Rolling deployment #753
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Rolling deployment #753
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This allows the extra replica to handle traffic if a worker node dies. This may need to be bumped up again for production, but let's start with 2 as a baseline. https://user-guide.cloud-platform.service.justice.gov.uk/documentation/concepts/deploying.html#multiple-replicas
rollingUpdate (the default deployment strategy) means that when your deployment is updated, or your pods need to be moved to another node, the cluster will create new instances before terminating the old ones. maxSurge: 100% means that a complete additional copy of your deployment will be created before any of your old pods are terminated, and maxUnavailable: 50% means the cluster will only allow at most half of your pods being unavailable (e.g. if the new version of your service fails to deploy, for some reason). https://user-guide.cloud-platform.service.justice.gov.uk/documentation/concepts/deploying.html#zero-downtime-deploys
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jemnery
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In preparation for implementing horizontal pod autoscaling, enable multiple replicas and a rolling update deployment strategy.
https://user-guide.cloud-platform.service.justice.gov.uk/documentation/concepts/deploying.html#deploying-to-the-cloud-platform