<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Hello,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We currently plan to upgrade our Openstack setup from Icehouse to Juno or even Kilo. This also includes a version upgrade on the host based OS from Centos 6.6 to 7.x<o:p></o:p></p><p class=MsoNormal>I have some questions regarding the upgrade an hope to learn from your experience.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>First question is, is there a Openstack version compatibility guaranteed within the different releases? The idea behind it to upgrade the different services (compute nodes / management nodes) in separate phases.<o:p></o:p></p><p class=MsoNormal>Second, is the live-migration with block-migrate feature compatible between versions. One upgrade solution we currently playing with is to move existing VMs with live-migration & block-migrate (no shared storage) to fresh installed Centos 7 Kilo compute nodes.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Any best practice tips highly appreciated!<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Cheers,<o:p></o:p></p><p class=MsoNormal>Chris<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>