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<p class="MsoNormal"><span style="color:#7030A0;mso-fareast-language:EN-US">Hi, <o:p>
</o:p></span></p>
<p class="MsoNormal"><span style="color:#7030A0;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#7030A0;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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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<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> Friday, June 29, 2018 4:25 AM<br>
<br>
<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="EN-US" style="color:red">In-lined comments / questions below,</span><span lang="EN-US" style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:red">Greg.</span><span lang="EN-US" style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman",serif;color:black"> </span><span lang="EN-US" style="color:black"><o:p></o:p></span></p>
<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)" <</span><span lang="EN-US"><a href="mailto:gergely.csatari@nokia.com"><span style="color:#954F72">gergely.csatari@nokia.com</span></a><span style="color:black">><br>
<b>Date: </b>Thursday, June 28, 2018 at 3:35 AM<br>
<br>
<o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Times New Roman",serif;color:black"> </span><span lang="EN-US" style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">Hi, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US" style="color:black">I’ve added the following pros and cons to the different options: <br>
<br>
<br>
<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="color:black;margin-bottom:12.0pt;mso-list:l4 level1 lfo1">
<span lang="EN-US">One Glance with multiple backends [<a href="https://wiki.openstack.org/wiki/Image_handling_in_edge_environment#One_Glance_with_multiple_backends"><span style="color:#954F72">1</span></a>] <br>
</span><span lang="EN-US" style="color:red">[Greg]<br>
I’m not sure I understand this option.<br>
<br>
Is each Glance Backend completely independent ? e.g. when I do a “glance image-create ...” am I specifying a backend and that’s where the image is to be stored ?<br>
This is what I was originally thinking.<br>
So I was thinking that synchronization of images to Edge Clouds is simply done by doing “glance image-create ...” to the appropriate backends.<br>
<br>
But then you say “The syncronisation of the image data is the responsibility of the backend (eg.: CEPH).” ... which makes it sound like my thinking above is wrong and the Backends are NOT completely independent, but instead in some sort of replication configuration
... is this leveraging ceph replication factor or something (for example) ?</span><span lang="EN-US"><o:p></o:p></span></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" style="color:#7030A0">[G0]: According to my understanding the backends are in a replication configuration in this case. Jokke, am I right?<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<ul style="margin-top:0cm" type="circle">
<li class="MsoNormal" style="color:black;mso-list:l4 level2 lfo1"><span lang="EN-US">Pros:
<o:p></o:p></span>
<ul style="margin-top:0cm" type="square">
<li class="MsoNormal" style="color:black;mso-list:l4 level3 lfo1"><span lang="EN-US">Relatively easy to implement based on the current Glance architecture<o:p></o:p></span></li></ul>
</li><li class="MsoNormal" style="color:black;mso-list:l4 level2 lfo1"><span lang="EN-US">Cons:
<o:p></o:p></span>
<ul style="margin-top:0cm" type="square">
<li class="MsoNormal" style="color:black;mso-list:l4 level3 lfo1"><span lang="EN-US">Requires the same Glance backend in every edge cloud instance<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-list:l4 level3 lfo1"><span lang="EN-US">Requires the same OpenStack version in every edge cloud instance (apart from during upgrade)<o:p></o:p></span></li><li class="MsoNormal" style="color:black;margin-bottom:12.0pt;mso-list:l4 level3 lfo1">
<span lang="EN-US">Sensitivity for network connection loss is not clear<br>
</span><span lang="EN-US" style="color:red">[Greg] I could be wrong, but even though the OpenStack services in the edge clouds are using the images in their glance backend with a direct URL, <br>
I think the OpenStack services (e.g. nova) still need to get the direct URL via the Glance API which is ONLY available at the central site.<br>
So don’t think this option supports autonomy of edge Subcloud when connectivity is lost to central site.</span><span lang="EN-US"><o:p></o:p></span></li></ul>
</li></ul>
</ul>
<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:106.2pt">
<span lang="EN-US" style="color:#7030A0">[G0]: Can’t the url point to the local Glance backend somehow?<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="color:black;mso-list:l4 level1 lfo1"><span lang="EN-US">Several Glances with an independent syncronisation service, sych via Glance API [<a href="https://wiki.openstack.org/wiki/Image_handling_in_edge_environment#Several_Glances_with_an_independent_syncronisation_service.2C_sych_via_Glance_API"><span style="color:#954F72">2</span></a>]
<o:p></o:p></span>
<ul style="margin-top:0cm" type="circle">
<li class="MsoNormal" style="color:black;mso-list:l4 level2 lfo1"><span lang="EN-US">Pros:
<o:p></o:p></span>
<ul style="margin-top:0cm" type="square">
<li class="MsoNormal" style="color:black;mso-list:l4 level3 lfo1"><span lang="EN-US">Every edge cloud instance can have a different Glance backend<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-list:l4 level3 lfo1"><span lang="EN-US">Can support multiple OpenStack versions in the different edge cloud instances<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-list:l4 level3 lfo1"><span lang="EN-US">Can be extended to support multiple VIM types<o:p></o:p></span></li></ul>
</li><li class="MsoNormal" style="color:black;mso-list:l4 level2 lfo1"><span lang="EN-US">Cons:
<o:p></o:p></span>
<ul style="margin-top:0cm" type="square">
<li class="MsoNormal" style="color:black;margin-bottom:12.0pt;mso-list:l4 level3 lfo1">
<span lang="EN-US">Needs a new synchronisation service<br>
</span><span lang="EN-US" style="color:red">[Greg] Don’t believe this is a big con ... suspect we are going to need this new synchronization service for synchronizing resources of a number of other openstack services ... not just glance.</span><span lang="EN-US"><o:p></o:p></span></li></ul>
</li></ul>
</li></ul>
<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:106.2pt">
<span lang="EN-US" style="color:#7030A0">[G0]: I agree, it is not a big con, but it is a con
</span><span lang="EN-US" style="font-family:"Segoe UI Emoji",sans-serif;color:#7030A0">😊</span><span lang="EN-US" style="color:#7030A0"> Should I add some note saying, that a synch service is most probably needed anyway?<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="color:black;mso-list:l4 level1 lfo1"><span lang="EN-US">Several Glances with an independent syncronisation service, synch using the backend [<a href="https://wiki.openstack.org/wiki/Image_handling_in_edge_environment#Several_Glances_with_an_independent_syncronisation_service.2C_synch_using_the_backend"><span style="color:#954F72">3</span></a>] <br>
</span><span lang="EN-US" style="color:red">[Greg] This option seems a little odd to me.<br>
We are synching the GLANCE DB via some new synchronization service, but synching the Images themselves via the backend ... I think that would be tricky to ensure consistency.</span><span lang="EN-US">
<o:p></o:p></span></li></ul>
<p class="MsoNormal" style="margin-left:35.4pt"><span lang="EN-US" style="color:#7030A0">[G0]: Yes, there is a place for errors here.
<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<ul style="margin-top:0cm" type="circle">
<li class="MsoNormal" style="color:black;mso-list:l4 level2 lfo1"><span lang="EN-US">Pros:
<o:p></o:p></span>
<ul style="margin-top:0cm" type="square">
<li class="MsoNormal" style="color:black;mso-list:l4 level3 lfo1"><span lang="EN-US">I could not find any<o:p></o:p></span></li></ul>
</li><li class="MsoNormal" style="color:black;mso-list:l4 level2 lfo1"><span lang="EN-US">Cons:
<o:p></o:p></span>
<ul style="margin-top:0cm" type="square">
<li class="MsoNormal" style="color:black;margin-bottom:12.0pt;mso-list:l4 level3 lfo1">
<span lang="EN-US">Needs a new synchronisation service<br>
<br>
<br>
<o:p></o:p></span></li></ul>
</li></ul>
<li class="MsoNormal" style="color:black;mso-list:l4 level1 lfo1"><span lang="EN-US">One Glance and multiple Glance API servers [<a href="https://wiki.openstack.org/wiki/Image_handling_in_edge_environment#One_Glance_and_multiple_Glance_API_servers"><span style="color:#954F72">4</span></a>]
<o:p></o:p></span>
<ul style="margin-top:0cm" type="circle">
<li class="MsoNormal" style="color:black;mso-list:l4 level2 lfo1"><span lang="EN-US">Pros:
<o:p></o:p></span>
<ul style="margin-top:0cm" type="square">
<li class="MsoNormal" style="color:black;mso-list:l4 level3 lfo1"><span lang="EN-US">Implicitly location aware<o:p></o:p></span></li></ul>
</li><li class="MsoNormal" style="color:black;mso-list:l4 level2 lfo1"><span lang="EN-US">Cons:
<o:p></o:p></span>
<ul style="margin-top:0cm" type="square">
<li class="MsoNormal" style="color:black;mso-list:l4 level3 lfo1"><span lang="EN-US">First usage of an image always takes a long time<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-list:l4 level3 lfo1"><span lang="EN-US">In case of network connection error to the central Galnce Nova will have access to the images, but will not be able to figure out if the user have rights to use the image and
will not have path to the images data<br>
</span><span lang="EN-US" style="color:red">[Greg] Yeah we tripped over the issue that although the Glance API can cache the image itself, it does NOT cache the image meta data (which I am guessing has info like “user access” etc.) ... so this option improves
latency of access to image itself but does NOT provide autonomy.<br>
<br>
We plan on looking at options to resolve this, as we like the “implicit location awareness” of this option ... and believe it is an option that some customers will like.<br>
If anyone has any ideas ?</span><span lang="EN-US"><o:p></o:p></span></li></ul>
</li></ul>
</li></ul>
<p class="MsoNormal"><span lang="EN-US" style="color:black">Are these correct? Do I miss anything?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#7030A0"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#7030A0">Thanks, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#7030A0">Gerg0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">[1]: </span><span lang="EN-US"><a href="https://wiki.openstack.org/wiki/Image_handling_in_edge_environment#One_Glance_with_multiple_backends"><span style="color:#954F72">https://wiki.openstack.org/wiki/Image_handling_in_edge_environment#One_Glance_with_multiple_backends</span></a><span style="color:black"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">[2]: </span><span lang="EN-US"><a href="https://wiki.openstack.org/wiki/Image_handling_in_edge_environment#Several_Glances_with_an_independent_syncronisation_service.2C_sych_via_Glance_API"><span style="color:#954F72">https://wiki.openstack.org/wiki/Image_handling_in_edge_environment#Several_Glances_with_an_independent_syncronisation_service.2C_sych_via_Glance_API</span></a><span style="color:black"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">[3]: </span><span lang="EN-US"><a href="https://wiki.openstack.org/wiki/Image_handling_in_edge_environment#Several_Glances_with_an_independent_syncronisation_service.2C_synch_using_the_backend"><span style="color:#954F72">https://wiki.openstack.org/wiki/Image_handling_in_edge_environment#Several_Glances_with_an_independent_syncronisation_service.2C_synch_using_the_backend</span></a><span style="color:black"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black">[4]: </span><span lang="EN-US"><a href="https://wiki.openstack.org/wiki/Image_handling_in_edge_environment#One_Glance_and_multiple_Glance_API_servers"><span style="color:#954F72">https://wiki.openstack.org/wiki/Image_handling_in_edge_environment#One_Glance_and_multiple_Glance_API_servers</span></a><span style="color:black"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman",serif;color:black"> </span><span lang="EN-US" style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman",serif"><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>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Csatari, Gergely (Nokia - HU/Budapest)
<br>
<b>Sent:</b> Monday, June 11, 2018 4:29 PM<br>
<b>To:</b> Waines, Greg <<a href="mailto:Greg.Waines@windriver.com">Greg.Waines@windriver.com</a>>; 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> RE: [Edge-computing] [edge][glance][mixmatch]: Wiki of the possible architectures for image synchronisation<o:p></o:p></span></p>
</div>
</div>
<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">Thanks for the comments. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I’ve updated the wiki: <a href="https://wiki.openstack.org/wiki/Image_handling_in_edge_environment#Several_Glances_with_an_independent_syncronisation_service.2C_synch_using_the_backend">
https://wiki.openstack.org/wiki/Image_handling_in_edge_environment#Several_Glances_with_an_independent_syncronisation_service.2C_synch_using_the_backend</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>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Waines, Greg [<a href="mailto:Greg.Waines@windriver.com">mailto:Greg.Waines@windriver.com</a>]
<br>
<b>Sent:</b> Friday, June 8, 2018 1:46 PM<br>
<b>To:</b> Csatari, Gergely (Nokia - HU/Budapest) <<a href="mailto:gergely.csatari@nokia.com">gergely.csatari@nokia.com</a>>; 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> Re: [Edge-computing] [edge][glance][mixmatch]: Wiki of the possible architectures for image synchronisation<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:red">Responses in-lined below,</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:red">Greg.</span><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>Friday, June 8, 2018 at 3:39 AM<br>
<b>To: </b>Greg Waines <<a href="mailto:Greg.Waines@windriver.com">Greg.Waines@windriver.com</a>>, "<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"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Times New Roman",serif"> </span><span lang="EN-US"><o:p></o:p></span></p>
</div>
<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">Going inline.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Waines, Greg [<a href="mailto:Greg.Waines@windriver.com">mailto:Greg.Waines@windriver.com</a>]
<br>
<b>Sent:</b> Thursday, June 7, 2018 2:24 PM<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</span></u></b><span lang="EN-US"><o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="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="MsoNormal" style="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="MsoNormal" style="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)</span></u></b><span lang="EN-US"><o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="mso-list:l3 level1 lfo3"><span lang="EN-US">I refer to this as the PUSH model<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l3 level1 lfo3"><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="MsoNormal" style="margin-bottom:12.0pt;mso-list:l3 level2 lfo3"><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?<br>
<span style="color:red">[Greg] Yeah we should keep it as an alternative.</span><o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="mso-list:l3 level1 lfo3"><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="MsoNormal" style="margin-bottom:12.0pt;mso-list:l3 level2 lfo3"><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.<br>
<span style="color:red">[Greg] Agreed ... we’ve had some very high-level discussions with end users, but haven’t put together a proposal yet.</span><o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="mso-list:l3 level1 lfo3"><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)</span></u></b><span lang="EN-US"><o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="mso-list:l1 level1 lfo4"><span lang="EN-US">I refer to this as the PULL model<o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l1 level1 lfo4"><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="MsoNormal" style="mso-list:l1 level2 lfo4"><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="MsoNormal" style="mso-list:l1 level2 lfo4"><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.<br>
<span style="color:red">[Greg] We enabled image caching in the Glance API.<br>
I believe that Nova Image Caching caches at the compute node ... this would work ok for all-in-one edge clouds or small edge clouds.<br>
But glance-api caching caches at the edge cloud level, so works better for large edge clouds with lots of compute nodes.</span><o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="mso-list:l1 level1 lfo4"><span lang="EN-US"> <o:p></o:p></span></li><li class="MsoNormal" style="mso-list:l1 level1 lfo4"><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" style="color:red">[Greg] The PULL model certainly results in the most efficient distribution of images ... basically images are distributed ONLY to edge clouds that explicitly use the image.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:red">Also if the use case is NOT concerned about incurring the latency of the image transfer from Central to Edge on the FIRST use of image then the PULL model could be preferred ... TBD.</span><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">Here is the updated wiki: <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" style="color:red">[Greg] Looks good.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:red"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:red">Greg.</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:red"> </span><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">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>
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<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"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Times New Roman",serif"> </span><span lang="EN-US"><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 lfo5"><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 lfo5"><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 lfo5"><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 lfo5"><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 lfo5"><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>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="margin-left:-12.75pt;mso-list:l0 level1 lfo5"><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)
<br>
<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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