knative

Knative Skill

Overview

Knative is an open-source Kubernetes-based platform for deploying and managing serverless workloads. It provides three main components:

Component	Purpose	Key Features
Serving	HTTP-triggered autoscaling runtime	Scale-to-zero, traffic splitting, revisions
Eventing	Event-driven architectures	Brokers, Triggers, Sources, CloudEvents
Functions	Simplified function deployment	func CLI, multi-language support

Current Version: v1.20.0 (as of late 2024)

When to Use This Skill

Use this skill when the user:

• Wants to deploy serverless workloads on Kubernetes
• Needs scale-to-zero autoscaling capabilities
• Is implementing event-driven architectures
• Needs traffic management (blue-green, canary, gradual rollout)
• Works with CloudEvents or event routing
• Mentions Knative Serving, Eventing, or Functions
• Asks about Brokers, Triggers, Sources, or Sinks
• Needs to configure networking layers (Kourier, Istio, Contour)

Quick Reference

Knative Service (Serving)

apiVersion: serving.knative.dev/v1
kind: Service
metadata:
  name: my-service
  namespace: default
spec:
  template:
    metadata:
      annotations:
        # Autoscaling configuration
        autoscaling.knative.dev/class: kpa.autoscaling.knative.dev
        autoscaling.knative.dev/min-scale: "0"
        autoscaling.knative.dev/max-scale: "10"
        autoscaling.knative.dev/target: "100"  # concurrent requests
    spec:
      containers:
        - image: gcr.io/my-project/my-app:latest
          ports:
            - containerPort: 8080
          resources:
            requests:
              cpu: 100m
              memory: 128Mi
            limits:
              memory: 128Mi  # Memory limit = request (required)
          # NO CPU limits (causes throttling)

Traffic Splitting

apiVersion: serving.knative.dev/v1
kind: Service
metadata:
  name: my-service
spec:
  template:
    # ... container spec
  traffic:
    # Blue-green: 100% to new or old
    - revisionName: my-service-00001
      percent: 90
    - revisionName: my-service-00002
      percent: 10
    # Or use latestRevision
    - latestRevision: true
      percent: 100