Chapter 4. Getting started with Knative services

To create a service, you must create the service.yaml file.

You can copy the sample below. This sample will create a sample golang application called helloworld-go and allows you to specify the image for that application.

apiVersion: serving.knative.dev/v1alpha1 
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"

apiVersion: serving.knative.dev/v1alpha1 

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"

To deploy a serverless application, you must apply the service.yaml file.

Now that service has been created and the application has been deployed, Knative will create a new immutable revision for this version of the application.

Knative will also perform network programming to create a route, ingress, service, and load balancer for your application, and will automatically scale your pods up and down based on traffic, including inactive pods.