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Chapter 3. Overview of Red Hat Quay v3.0 Upgrade
Follow the procedure below if you are beginning with a Red Hat Quay v2 cluster. Before upgrading to the latest Red Hat Quay 3.x version, you must first migrate that cluster to v3.0.z, as described here. Once your cluster is running v3.0.z, you can then upgrade to the latest 3.x version by sequentially upgrading to each minor version in turn (3.0 to 3.1 to 3.2, etc…)
Before beginning your Red Hat Quay v2 to v3.0 upgrade, please note the following:
- Synchronous upgrade: For a synchronous upgrade, expect less than one hour of total downtime for small installations. Consider a small installation to contain a few thousand container image tags or fewer. For that size installation, you could probably get by with just a couple hours of scheduled downtime. The entire Red Hat Quay service is down for the duration, so if you were to try a synchronous upgrade on a registry with millions of tags, you could potentially be down for several days.
- Background upgrade: For a background upgrade (also called a compatibility mode upgrade), after a short shutdown your Red Hat Quay cluster upgrade runs in the background. For large Red Hat Quay registries, this could take weeks to complete, but the cluster continues to operate in v2 mode for the duration of the upgrade. As a point of reference, one Red Hat Quay v3 upgrade took four days to process approximately 30 million tags across six machines.
- Full features on completion: Before you have access to features associated with Docker version 2, schema 2 changes (such as support for containers of different architectures), the entire migration must complete. Other v3 features are immediately available when you switch over.
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Upgrade complete: When the upgrade is complete, you need to set V3_UPGRADE_MODE: complete in the Red Hat Quay
config.yamlfile for the new features to be available. All new Red Hat Quay v3 installations automatically have that set.
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