I know of no one who has done an inplace upgrade. You are better off setting up 
a new server and copying the containers from the old system to the new system.

Since there are changes in ploop you can do vzmigrate, or something like 
manually create the ploop systems on the new server and manually migrate them.

I have done in place upgrades from centos3->4, 4->5 and 5->6. Never tried 6->7 
with changes like systemctl and extensive kernel changes (v2->3 all the others 
were in in 2.x) you are looking at a difficult change when a copy is so much 
easier. Even with that, there were occassional issues with in place upgrades 
that would come up from time to time, and need good knowledge of the systems to 
fix them.
________________________________
From: users-boun...@openvz.org <users-boun...@openvz.org> on behalf of Conseev 
Hosting <host...@conseev.com>
Sent: Sunday, June 30, 2019 9:44:29 AM
To: users@openvz.org
Subject: [Users] Switching to vzkernel-3.10.0-957.10.1.vz7.85.17.x86_64.rpm

Hello,

We currently have OpenVZ nodes running 2.6.32-042stab124.2 and would like to be 
able to have the newer OpenVZ kernel. On these existing nodes is there no issue 
with installing this RPM from 
https://download.openvz.org/virtuozzo/releases/openvz-7.0.10-252/x86_64/os/Packages/v/
 and rebooting into it or are there other steps that have to be taken to 
prepare for the change?
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