When new versions of OpenShift Container Platform are released, you can upgrade your existing cluster to apply the latest enhancements and bug fixes. This includes upgrading from previous minor versions, such as release 3.2 to 3.3, and applying asynchronous errata updates within a minor version (3.3.z releases). See the OpenShift Container Platform 3.3 Release Notes to review the latest changes.
Due to the core architectural changes between the major versions, OpenShift Enterprise 2 environments cannot be upgraded to OpenShift Container Platform 3 and require a fresh installation.
Unless noted otherwise, node and masters within a major version are forward and backward compatible, so upgrading your cluster should go smoothly. However, you should not run mismatched versions longer than necessary to upgrade the entire cluster.
There are two methods for performing OpenShift Container Platform cluster upgrades. You can either do in-place upgrades (automated or manual), or upgrade using a blue-green deployment method.
With in-place upgrades, the cluster upgrade is performed on all hosts in a single cluster. If you installed using the quick or advanced installation and the ~/.config/openshift/installer.cfg.yml or inventory file that was used is available, you can perform an automated in-place upgrade. Alternatively, you can upgrade in-place manually.
With blue-green deployments, you can reduce downtime caused while upgrading an environment by creating a parallel environment on which the new deployment can be installed. If a problem is detected, and after the new deployment is verified, traffic can be switched over with the option to rollback.