Infrastructure

Florian Effenberger wrote:

• plan the migration, also wrt. timing (when's a good time to do the switch? IIRC for 2015, it was early January?)

The FDO -> TDF migration was on January 24th, which was a Saturday. Migrating late on a Friday or early on a Saturday in January sounds reasonable.

• test the migration with productive data on the test VM

We'll use the branch tdf-draft-5.0 for the test VM. We're also verifying patches against 4.4.10 for the Whiteboard/triaging, so we'll need to determine if we can switch back and forth between those versions safely, or if deploying 5.0 will cause any incompatible database upgrades.

Because we use the test VM for staging before production and upgrading is a 1-way street, the db is being duplicated so that we have a 4.10-db and a 5.0-db and then can switch between them as needed. This is a bit more complicated than our current test mechanism, but it's the simplest way for us to use the same VM for both types of testing.

Once we upgrade production to Bugzilla 5 (January-ish), we can then drop the older test-db for Bugzilla 4.10. I think space-wise we should have no problems on the test VM for now.