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</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple style='tab-interval:35.4pt'><div class=WordSection1><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Hi all,<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;mso-ansi-language:EN-US'>Today <span style='mso-spacerun:yes'> </span>I am searching for a solution to distribute <span class=SpellE>OpenStack</span> over several geographies/<span class=SpellE>availabilitiy</span> zones and we found one from <span class=SpellE>Huawei</span> in [1]. In short, it’s a classical centralized solution like Eucalyptus cloud [2], whereby there is a central control for all clusters in a top down topology. The central control actively collects available resource from each cluster and also proxy the request from one cluster to the other one.<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;mso-ansi-language:EN-US'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;mso-ansi-language:EN-US'>From my point of view this is where <span class=SpellE>OpenStack</span> comes to play and be different from Eucalyptus when <span class=SpellE>OpenStack</span> goes to the direction of a decentralized and distributed system. This is why I have some doubts about the solution from <span class=SpellE>Huawei.</span><o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;mso-ansi-language:EN-US'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;mso-ansi-language:EN-US'>My question is if we have anything for distributed <span class=SpellE>OpenStack</span> over geography before? A decentralized <span class=SpellE>OpenStack</span> Cluster can be thought as follows:<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;mso-ansi-language:EN-US'><br>Each cluster has their own control node (nova-scheduler, neutron-server..), and has its own data base to work independently whereby:<br style='mso-special-character:line-break'><![if !supportLineBreakNewLine]><br style='mso-special-character:line-break'><![endif]><o:p></o:p></span></font></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;mso-bidi-font-family:Calibri;mso-ansi-language:EN-US'><span style='mso-list:Ignore'>1.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><span lang=EN-US style='mso-ansi-language:EN-US'>Each cluster stores available resources of its local cluster only (for DB <span class=SpellE>Sharding</span>). This data does not need to be shared between clusters. And the API from one cluster can ask for healthy states from another one when needed.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;mso-bidi-font-family:Calibri;mso-ansi-language:EN-US'><span style='mso-list:Ignore'>2.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><span lang=EN-US style='mso-ansi-language:EN-US'>All information about one tenant across multiple clusters, <span class=SpellE>i.e</span> tenant network, VMs info and meta data, should be shared the same and eventually consistent across clusters. For example: neutron-server creates a tenant network in its cluster, this tenant network information will be published to all other clusters data base for L2 population.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;mso-bidi-font-family:Calibri;mso-ansi-language:EN-US'><span style='mso-list:Ignore'>3.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><span lang=EN-US style='mso-ansi-language:EN-US'>Any <span class=SpellE>NoSQL</span> DB out there can help for DB <span class=SpellE>Sharding</span> and Eventually Consistency.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;mso-bidi-font-family:Calibri;mso-ansi-language:EN-US'><span style='mso-list:Ignore'>4.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><span lang=EN-US style='mso-ansi-language:EN-US'>Each cluster can have its own keystone server (Trust Provider). Each Trust Provider issues its trust, which also be trusted by the other provider if both providers trust each other certificates, similar to Web services SSO like SAML.<o:p></o:p></span></p><p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;mso-ansi-language:EN-US'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;mso-ansi-language:EN-US'>Hope to get some feedbacks from you.<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;mso-ansi-language:EN-US'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;mso-ansi-language:EN-US'>[1] </span><a href="https://wiki.openstack.org/wiki/OpenStack_cascading_solution"><span lang=EN-US style='mso-ansi-language:EN-US'>https://wiki.openstack.o</span><span class=SpellE>rg</span>/<span class=SpellE>wiki</span>/<span class=SpellE>OpenStack_cascading_solution</span></a><o:p></o:p></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>[2] <a href="https://www.eucalyptus.com/eucalyptus-cloud/iaas">https://www.eucalyptus.com/eucalyptus-cloud/iaas</a><o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal style='mso-pagination:none;mso-layout-grid-align:none;text-autospace:none'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";mso-fareast-language:DE;mso-no-proof:yes'>Kind Regards,<o:p></o:p></span></font></p><p class=MsoNormal style='mso-pagination:none;mso-layout-grid-align:none;text-autospace:none'><font size=2 face=Arial><span style='font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";mso-fareast-language:DE;mso-no-proof:yes'>Tri Hoang Vo<o:p></o:p></span></font></p><p class=MsoNormal><font size=1 face=Arial><span style='font-size:7.5pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";mso-fareast-language:DE;mso-no-proof:yes'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=1 face=Arial><span style='font-size:9.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";mso-fareast-language:DE;mso-no-proof:yes'><o:p> </o:p></span></font></p><p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><b style='mso-bidi-font-weight:normal'><font size=1 color=black face=Arial><span style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:black;text-transform:uppercase;mso-fareast-language:DE;font-weight:bold;mso-bidi-font-weight:normal;mso-no-proof:yes'>Deutsche Telekom AG<o:p></o:p></span></font></b></p><p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font size=1 color=black face=Arial><span lang=EN-US style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:black;mso-ansi-language:EN-US;mso-fareast-language:DE;mso-no-proof:yes'>Product & Innovations<o:p></o:p></span></font></p><p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font size=1 color=black face=Arial><span lang=EN-US style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:black;mso-ansi-language:EN-US;mso-fareast-language:DE;mso-no-proof:yes'>Tri Hoang Vo<o:p></o:p></span></font></p><p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font size=1 color=black face=Arial><span lang=EN-US style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:black;mso-ansi-language:EN-US;mso-fareast-language:DE;mso-no-proof:yes'>Software Developer<o:p></o:p></span></font></p><p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font size=1 color=black face=Arial><span lang=EN-US style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:black;mso-ansi-language:EN-US;mso-fareast-language:DE;mso-no-proof:yes'>Dernburgstrasse 50, 14057 Berlin, Germany<o:p></o:p></span></font></p><p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font size=1 color=black face=Arial><span lang=EN-US style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:black;mso-ansi-language:EN-US;mso-fareast-language:DE;mso-no-proof:yes'>+49 151 649-22645 (Mobile)<o:p></o:p></span></font></p><p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font size=1 color=black face=Arial><span lang=EN-US style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:black;mso-ansi-language:EN-US;mso-fareast-language:DE;mso-no-proof:yes'>E-Mail: <a href="mailto:maik.muster@telekom.de"><font color=black><span style='mso-bidi-font-size:11.0pt;color:black;text-decoration:none;text-underline:none'>t.vo_hoang@telekom.de</span></font></a><o:p></o:p></span></font></p><p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font size=1 color=black face=Arial><span lang=EN-GB style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:black;mso-ansi-language:EN-GB;mso-fareast-language:DE;mso-no-proof:yes'><a href="http://www.telekom.com/"><font color=black><span style='mso-bidi-font-size:11.0pt;color:black;text-decoration:none;text-underline:none'>www.telekom.com</span></font></a><span style='mso-spacerun:yes'> </span><o:p></o:p></span></font></p><p class=MsoNormal><font size=1 color="#e20074" face=Arial><span lang=EN-US style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:#E20074;mso-ansi-language:EN-US;mso-fareast-language:DE;mso-no-proof:yes'><o:p> </o:p></span></font></p><p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><b style='mso-bidi-font-weight:normal'><font size=2 color="#e20074" face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:#E20074;text-transform:uppercase;mso-ansi-language:EN-GB;mso-fareast-language:DE;font-weight:bold;mso-bidi-font-weight:normal;mso-no-proof:yes'>Life is for sharing.</span></font></b><b style='mso-bidi-font-weight:normal'><font size=2 color=black face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:black;text-transform:uppercase;mso-ansi-language:EN-GB;mso-fareast-language:DE;font-weight:bold;mso-bidi-font-weight:normal;mso-no-proof:yes'><span style='mso-spacerun:yes'> </span><o:p></o:p></span></font></b></p><p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font size=1 color=black face=Arial><span lang=EN-GB style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:black;mso-ansi-language:EN-GB;mso-fareast-language:DE;mso-no-proof:yes'><o:p> </o:p></span></font></p><p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><b style='mso-bidi-font-weight:normal'><font size=1 color=black face=Arial><span style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:black;text-transform:uppercase;mso-fareast-language:DE;font-weight:bold;mso-bidi-font-weight:normal;mso-no-proof:yes'>Deutsche Telekom AG<o:p></o:p></span></font></b></p><p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font size=1 color=black face=Arial><span style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:black;mso-fareast-language:DE;mso-no-proof:yes'>Supervisory Board: Prof. Dr. Ulrich Lehner (Chairman)<o:p></o:p></span></font></p><p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font size=1 color=black face=Arial><span lang=EN-US style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:black;mso-ansi-language:EN-US;mso-fareast-language:DE;mso-no-proof:yes'>Board of Management: Timotheus Höttges (Chairman),<br>Reinhard Clemens, Niek Jan van Damme,<br>Thomas Dannenfeldt, Dr. Thomas Kremer, Claudia Nemat,<o:p></o:p></span></font></p><p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font size=1 color=black face=Arial><span style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:black;mso-fareast-language:DE;mso-no-proof:yes'>Commercial register: Amtsgericht Bonn HRB 6794<o:p></o:p></span></font></p><p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font size=1 color=black face=Arial><span lang=EN-GB style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:black;mso-ansi-language:EN-GB;mso-fareast-language:DE;mso-no-proof:yes'>Registered office: Bonn<o:p></o:p></span></font></p><p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><font size=1 color=black face=Arial><span lang=EN-GB style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:black;mso-ansi-language:EN-GB;mso-fareast-language:DE;mso-no-proof:yes'><o:p> </o:p></span></font></p><p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><b style='mso-bidi-font-weight:normal'><font size=1 color=black face=Arial><span lang=EN-GB style='font-size:8.0pt;font-family:"Arial","sans-serif";mso-fareast-font-family:"Times New Roman";color:black;text-transform:uppercase;mso-ansi-language:EN-GB;mso-fareast-language:DE;font-weight:bold;mso-bidi-font-weight:normal;mso-no-proof:yes'>conserve resources by not printing every e-mail.<o:p></o:p></span></font></b></p><p class=MsoNormal><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;mso-ansi-language:EN-US'><o:p> </o:p></span></font></p></div></body></html>