Rolling updates
Rolling updates, while quite simple to execute, are a vital part of the GKE story and ecosystem. Rolling updates are key, in that they support scenarios in GKE such as resiliency and continuous deployment. You will need to have deployed a multi-node container cluster in order to gain the benefits of rolling updates. The way they work involves a multistep process of removing each node from the pool, updating the image for that node, and then adding the updated node back into the pool. This process is repeated until each node in the cluster is running with the latest image.
GKE's rolling update mechanism ensures that your application remains up and available even as the system replaces instances of your old container image with ...
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