Release notes

OpenShift Serverless now uses Knative Serving 1.3.

OpenShift Serverless now uses Knative Eventing 1.3.

OpenShift Serverless now uses Kourier 1.3.

OpenShift Serverless now uses Knative kn CLI 1.3.

OpenShift Serverless now uses Knative Kafka 1.3.

The kn func CLI plug-in now uses func 0.24.

Init containers support for Knative services is now generally available (GA).

OpenShift Serverless logic is now available as a Developer Preview. It enables defining declarative workflow models for managing serverless applications.

Integrating OpenShift Serverless with Red Hat OpenShift Service Mesh causes the net-istio-controller pod to run out of memory on startup when too many secrets are present on the cluster.

The OpenShift Serverless Functions Technology Preview now uses Cloud Native Buildpacks by default to build container images.

The Federal Information Processing Standards (FIPS) mode is disabled for Kafka broker, Kafka source, and Kafka sink.

In OpenShift Serverless 1.23, support for KafkaBindings and the kafka-binding webhook were removed. However, an existing kafkabindings.webhook.kafka.sources.knative.dev MutatingWebhookConfiguration might remain, pointing to the kafka-source-webhook service, which no longer exists.

$ oc delete mutatingwebhookconfiguration kafkabindings.webhook.kafka.sources.knative.dev

OpenShift Serverless now uses Knative Serving 1.2.

OpenShift Serverless now uses Knative Eventing 1.2.

OpenShift Serverless now uses Kourier 1.2.

OpenShift Serverless now uses Knative (kn) CLI 1.2.

OpenShift Serverless now uses Knative Kafka 1.2.

The kn func CLI plug-in now uses func 0.24.

It is now possible to use the kafka.eventing.knative.dev/external.topic annotation with the Kafka broker. This annotation makes it possible to use an existing externally managed topic instead of the broker creating its own internal topic.

The kafka-ch-controller and kafka-webhook Kafka components no longer exist. These components have been replaced by the kafka-webhook-eventing component.

The OpenShift Serverless Functions Technology Preview now uses Source-to-Image (S2I) by default to build container images.

The Federal Information Processing Standards (FIPS) mode is disabled for Kafka broker, Kafka source, and Kafka sink.

If you delete a namespace that includes a Kafka broker, the namespace finalizer may fail to be removed if the broker’s auth.secret.ref.name secret is deleted before the broker.

Running OpenShift Serverless with a large number of Knative services can cause Knative activator pods to run close to their default memory limits of 600MB. These pods might be restarted if memory consumption reaches this limit. Requests and limits for the activator deployment can be configured by modifying the KnativeServing custom resource:

apiVersion: operator.knative.dev/v1alpha1
kind: KnativeServing
metadata:
  name: knative-serving
  namespace: knative-serving
spec:
  deployments:
  - name: activator
    resources:
    - container: activator
      requests:
        cpu: 300m
        memory: 60Mi
      limits:
        cpu: 1000m
        memory: 1000Mi

If you are using Cloud Native Buildpacks as the local build strategy for a function, kn func is unable to automatically start podman or use an SSH tunnel to a remote daemon. The workaround for these issues is to have a Docker or podman daemon already running on the local development computer before deploying a function.

On-cluster function builds currently fail for Quarkus and Golang runtimes. They work correctly for Node, Typescript, Python, and Springboot runtimes.

OpenShift Serverless now uses Knative Serving 1.1.

OpenShift Serverless now uses Knative Eventing 1.1.

OpenShift Serverless now uses Kourier 1.1.

OpenShift Serverless now uses Knative (kn) CLI 1.1.

OpenShift Serverless now uses Knative Kafka 1.1.

The kn func CLI plug-in now uses func 0.23.

Init containers support for Knative services is now available as a Technology Preview.

Persistent volume claim (PVC) support for Knative services is now available as a Technology Preview.

The knative-serving, knative-serving-ingress, knative-eventing and knative-kafka system namespaces now have the knative.openshift.io/part-of: "openshift-serverless" label by default.

The Knative Eventing - Kafka Broker/Trigger dashboard has been added, which allows visualizing Kafka broker and trigger metrics in the web console.

The Knative Eventing - KafkaSink dashboard has been added, which allows visualizing KafkaSink metrics in the web console.

The Knative Eventing - Broker/Trigger dashboard is now called Knative Eventing - Channel-based Broker/Trigger.

The knative.openshift.io/part-of: "openshift-serverless" label has substituted the knative.openshift.io/system-namespace label.

Naming style in Knative Serving YAML configuration files changed from camel case (ExampleName) to hyphen style (example-name). Beginning with this release, use the hyphen style notation when creating or editing Knative Serving YAML configuration files.

The Federal Information Processing Standards (FIPS) mode is disabled for Kafka broker, Kafka source, and Kafka sink.

OpenShift Serverless now uses Knative Serving 1.0

OpenShift Serverless now uses Knative Eventing 1.0.

OpenShift Serverless now uses Kourier 1.0.

OpenShift Serverless now uses Knative (kn) CLI 1.0.

OpenShift Serverless now uses Knative Kafka 1.0.

The kn func CLI plug-in now uses func 0.21.

The Kafka sink is now available as a Technology Preview.

The Knative open source project has begun to deprecate camel-cased configuration keys in favor of using kebab-cased keys consistently. As a result, the defaultExternalScheme key, previously mentioned in the OpenShift Serverless 1.18.0 release notes, is now deprecated and replaced by the default-external-scheme key. Usage instructions for the key remain the same.

In OpenShift Serverless 1.20.0, there was an event delivery issue affecting the use of kn event send to send events to a service. This issue is now fixed.

In OpenShift Serverless 1.20.0 (func 0.20), TypeScript functions created with the http template failed to deploy on the cluster. This issue is now fixed.

In OpenShift Serverless 1.20.0 (func 0.20), deploying a function using the gcr.io registry failed with an error. This issue is now fixed.

In OpenShift Serverless 1.20.0 (func 0.20), creating a Springboot function project directory with the kn func create command and then running the kn func build command failed with an error message. This issue is now fixed.

In OpenShift Serverless 1.19.0 (func 0.19), some runtimes were unable to build a function by using podman. This issue is now fixed.

Currently, the domain mapping controller cannot process the URI of a broker, which contains a path that is currently not supported.

apiVersion: serving.knative.dev/v1alpha1
kind: DomainMapping
metadata:
  name: <domain-name>
  namespace: knative-eventing
spec:
  ref:
    name: broker-ingress
    kind: Service
    apiVersion: v1

OpenShift Serverless now uses Knative Serving 0.26.

OpenShift Serverless now uses Knative Eventing 0.26.

OpenShift Serverless now uses Kourier 0.26.

OpenShift Serverless now uses Knative (kn) CLI 0.26.

OpenShift Serverless now uses Knative Kafka 0.26.

The kn func CLI plug-in now uses func 0.20.

The Kafka broker is now available as a Technology Preview.

The kn event plug-in is now available as a Technology Preview.

The --min-scale and --max-scale flags for the kn service create command have been deprecated. Use the --scale-min and --scale-max flags instead.

OpenShift Serverless deploys Knative services with a default address that uses HTTPS. When sending an event to a resource inside the cluster, the sender does not have the cluster certificate authority (CA) configured. This causes event delivery to fail, unless the cluster uses globally accepted certificates.

$ kn event send --to-url https://ce-api.foo.example.com/

$ kn event send --to Service:serving.knative.dev/v1:event-display

The Kafka broker currently does not work on a cluster with Federal Information Processing Standards (FIPS) mode enabled.

If you create a Springboot function project directory with the kn func create command, subsequent running of the kn func build command fails with this error message:

[analyzer] no stack metadata found at path ''
[analyzer] ERROR: failed to : set API for buildpack 'paketo-buildpacks/ca-certificates@3.0.2': buildpack API version '0.7' is incompatible with the lifecycle

Deploying a function using the gcr.io registry fails with this error message:

Error: failed to get credentials: failed to verify credentials: status code: 404

TypeScript functions created with the http template fail to deploy on the cluster.

buildEnvs: []

buildEnvs:
- name: BP_NODE_RUN_SCRIPTS
  value: build

In func version 0.20, some runtimes might be unable to build a function by using podman. You might see an error message similar to the following:

ERROR: failed to image: error during connect: Get "http://%2Fvar%2Frun%2Fdocker.sock/v1.40/info": EOF