I run bugzilla 2.21 on Debian Linux and I would like to take advantage of the enhancements and features in the latest release of bugzilla, at time of writing this is in 3.x numbering, currently 3.44.
I cannot simply upgrade to the new version, because: - I would like to give my users time to become familiar with the latest version - Avoids the risk of unavailability of the bugzilla service should there be complications with the upgrade - My bosses are quiet strict with this sort of thing; I can't be seen to just do an upgrade without some sort of trial, process or consultation. I would think that is reasonable.
What I would like to do is take a snapshot copy of the MySQL database content for the current bugzilla installed release, 2.21. Then use this copy with the latest release installed on the same machine.
The latest release would be entirely separate from the earlier 2.21 release. This means that there would be 2 bugzilla installations running on the same machine, each with its own data.
I would also like the latest version to be read-only. This is so that users continue to use version 2.21 for real work, but the latest version is for trialling, for becoming familiar with the different interface etc.
I would run this trial period for a few weeks, giving users prior notice of the eventual, inevitable upgrade. During the trial I would ask for feedback on the new release.
I have already searched for an answer to this question on the bugzilla mailing list (via Nabble) but no answers, so I posted the question myself a while ago (last March) but no reply. http://old.nabble.com/Multiple-bugzilla-release-version-installs-co-exist-in-parallel-on-one-server-%28e.g.-2.21-and-3.2%29-for-trialling-3.2-alongside-td22623349.html
The bugzilla documentation doesn't appear to advise on how to do this either.
What appears to complicate running parallel releases of bugzilla is that the installation (on Debian, at least) puts bugzilla programs and data in at least three places:
/etc/bugzilla /var/lib/bugzilla /usr/lib/cgi-bin/bugzilla
If the bugzilla install was all under one folder (e.g. like a Drupal install) then it would be simpler to run multiple versions in parallel.