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KNative

https://knative.dev

tip

KNative just has a service definition, no separate deployments and pods definitions are needed.

tip

Great with spot instances 👌

Invocation​

KNative can be invoked by:

  • Function's http endpoint
  • Event based (Kafka, SQS etc)
  • kn service invoke
  • PingSource / Cron event

Definitions​

Cmd
kn service create helloworld \
  --image gcr.io/your-project/helloworld \
  --request cpu=100m,memory=128Mi \
  --limit cpu=500m,memory=256Mi
apiVersion: serving.knative.dev/v1
kind: Service
metadata:
  name: helloworld
spec:
  template:
    spec:
      containers:
        - image: gcr.io/your-project/helloworld
          args: ["-text=Hello from Knative!"]
          ports:
            - containerPort: 8080
          resources:
            requests:
              cpu: "100m"
              memory: "128Mi"
            limits:
              cpu: "500m"
              memory: "256Mi"
KNative Global Resource Defaults
apiVersion: v1
kind: ConfigMap
metadata:
  name: config-defaults
  namespace: knative-serving
data:
  container-request-cpu: "200m"
  container-request-memory: "256Mi"

PingSource​

kubectl apply -f ping-source.yaml

kubectl logs -l serving.knative.dev/service=helloworld --tail=100 --since=5m
kubectl describe pingsource ping-source
PingSource
apiVersion: sources.knative.dev/v1
kind: PingSource
metadata:
  name: ping-source
spec:
  schedule: "*/1 * * * *"  # every minute
  data: '{"message": "Hello from Ping!"}'
  sink:
    ref:
      apiVersion: serving.knative.dev/v1
      kind: Service
      name: helloworld