mirror of https://github.com/knative/docs.git
Apache kafka (#1712)
* Adding Kafka samples for channel and source
Co-Authored-By: RichieEscarez <rescarez@google.com>
* fixing selector bug ... 🔥
This commit is contained in:
Matthias Wessendorf
Knative Prow Robot
parent
1359104439
commit
69b071c47d
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The following examples will help you understand how to use the different Apache Kafka components for Knative.
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## Prerequisites
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All examples require:
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- A Kubernetes cluster with
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- Knative Eventing v0.9+
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- Knative Serving v0.9+
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- An Apache Kafka cluster
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If you want to run the Apache Kafka cluster on Kubernetes, the simplest option is to install it by using Strimzi. Check out the [Quickstart](https://strimzi.io/quickstarts/) guides for both Minikube and Openshift. You can also install Kafka on the host.
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## Examples
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A number of different examples, showing the `KafkaSource` and the `KafkaChannel` can be found here:
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- [`KafkaSource` to `Service`](./source/README.md)
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- [`KafkaChannel` and Broker](./channel/README.md)
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---
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title: "Apache Kafka examples"
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linkTitle: "Apache Kafka"
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weight: 10
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type: "docs"
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---
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{{% readfile file="README.md" relative="true" markdown="true" %}}
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apiVersion: serving.knative.dev/v1
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kind: Service
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metadata:
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name: broker-kafka-display
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spec:
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template:
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spec:
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containers:
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- image: gcr.io/knative-releases/github.com/knative/eventing-contrib/cmd/event_display@sha256:1d6ddc00ab3e43634cd16b342f9663f9739ba09bc037d5dea175dc425a1bb955
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apiVersion: v1
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kind: ServiceAccount
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metadata:
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name: events-sa
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namespace: default
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRole
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metadata:
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name: event-watcher
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rules:
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- apiGroups:
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- ""
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resources:
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- events
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verbs:
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- get
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- list
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- watch
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRoleBinding
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metadata:
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name: k8s-ra-event-watcher
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roleRef:
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apiGroup: rbac.authorization.k8s.io
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kind: ClusterRole
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name: event-watcher
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subjects:
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- kind: ServiceAccount
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name: events-sa
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namespace: default
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apiVersion: sources.eventing.knative.dev/v1alpha1
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kind: ApiServerSource
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metadata:
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name: testevents-kafka-03
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namespace: default
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spec:
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serviceAccountName: events-sa
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mode: Resource
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resources:
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- apiVersion: v1
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kind: Event
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sink:
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apiVersion: eventing.knative.dev/v1alpha1
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kind: Broker
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name: default
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apiVersion: eventing.knative.dev/v1alpha1
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kind: Trigger
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metadata:
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name: testevents-trigger
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namespace: default
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spec:
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subscriber:
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ref:
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apiVersion: serving.knative.dev/v1
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kind: Service
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name: broker-kafka-display
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# Apache Kafka CRD default channel
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You can install and configure the Apache Kafka CRD (`KafkaChannel`) as the default channel configuration in Knative Eventing.
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## Prerequisites
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You must ensure that you meet the [prerequisites listed in the Apache Kafka overview](../README.md).
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You must also have the following tools installed:
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- `curl`
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- `sed`
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## Creating a `KafkaChannel` channel CRD
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Install the `KafkaChannel` sub-component on your Knative Eventing cluster:
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```
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curl -L "https://github.com/knative/eventing-contrib/releases/download/v0.9.0/kafka-channel.yaml" \
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| sed 's/REPLACE_WITH_CLUSTER_URL/my-cluster-kafka-bootstrap.kafka:9092/' \
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| kubectl apply --filename -
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```
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> Note: The above assumes that you have Apache Kafka installed in the `kafka`, as discussed [here](../README.md)!
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Once the `KafkaChannel` API is available, create a new object by configuring the YAML file as follows:
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```
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cat <<-EOF | kubectl apply -f -
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---
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apiVersion: messaging.knative.dev/v1alpha1
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kind: KafkaChannel
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metadata:
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name: my-kafka-channel
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spec:
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numPartitions: 1
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replicationFactor: 3
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EOF
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```
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You can now set the `KafkaChannel` CRD as the default channel configuration.
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## Specifying the default channel configuration
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To configure the usage of the `KafkaChannel` CRD as the [default channel configuration](channels/default-channels.md), edit the `default-ch-webhook` ConfigMap as follows:
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```
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cat <<-EOF | kubectl apply -f -
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---
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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: default-ch-webhook
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namespace: knative-eventing
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data:
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# Configuration for defaulting channels that do not specify CRD implementations.
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default-ch-config: |
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clusterDefault:
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apiVersion: messaging.knative.dev/v1alpha1
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kind: KafkaChannel
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EOF
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```
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## Creating an Apache Kafka channel using the default channel configuration
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Now that `KafkaChannel` is set as the default channel configuration, you can use the `channels.messaging.knative.dev` CRD to create a new Apache Kafka channel, using the generic `Channel`:
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```
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cat <<-EOF | kubectl apply -f -
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---
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apiVersion: messaging.knative.dev/v1alpha1
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kind: Channel
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metadata:
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name: testchannel-one
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EOF
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```
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Check Kafka for a `testchannel` topic. With Strimzi this can be done by using the command:
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```
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kubectl -n kafka exec -it my-cluster-kafka-0 -- bin/kafka-topics.sh --zookeeper localhost:2181 --list
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```
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The result is:
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```
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...
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knative-messaging-kafka.default.testchannel-one
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...
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```
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The Apache Kafka topic that is created by the channel implementation is prefixed with `knative-messaging-kafka`. This indicates it is an Apache Kafka channel from Knative. It contains the name of the namespace, `default` in this example, followed by the actual name of the channel.
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## Configuring the Knative broker for Apache Kafka channels
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To setup a broker that will use the new default Kafka channels, you must inject a new _default_ broker, using the command:
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```
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kubectl label namespace default knative-eventing-injection=enabled
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```
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This will give you two pods, such as:
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```
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default-broker-filter-64658fc79f-nf596 1/1 Running 0 15m
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default-broker-ingress-ff79755b6-vj9jt 1/1 Running 0 15m
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```
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Inside the Apache Kafka cluster you should see two new topics, such as:
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```
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...
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knative-messaging-kafka.default.default-kn2-ingress
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knative-messaging-kafka.default.default-kn2-trigger
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...
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```
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## Creating a service and trigger to use the Apache Kafka broker
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To use the Apache Kafka based broker, let's take a look at a simple demo. Use the`ApiServerSource` to publish events to the broker as well as the `Trigger` API, which then routes events to a Knative `Service`.
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1. Install `ksvc`, using the command:
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```
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kubectl apply -f 000-ksvc.yaml
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```
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2. Install a source that publishes to the default broker
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```
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kubectl apply --filename 020-k8s-events.yaml
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```
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3. Create a trigger that routes the events to the `ksvc`:
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```
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kubectl apply -f 030-trigger.yaml
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```
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## Verifying your Apache Kafka channel and broker
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Now that your Eventing cluster is configured for Apache Kafka, you can verify
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your configuration with the following options.
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### Receive events via Knative
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Now you can see the events in the log of the `ksvc` using the command:
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```
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kubectl logs --selector='serving.knative.dev/service=broker-kafka-display' -c user-container
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```
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# Apache Kafka - Source Example
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Tutorial on how to build and deploy a `KafkaSource` [Eventing source](../../../sources/README.md) using a Knative Serving `Service`.
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## Prerequisites
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You must ensure that you meet the [prerequisites listed in the Apache Kafka overview](../README.md).
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## Creating a `KafkaSource` source CRD
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1. Install the `KafkaSource` sub-component to your Knative cluster:
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```
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kubectl apply -f https://github.com/knative/eventing-contrib/releases/download/v0.9.0/kafka-importer.yaml
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```
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2. Check that the `kafka-controller-manager-0` pod is running.
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```
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kubectl get pods --namespace knative-sources
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NAME READY STATUS RESTARTS AGE
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kafka-controller-manager-0 1/1 Running 0 42m
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```
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3. Check the `kafka-controller-manager-0` pod logs.
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```
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$ kubectl logs kafka-controller-manager-0 -n knative-sources
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2019/03/19 22:25:54 Registering Components.
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2019/03/19 22:25:54 Setting up Controller.
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2019/03/19 22:25:54 Adding the Apache Kafka Source controller.
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2019/03/19 22:25:54 Starting Apache Kafka controller.
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```
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### Apache Kafka Topic (Optional)
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1. If using Strimzi, you can set a topic modifying
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`source/kafka-topic.yaml` with your desired:
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- Topic
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- Cluster Name
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- Partitions
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- Replicas
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```yaml
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apiVersion: kafka.strimzi.io/v1alpha1
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kind: KafkaTopic
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metadata:
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name: knative-demo-topic
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namespace: kafka
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labels:
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strimzi.io/cluster: my-cluster
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spec:
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partitions: 3
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replicas: 1
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config:
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retention.ms: 7200000
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segment.bytes: 1073741824
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```
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2. Deploy the `KafkaTopic`
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```shell
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$ kubectl apply -f kafka/source/samples/strimzi-topic.yaml
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kafkatopic.kafka.strimzi.io/knative-demo-topic created
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```
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3. Ensure the `KafkaTopic` is running.
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```shell
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$ kubectl -n kafka get kafkatopics.kafka.strimzi.io
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NAME AGE
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knative-demo-topic 16s
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```
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### Create the Event Display service
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1. Build and deploy the Event Display Service.
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```
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$ kubectl apply --filename source/samples/event-display.yaml
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...
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service.serving.knative.dev/event-display created
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```
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1. Ensure that the Service pod is running. The pod name will be prefixed with
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`event-display`.
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```
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$ kubectl get pods
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NAME READY STATUS RESTARTS AGE
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event-display-00001-deployment-5d5df6c7-gv2j4 2/2 Running 0 72s
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...
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```
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#### Apache Kafka Event Source
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1. Modify `source/event-source.yaml` accordingly with bootstrap
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servers, topics, etc...:
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```yaml
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apiVersion: sources.eventing.knative.dev/v1alpha1
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kind: KafkaSource
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metadata:
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name: kafka-source
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spec:
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consumerGroup: knative-group
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bootstrapServers: my-cluster-kafka-bootstrap.kafka:9092 #note the kafka namespace
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topics: knative-demo-topic
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sink:
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apiVersion: serving.knative.dev/v1alpha1
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kind: Service
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name: event-display
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```
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1. Deploy the event source.
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```
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$ kubectl apply -f kafka/source/samples/event-source.yaml
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...
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kafkasource.sources.eventing.knative.dev/kafka-source created
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```
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1. Check that the event source pod is running. The pod name will be prefixed
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with `kafka-source`.
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```
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$ kubectl get pods
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NAME READY STATUS RESTARTS AGE
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kafka-source-xlnhq-5544766765-dnl5s 1/1 Running 0 40m
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```
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1. Ensure the Apache Kafka Event Source started with the necessary
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configuration.
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```
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$ kubectl logs --selector='knative-eventing-source-name=kafka-source'
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{"level":"info","ts":"2019-04-01T19:09:32.164Z","caller":"receive_adapter/main.go:97","msg":"Starting Apache Kafka Receive Adapter...","Bootstrap Server":"...","Topics":".","ConsumerGroup":"...","SinkURI":"...","TLS":false}
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```
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### Verify
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1. Produce a message (`{"msg": "This is a test!"}`) to the Apache Kafka topic, like shown below:
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```
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kubectl -n kafka run kafka-producer -ti --image=strimzi/kafka:0.14.0-kafka-2.3.0 --rm=true --restart=Never -- bin/kafka-console-producer.sh --broker-list my-cluster-kafka-bootstrap:9092 --topic my-topic
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If you don't see a command prompt, try pressing enter.
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>{"msg": "This is a test!"}
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```
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1. Check that the Apache Kafka Event Source consumed the message and sent it to
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its sink properly.
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```
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$ kubectl logs --selector='knative-eventing-source-name=kafka-source'
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...
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{"level":"info","ts":"2019-04-15T20:37:24.702Z","caller":"receive_adapter/main.go:99","msg":"Starting Apache Kafka Receive Adapter...","bootstrap_server":"...","Topics":"knative-demo-topic","ConsumerGroup":"knative-group","SinkURI":"...","TLS":false}
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{"level":"info","ts":"2019-04-15T20:37:24.702Z","caller":"adapter/adapter.go:100","msg":"Starting with config: ","bootstrap_server":"...","Topics":"knative-demo-topic","ConsumerGroup":"knative-group","SinkURI":"...","TLS":false}
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{"level":"info","ts":1553034726.546107,"caller":"adapter/adapter.go:154","msg":"Successfully sent event to sink"}
|
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```
|
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|
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1. Ensure the Event Display received the message sent to it by the Event Source.
|
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|
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```
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$ kubectl logs --selector='serving.knative.dev/service=event-display' -c user-container
|
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|
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☁️ CloudEvent: valid ✅
|
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Context Attributes,
|
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SpecVersion: 0.2
|
||||
Type: dev.knative.kafka.event
|
||||
Source: dubee
|
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ID: partition:0/offset:333
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||||
Time: 2019-03-19T22:32:06.535321588Z
|
||||
ContentType: application/json
|
||||
Extensions:
|
||||
key:
|
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Transport Context,
|
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URI: /
|
||||
Host: event-display.default.svc.cluster.local
|
||||
Method: POST
|
||||
Data,
|
||||
{
|
||||
"msg": "This is a test!"
|
||||
}
|
||||
```
|
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|
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## Teardown Steps
|
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|
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1. Remove the Apache Kafka Event Source
|
||||
```
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$ kubectl delete -f source/source.yaml
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kafkasource.sources.eventing.knative.dev "kafka-source" deleted
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||||
```
|
||||
2. Remove the Event Display
|
||||
```
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$ kubectl delete -f source/event-display.yaml
|
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service.serving.knative.dev "event-display" deleted
|
||||
```
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||||
3. Remove the Apache Kafka Event Controller
|
||||
```
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$ kubectl delete -f https://github.com/knative/eventing-contrib/releases/download/v0.9.0/kafka-importer.yaml
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serviceaccount "kafka-controller-manager" deleted
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clusterrole.rbac.authorization.k8s.io "eventing-sources-kafka-controller" deleted
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clusterrolebinding.rbac.authorization.k8s.io "eventing-sources-kafka-controller" deleted
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customresourcedefinition.apiextensions.k8s.io "kafkasources.sources.eventing.knative.dev" deleted
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service "kafka-controller" deleted
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statefulset.apps "kafka-controller-manager" deleted
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```
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4. (Optional) Remove the Apache Kafka Topic
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||||
|
||||
```shell
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$ kubectl delete -f kafka/source/samples/kafka-topic.yaml
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||||
kafkatopic.kafka.strimzi.io "knative-demo-topic" deleted
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||||
```
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|
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@ -0,0 +1,25 @@
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# Copyright 2019 The Knative Authors
|
||||
#
|
||||
# Licensed under the Apache License, Version 2.0 (the "License");
|
||||
# you may not use this file except in compliance with the License.
|
||||
# You may obtain a copy of the License at
|
||||
#
|
||||
# http://www.apache.org/licenses/LICENSE-2.0
|
||||
#
|
||||
# Unless required by applicable law or agreed to in writing, software
|
||||
# distributed under the License is distributed on an "AS IS" BASIS,
|
||||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
# See the License for the specific language governing permissions and
|
||||
# limitations under the License.
|
||||
|
||||
apiVersion: serving.knative.dev/v1
|
||||
kind: Service
|
||||
metadata:
|
||||
name: event-display
|
||||
spec:
|
||||
runLatest:
|
||||
configuration:
|
||||
revisionTemplate:
|
||||
spec:
|
||||
container:
|
||||
image: gcr.io/knative-releases/github.com/knative/eventing-contrib/cmd/event_display@sha256:1d6ddc00ab3e43634cd16b342f9663f9739ba09bc037d5dea175dc425a1bb955
|
||||
|
|
@ -0,0 +1,75 @@
|
|||
# Copyright 2019 The Knative Authors
|
||||
#
|
||||
# Licensed under the Apache License, Version 2.0 (the "License");
|
||||
# you may not use this file except in compliance with the License.
|
||||
# You may obtain a copy of the License at
|
||||
#
|
||||
# http://www.apache.org/licenses/LICENSE-2.0
|
||||
#
|
||||
# Unless required by applicable law or agreed to in writing, software
|
||||
# distributed under the License is distributed on an "AS IS" BASIS,
|
||||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
# See the License for the specific language governing permissions and
|
||||
# limitations under the License.
|
||||
|
||||
# Replace the following before applying this file:
|
||||
# KAFKA_CONSUMER_GROUP_NAME: Name of Kafka consumer group
|
||||
# KAFKA_BOOTSTRAP_SERVERS: Comma-separated list of bootstrap servers
|
||||
# KAFKA_TOPICS: Comma-separated list of topics
|
||||
# KAFKA_SASL_ENABLE: Truthy value to enable/disable SASL, disabled by default (optional)
|
||||
# KAFKA_SASL_USER_SECRET_NAME: Name of secret containing SASL user (optional)
|
||||
# KAFKA_SASL_USER_SECRET_KEY: Key within secret containing SASL user (optional)
|
||||
# KAFKA_SASL_PASSWORD_SECRET_NAME: Name of secret containing SASL password (optional)
|
||||
# KAFKA_SASL_PASSWORD_SECRET_KEY: Key within secret containing SASL password (optional)
|
||||
# KAFKA_TLS_ENABLE: Truthy to enable TLS, disabled by default (optional)
|
||||
# KAFKA_TLS_CERT_SECRET_NAME: Name of secret containing client cert to use when connecting wtih TLS (optional)
|
||||
# KAFKA_TLS_CERT_SECRET_KEY: Key within secret containing client cert to use when connecting wtih TLS (optional)
|
||||
# KAFKA_TLS_KEY_SECRET_NAME: Name of secret containing client key to use when connecting wtih TLS (optional)
|
||||
# KAFKA_TLS_KEY_SECRET_KEY: Key within secret containing client key to use when connecting wtih TLS (optional)
|
||||
# KAFKA_TLS_CA_CERT_SECRET_NAME: Name of secret containing server CA cert to use when connecting wtih TLS (optional)
|
||||
# KAFKA_TLS_CA_CERT_SECRET_KEY: Key within secret containing server CA cert to use when connecting wtih TLS (optional)
|
||||
|
||||
apiVersion: sources.eventing.knative.dev/v1alpha1
|
||||
kind: KafkaSource
|
||||
metadata:
|
||||
name: kafka-source
|
||||
spec:
|
||||
consumerGroup: KAFKA_CONSUMER_GROUP_NAME
|
||||
bootstrapServers: KAFKA_BOOTSTRAP_SERVERS
|
||||
topics: KAFKA_TOPICS
|
||||
net:
|
||||
sasl:
|
||||
enable: KAFKA_SASL_ENABLE
|
||||
user:
|
||||
secretKeyRef:
|
||||
name: KAFKA_SASL_USER_SECRET_NAME
|
||||
key: KAFKA_SASL_USER_SECRET_KEY
|
||||
password:
|
||||
secretKeyRef:
|
||||
name: KAFKA_SASL_PASSWORD_SECRET_NAME
|
||||
key: KAFKA_SASL_PASSWORD_SECRET_KEY
|
||||
tls:
|
||||
enable: KAFKA_TLS_ENABLE
|
||||
cert:
|
||||
secretKeyRef:
|
||||
name: KAFKA_TLS_CERT_SECRET_NAME
|
||||
key: KAFKA_TLS_CERT_SECRET_KEY
|
||||
key:
|
||||
secretKeyRef:
|
||||
name: KAFKA_TLS_KEY_SECRET_NAME
|
||||
key: KAFKA_TLS_KEY_SECRET_KEY
|
||||
caCert:
|
||||
secretKeyRef:
|
||||
name: KAFKA_TLS_CA_CERT_SECRET_NAME
|
||||
key: KAFKA_TLS_CA_CERT_SECRET_KEY
|
||||
resources:
|
||||
limits:
|
||||
cpu: 250m
|
||||
memory: 512Mi
|
||||
requests:
|
||||
cpu: 250m
|
||||
memory: 512Mi
|
||||
sink:
|
||||
apiVersion: serving.knative.dev/v1alpha1
|
||||
kind: Service
|
||||
name: event-display
|
||||
|
|
@ -0,0 +1,27 @@
|
|||
# Copyright 2019 The Knative Authors
|
||||
#
|
||||
# Licensed under the Apache License, Version 2.0 (the "License");
|
||||
# you may not use this file except in compliance with the License.
|
||||
# You may obtain a copy of the License at
|
||||
#
|
||||
# http://www.apache.org/licenses/LICENSE-2.0
|
||||
#
|
||||
# Unless required by applicable law or agreed to in writing, software
|
||||
# distributed under the License is distributed on an "AS IS" BASIS,
|
||||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
# See the License for the specific language governing permissions and
|
||||
# limitations under the License.
|
||||
|
||||
apiVersion: kafka.strimzi.io/v1alpha1
|
||||
kind: KafkaTopic
|
||||
metadata:
|
||||
name: knative-demo-topic
|
||||
namespace: kafka
|
||||
labels:
|
||||
strimzi.io/cluster: my-cluster
|
||||
spec:
|
||||
partitions: 3
|
||||
replicas: 1
|
||||
config:
|
||||
retention.ms: 7200000
|
||||
segment.bytes: 1073741824
|
||||
Loading…
Reference in New Issue