Knative-deploy

Step-by-step instructions to install Knative with Istio 1.0.2 on IBM Cloud Kubernetes Service(IKS), build and push your image to IBM Cloud Container Registry and deploy the app.

For up-to-date instructions, refer to this article on Medium

Prerequisites

• Node and npm
• Download and install the ibmcloud command line tool

Setup IBMCloud CLI

• Install the cs (container-service) and cr (container-registry) plugins

  ibmcloud plugin install container-service -r Bluemix
  ibmcloud plugin install container-registry -r Bluemix

• Authorize ibmcloud:

  ibmcloud login

• Setup environment variables

• Create a Kubernetes Cluster

• Knative depends on Istio.

  kubectl apply --filename https://raw.githubusercontent.com/knative/serving/master/third_party/istio-1.0.2/istio.yaml

• Label the default namespace with istio-injection=enabled: kubectl label namespace default istio-injection=enabled

• Monitor the Istio components until all of the components show a STATUS of Running or Completed: kubectl get pods --namespace istio-system

• Installing Knative components

Build your source into a container image and push using Kaniko

To Build a source into a container image from a Dockerfile inside a kubernetes cluster and push the image to IBM Cloud Container registry; all of this using Google's Kaniko tool, refer this link

OR

to build a container Image using Docker Daemon, follow the steps below

Build the app as a container image using Docker Daemon

Rehash of helloworld-nodejs

• Clone the repo

  git clone https://github.com/VidyasagarMSC/knative-deploy.git
  cd knative-deploy

• Install dependencies

  npm install

• Build and Push the Docker image to IBM Cloud Container Registry by replacing <region> and <namespace> values

  ibmcloud cr build -t registry.<region>.bluemix.net/<namespace>/knative-node-app .

• Open service.yaml, replace image and run the below command

  kubectl apply --filename service.yaml

Test your app

• To find the IP address for your service, use kubectl get svc knative-ingressgateway -n istio-system to get the ingress IP for your cluster. If your cluster is new, it may take sometime for the service to get asssigned an external IP address.

export IP_ADDRESS=$(kubectl get svc knative-ingressgateway --namespace istio-system --output 'jsonpath={.status.loadBalancer.ingress[0].ip}')

• To find the URL for your service, use kubectl get services.serving.knative.dev knative-node-app --output jsonpath='{.status.domain}'

export HOST_URL=$(kubectl get services.serving.knative.dev knative-node-app  --output jsonpath='{.status.domain}')

• Now you can make a request to your app to see the result.

 curl -H "Host: ${HOST_URL}" http://${IP_ADDRESS}
Node App running on IBM Cloud

Cleanup

• Run the below command to remove the sample app from your cluster

 kubectl delete --filename service.yaml

• To delete the cluster, enter the following command:

 ibmcloud cs cluster-rm $CLUSTER_NAME

Related Content

• Build a container image inside a K8s cluster and push it to IBM Cloud Container Registry
• Knative Monitoring