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<div class="WordSection1">
<p class="MsoNormal">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></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><u>One Glance with multiple backends<o:p></o:p></u></b></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l2 level1 lfo6"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>In this scenario, are all Edge Clouds simply configured with the one central glance for its GLANCE ENDPOINT ?<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l2 level2 lfo6">
<![if !supportLists]><span style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>i.e. GLANCE is a typical shared service in a multi-region environment ?<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l2 level1 lfo6"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>If so,<br>
how does this OPTION support the requirement for Edge Cloud Operation when disconnected from Central Location ?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><u>Several Glances with an independent synchronization service (PUSH)<o:p></o:p></u></b></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l3 level1 lfo7"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>I refer to this as the PUSH model<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l3 level1 lfo7"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>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></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l3 level2 lfo7">
<![if !supportLists]><span style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>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)<br>
<br>
<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l3 level1 lfo7"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>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></p>
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<![if !supportLists]><span style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>i.e. you don’t want Central Site pushing ALL images to ALL Edge Sites ... especially for the small Edge Sites<br>
<br>
<o:p></o:p></p>
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</span></span></span><![endif]>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></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><u>One Glance and multiple Glance API Servers (PULL)<o:p></o:p></u></b></p>
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</span></span></span><![endif]>I refer to this as the PULL model<o:p></o:p></p>
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</span></span></span><![endif]>This is the current model supported in StarlingX’s Distributed Cloud sub-project<o:p></o:p></p>
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<![if !supportLists]><span style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>We run glance-api on all Edge Clouds ... that talk to glance-registry on the Central Cloud, and<o:p></o:p></p>
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<![if !supportLists]><span style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>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></p>
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</span></span></span><![endif]> <o:p></o:p></p>
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</span></span></span><![endif]>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></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In StarlingX Distributed Cloud, <o:p></o:p></p>
<p class="MsoNormal">We plan on supporting both the PUSH and PULL model ... suspect there are use cases for both.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Greg.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="color:black">From: </span></b><span style="color:black">"Csatari, Gergely (Nokia - HU/Budapest)" <gergely.csatari@nokia.com><br>
<b>Date: </b>Thursday, June 7, 2018 at 6:49 AM<br>
<b>To: </b>"openstack-dev@lists.openstack.org" <openstack-dev@lists.openstack.org>, "edge-computing@lists.openstack.org" <edge-computing@lists.openstack.org><br>
<b>Subject: </b>Re: [Edge-computing] [edge][glance][mixmatch]: Wiki of the possible architectures for image synchronisation</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Times New Roman""><o:p> </o:p></span></p>
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<p class="MsoNormal">Hi, <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I did some work ont he figures and realised, that I have some questions related to the alternative options:<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Multiple backends option: <o:p></o:p></p>
<p class="MsoNormal" style="margin-left:23.25pt;text-indent:-.25in;mso-list:l0 level1 lfo3">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>What is the API between Glance and the Glance backends?<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>How is it possible to implement location aware synchronisation (synchronise images only to those cloud instances where they are needed)?<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Is it possible to have different OpenStack versions in the different cloud instances?<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Can a cloud instance use the locally synchronised images in case of a network connection break?<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Is it possible to implement this without storing database credentials ont he edge cloud instances?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Independent synchronisation service: <o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>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></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">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></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">[1]: <a href="https://mixmatch.readthedocs.io/en/latest/">https://mixmatch.readthedocs.io/en/latest/</a><o:p></o:p></p>
<p class="MsoNormal">[2]: <a href="https://doodle.com/poll/bddg65vyh4qwxpk5">https://doodle.com/poll/bddg65vyh4qwxpk5</a><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Br, <o:p></o:p></p>
<p class="MsoNormal">Gerg0<o:p></o:p></p>
<p class="MsoNormal"><a name="_MailEndCompose"> <o:p></o:p></a></p>
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<p class="MsoNormal"><b><span style="mso-fareast-language:HU">From:</span></b><span style="mso-fareast-language:HU"> Csatari, Gergely (Nokia - HU/Budapest)
<br>
<b>Sent:</b> Wednesday, May 23, 2018 8:59 PM<br>
<b>To:</b> OpenStack Development Mailing List (not for usage questions) <openstack-dev@lists.openstack.org>; edge-computing@lists.openstack.org<br>
<b>Subject:</b> [edge][glance]: Wiki of the possible architectures for image synchronisation</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Hi, <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">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></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Please check and correct/comment. <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">Gerg0<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">[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></p>
<p class="MsoNormal">[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></p>
<p class="MsoNormal">[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></p>
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