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k8s-technical-requirements.md

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Technical Requirements for Kubernetes

The Kubernetes cluster on which you are deploying OpenWhisk must meet the following requirements:

  • Kubernetes version 1.9+. However, version 1.9.4 will not work for OpenWhisk due to a bug with volume mount subpaths (see[kubernetes-61076]). This bug will surface as a failure when deploying the nginx container.
  • The ability to create Ingresses to make a Kubernetes service available outside of the cluster so you can actually use OpenWhisk.
  • Unless you disable persistence (see docs/configurationChoices.md), either your cluster must be configured to support Dynamic Volume Provision and you must have a DefaultStorageClass admission controller enabled or you must manually create any necessary PersistentVolumes when deploying the Helm chart.
  • Endpoints of Kubernetes services must be able to loopback to themselves (the kubelet's hairpin-mode must not be none).