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Chapter 1. Red Hat Quay v2.y.z to v3.0.z upgrade
For the v2.y.z to v3.0.z part of the upgrade, you can either do the whole upgrade with Red Hat Quay down (Synchronous) or only bring down Red Hat Quay for a few minutes and have bulk of the upgrade continue with Red Hat Quay running (Background).
In a background upgrade, it could take much longer to run the upgrade (depending on how many tags need to be processed), but it takes less total downtime. The downside of a background upgrade is that you won’t have access to the latest features until the upgrade completes (the cluster runs from the quay v3 container in v2 compatibility mode until the upgrade is done).
See the Red Hat Quay Release Notes for information on v3 features.
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