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PingSource example
This example shows how to configure PingSource as an event source targeting a Knative Service.
Before you begin
- Set up Knative Serving.
- Set up Knative Eventing.
Create a Knative Service
To verify that PingSource
is working, create a simple Knative
Service that dumps incoming messages to its log.
{{< tabs name="create-service” default="By YAML” >}} {{% tab name="By YAML” %}} Use following command to create the service from STDIN:
cat <<EOF | kubectl create -f -
apiVersion: serving.knative.dev/v1
kind: Service
metadata:
name: event-display
spec:
template:
spec:
containers:
- image: gcr.io/knative-releases/knative.dev/eventing-contrib/cmd/event_display
EOF
{{< /tab >}}
{{% tab name="By filename” %}}
Use following command to create the service from the service.yaml
file:
kubectl apply --filename service.yaml
{{< /tab >}} {{< /tabs >}}
Create a PingSource
For each set of ping events that you want to request, create an Event Source in the same namespace as the destination.
{{< tabs name="create-source” default="By YAML” >}} {{% tab name="By YAML” %}} Use following command to create the event source from STDIN:
cat <<EOF | kubectl create -f -
apiVersion: sources.knative.dev/v1beta1
kind: PingSource
metadata:
name: test-ping-source
spec:
schedule: "*/2 * * * *"
jsonData: '{"message": "Hello world!"}'
sink:
ref:
apiVersion: serving.knative.dev/v1
kind: Service
name: event-display
EOF
{{< /tab >}}
{{% tab name="By filename” %}}
Use following command to create the event source from the ping-source.yaml
file:
kubectl apply --filename ping-source.yaml
{{< /tab >}} {{< /tabs >}}
Verify
Verify that the message was sent to the Knative eventing system by looking at message dumper logs.
{{< tabs name="view-event” default="kubectl” >}} {{% tab name="kubectl” %}}
Use following command to view the logs of the event-display service:
kubectl logs -l serving.knative.dev/service=event-display -c user-container --since=10m
{{< /tab >}} {{% tab name="kail” %}}
You can also use kail
instead of kubectl logs
to tail the logs of the subscriber.
kail -l serving.knative.dev/service=event-display -c user-container --since=10m
{{< /tab >}} {{< /tabs >}}
You should see log lines showing the request headers and body from the source:
☁️ cloudevents.Event
Validation: valid
Context Attributes,
specversion: 1.0
type: dev.knative.sources.ping
source: /apis/v1/namespaces/default/pingsources/test-ping-source
id: d8e761eb-30c7-49a3-a421-cd5895239f2d
time: 2019-12-04T14:24:00.000702251Z
datacontenttype: application/json
Data,
{
"message": "Hello world!"
}
Cleanup
You can delete the PingSource instance by entering the following command:
{{< tabs name="delete-source” default="By name” >}} {{% tab name="By name” %}}
kubectl delete pingsources.sources.knative.dev test-ping-source
{{< /tab >}}
{{% tab name="By filename” %}}
kubectl delete --filename ping-source.yaml
{{< /tab >}} {{< /tabs >}}
Similarly, you can delete the Service instance via:
{{< tabs name="delete-service” default="By name” >}} {{% tab name="By name” %}}
kubectl delete service.serving.knative.dev event-display
{{< /tab >}} {{% tab name="By filename” %}}
kubectl delete --filename service.yaml
{{< /tab >}}
{{< /tabs >}}
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