href="https://doodle.com/poll/bddg65vyh4qwxpk5">2</a>].<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">[1]: <a href="https://mixmatch.readthedocs.io/en/latest/">
https://mixmatch.readthedocs.io/en/latest/</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">[2]: <a href="https://doodle.com/poll/bddg65vyh4qwxpk5">
https://doodle.com/poll/bddg65vyh4qwxpk5</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Br, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Gerg0<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"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Csatari, Gergely (Nokia - HU/Budapest)
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<b>Sent:</b> Wednesday, May 23, 2018 8:59 PM<br>
<b>To:</b> OpenStack Development Mailing List (not for usage questions) <<a href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>>;
<a href="mailto:edge-computing@lists.openstack.org">edge-computing@lists.openstack.org</a><br>
<b>Subject:</b> [edge][glance]: Wiki of the possible architectures for image synchronisation<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Hi, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Here I send the wiki page [<a href="https://wiki.openstack.org/wiki/Image_handling_in_edge_environment">1</a>] where I summarize what I understood from the Forum session about image synchronisation in edge environment
[2], [3].<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Please check and correct/comment. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Gerg0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">[1]: <a href="https://wiki.openstack.org/wiki/Image_handling_in_edge_environment">
https://wiki.openstack.org/wiki/Image_handling_in_edge_environment</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">[2]: <a href="https://etherpad.openstack.org/p/yvr-edge-cloud-images">
https://etherpad.openstack.org/p/yvr-edge-cloud-images</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">[3]: <span class="author-a-z75z2oz122zz71zz87zz67zz89zz69zz82zw1z122zz65zz82zh">
<a href="https://www.openstack.org/summit/vancouver-2018/summit-schedule/events/21768/image-handling-in-an-edge-cloud-infrastructure">https://www.openstack.org/summit/vancouver-2018/summit-schedule/events/21768/image-handling-in-an-edge-cloud-infrastructure</a></span><o:p></o:p></span></p>
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