Getting Started with Knative Serving¶

In this tutorial, we are going to use KonK to deploy a "Hello world" Service!This service will accept an environment variable, TARGET, and print "Hello $TARGET."

For those of you familiar with other source-to-url tools, this may seem familiar. However, since our "Hello world" Service is being deployed as a Knative Service, it gets some super powers (scale-to-zero, traffic-splitting) out of the box .

Deploying a your first Knative Service: "Hello world!"¶

kn

kn service create hello \
--image gcr.io/knative-samples/helloworld-go \
--port 8080 \
--env TARGET=world

YAML

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

Once you've created your YAML file (named something like "hello.yaml"):

kubectl apply -f hello.yaml

Expected Output¶

After Knative has successfully created your service, you should see the following:

Service hello created to latest revision <revision-name> is available at URL:
<service-url>

Where <revision-name> is the name of the Revision you've just created (we'll talk more about these later). Where <service-url> is the URL where your Knative Service can be reached.

Testing your deployment¶

curl <service-url>

Where <service-url> is the URL returned to you by the previous command.

The output should be:

Hello world!

Congratulations , you've just created your first Knative Service!

Tip

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