We have a working installation using CentOS 6.7 and OpenNebula 4.14.2.
Since CentOS 6 in not supported in OpenNebula 5 we need to upgrade the OS (reinstall) on everything.
We have a two node front-end+node / node setup with a shared GFS2 filsystem and Open vSwitch setup.
How would you advice to proceed doing this with a minimum of downtime and hassle.
We have some extra hardware that could be setup a CentOS 7 / OpenNebula 5 front-end / host and act as the starting point of a new system that we also could connect to the current datastore (GFS2 shared filesystem).
And as we evacuate the CentOS 6 machines they can be reinstalled with CentOS 7 and OpenNebula 5 and join as hosts in the new system.
I guess there is no clever way of doing this live?
Am i missing some option that OpenNebula 5 offers us in this scenario?
Thank you for any advice,