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. For more information, see Installing Knative Serving.
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 YAMLkn CLI

Create a YAML file using the following example:

apiVersion: serving.knative.dev/v1
kind: Service
metadata:
  name: helloworld-go
  namespace: default
spec:
  template:
    spec:
      containers:
        - image: ghcr.io/knative/helloworld-go:latest
          env:
            - name: TARGET
              value: "Go Sample v1"

Apply the YAML file by running the command:
```
kubectl apply -f <filename>.yaml
```
Where <filename> is the name of the file you created in the previous step.

kn service create helloworld-go --image ghcr.io/knative/helloworld-go:latest

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.