Deploying a Knative Service

In this tutorial, you will deploy a "Hello world" Knative Service that accepts the environment variable TARGET and prints Hello ${TARGET}!.

knYAML

Deploy the Service by running the command:

kn service create hello \
--image ghcr.io/knative/helloworld-go:latest \
--port 8080 \
--env TARGET=World

Expected output

Service hello created to latest revision 'hello-0001' is available at URL:
http://hello.default.${LOADBALANCER_IP}.sslip.io

The value of ${LOADBALANCER_IP} above depends on your type of cluster, for kind it will be 127.0.0.1 for minikube depends on the local tunnel.

1. Copy the following YAML into a file named hello.yaml:

   apiVersion: serving.knative.dev/v1
   kind: Service
   metadata:
     name: hello
   spec:
     template:
       spec:
         containers:
           - image: ghcr.io/knative/helloworld-go:latest
             ports:
               - containerPort: 8080
             env:
               - name: TARGET
                 value: "World"
   

2. Deploy the Knative Service by running the command:

   kubectl apply -f hello.yaml
   

   Expected output

   service.serving.knative.dev/hello created