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Buildpack Sample App

A sample app that demonstrates using Cloud Foundry buildpacks on Knative Serving, using the packs Docker images.

This deploys the .NET Core Hello World sample app for Cloud Foundry.

Prerequisites

Running

This sample uses the Buildpack build template in the build-templates repo. Save a copy of buildpack.yaml, then install it:

kubectl apply --filename https://raw.githubusercontent.com/knative/build-templates/master/buildpack/buildpack.yaml

Then you can deploy this to Knative Serving from the root directory by entering the following commands:

# Replace <your-project-here> with your own registry
export REPO="gcr.io/<your-project-here>"

perl -pi -e "s@DOCKER_REPO_OVERRIDE@$REPO@g" sample.yaml

# Create the Kubernetes resources
kubectl apply --filename sample.yaml

Once deployed, you will see that it first builds:

$ kubectl get revision --output yaml
apiVersion: v1
items:
- apiVersion: serving.knative.dev/v1alpha1
  kind: Revision
  ...
  status:
    conditions:
    - reason: Building
      status: "False"
      type: BuildComplete
...

Once the BuildComplete status is True, resource creation begins.

To access this service using curl, we first need to determine its ingress address:

$ watch kubectl get svc knative-ingressgateway --namespace istio-system
NAME                     TYPE           CLUSTER-IP     EXTERNAL-IP      PORT(S)                                      AGE
knative-ingressgateway   LoadBalancer   10.23.247.74   35.203.155.229   80:32380/TCP,443:32390/TCP,32400:32400/TCP   2d

Once the EXTERNAL-IP gets assigned to the cluster, enter the follow commands to capture the host URL and the IP of the ingress endpoint in environment variables:

# Put the Host name into an environment variable.
export SERVICE_HOST=`kubectl get route buildpack-sample-app --output jsonpath="{.status.domain}"`

# Put the ingress IP into an environment variable.
export SERVICE_IP=`kubectl get svc knative-ingressgateway --namespace istio-system --output jsonpath="{.status.loadBalancer.ingress[*].ip}"`

Now curl the service IP to make sure the deployment succeeded:

# Curl the ingress IP as if DNS were properly configured
curl --header "Host: $SERVICE_HOST" http://${SERVICE_IP}/
[response]

Cleaning up

To clean up the sample service:

# Clean up the serving resources
kubectl delete --filename serving/samples/buildpack-app-dotnet/sample.yaml
# Clean up the build template
kubectl delete buildtemplate buildpack