I would recommend you to keep all Vm configs on a separate location, so you
will be able to use virsh to start the VMs all by yourself (until you recover
yoour Hosted Engine in a hypothetical failiure).
Libvirt has ( in one of it's dirs ) all running VMs' configs - so just
back them up
Thank you for this answer and for your help.
After testing several operations without successfully change the IP
range, I decided to reinstall the host and the hosted engine. I was
afraid that I could not reinstall the engine correctly because I had
trouble installing it 3 days ago.
But this time
Hosts' ip can be safely changed only before deployment.
In your case , it would be better if you start from scratch and reinstall the
host with a new image, set the IP and then redeploy the HostedEngine (both
with correct VLANs).
What kind of data domain do you use. Maybe it will be easier to
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