serverless-arch.md

• Kubeless

  • Functions are represented as Custom Resource Definitions (CRD)
    • A custom resource is an extension of Kubernetes API (new kind of object)
    • A CRD groups together custom resources of one type
    • Controller running as a service, checks for changes to CRD
  • Serverless function deployed using ConfigMaps
  • Kafka/Zookeeper running to handle events
  • Init container used to handle dependencies (such as runtime for function)
  • kubeless deploys the controller, Kafka to initialize
  • How are functions triggered?
    • Through HTTP requests
      • The container running the function has a REST wrapper
    • Through events
      • Topics created on Kafka broker
      • An event goes to a specific topic
      • Function is triggered when event is published

• Reading

  • Kubeless Architecture
  • Kubernetes Custom Resources
  • See video middle part: Serverless on Kubernetes with Kubeless [A]