Creating a Service

You can create a Knative service by applying a YAML file or using the kn service create CLI command.

Prerequisites

To create a Knative service, you will need:

• A Kubernetes cluster with Knative Serving installed.
• Optional: To use the kn service create command, you must install the kn CLI.

Procedure

Tip

The following commands create a helloworld-go sample service. You can modify these commands, including the container image URL, to deploy your own application as a Knative service.

Create a sample service:

Apply YAML

kubectl apply -f - <<EOF
apiVersion: serving.knative.dev/v1
kind: Service
metadata:
 name: helloworld-go
 namespace: default
spec:
 template:
  spec:
   containers:
    - image: gcr.io/knative-samples/helloworld-go
      env:
        - name: TARGET
          value: "Go Sample v1"
EOF

kn CLI

kn service create helloworld-go --image gcr.io/knative-samples/helloworld-go

After the service has been created, Knative performs the following tasks:

• Creates a new immutable revision for this version of the app.
• Performs network programming to create a route, ingress, service, and load balancer for your app.
• Automatically scales your pods up and down based on traffic, including to zero active pods.