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This topic describes a highly available multi-cluster setup and the behavior to expect. It outlines the requirements of the high availability architecture and describes the benefits and tradeoffs. See Multi-cluster deployments (v2) for the introduction.
Patch upgrades can be deployed with zero-downtime.
Deploying different Keycloak major/minor versions on each of the sites is not supported. It is technically possible for upgrades to be rolled out to both sites simultaneously, however we recommend that upgrades be rolled out to one site at a time in order to simplify monitoring and debugging. Rollouts in the different sites should be done promptly to avoid older sites writing data that other sites assume to be already migrated.
For major or minor version upgrades:
Shut down all sites except one.
Deploy the new minor or major version in one site and verify the installation.
Deploy the new version in all other sites.