Perform in-place Kubernetes updates
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Perform in-place Kubernetes updates with a Blue/Green Deployment

Because Red Hat OpenShift is built on Kubernetes, it allows you to perform in-place updates of existing running applications. This feature means you can spin up a different version of an application—newer or older—and have the traffic automatically routed to that version. When done correctly, this can be used to create a zero-downtime deployment.

Put more succinctly: Kubernetes (and OpenShift) allow you to update an application with one simple command.