Data migration from one server to another server

[jkjha]

I’m running OpenGrok in Docker, with both the source tree and index data stored on a VM volume that’s mounted into the container. I need to upgrade the host OS from CentOS 7 to CentOS 9. If I rsync the full OpenGrok dataset, /opengrok/src, /opengrok/data/{index,historycache}, and /opengrok/xref, to the new server and mount it (switch from existing old indexer vm) as the indexer volume, will that work reliably, or are there data-integrity risks? What’s the recommended approach to avoid a full reindex? The dataset is ~7 TB (sources, indexes, xref), so rebuilding from scratch would be very time- and resource-intensive.

[jkjha]

We are running upgraded version of opengrok v1.14.2