Container Service for Kubernetes:Use elastic container instances in Knative

Prerequisites

• Knative is deployed in your cluster. For more information, see Deploy Knative.

• The ack-virtual-node component is deployed. This component is required when you use elastic container instances. For more information, see Deploy ack-virtual-node in the cluster.

Procedure

1. Create a Knative Service, add the alibabacloud.com/eci=true label to the Service, and add the k8s.aliyun.com/eci-use-specs annotation to specify the type of elastic container instance to be used. Then, run the kubectl apply command to deploy the YAML file.

   Sample template:

   apiVersion: serving.knative.dev/v1
   kind: Service
   metadata:
     name: helloworld-go
     namespace: vk
   spec:
     template:
       metadata:
         labels:
           alibabacloud.com/eci: "true" # Add the label.
         annotations:
           k8s.aliyun.com/eci-use-specs: "2-4Gi" # Specify the type of elastic container instance.
       spec:         
         containers:
         - env:
           - name: TARGET
             value: "Knative"
           image: registry.cn-hangzhou.aliyuncs.com/knative-sample/helloworld-go:73fbdd56

2. After you complete the configuration, run the following command to verify that the configuration is successful:

   kubectl -n vk get pod -o wide

   Expected output:

   NAME                                              READY   STATUS    RESTARTS   AGE   IP             NODE                 NOMINATED NODE   READINESS GATES
   helloworld-go-dqqhv-deployment-6d54c9c8dc-hkjwn   2/2     Running   0          40s   192.XX.0.80   virtual-node-eci-0   <none>           <none>

   The output indicates the two Elastic Container Instance-based pods are created.

References

• When you use Knative, if you want to automatically scale out Elastic Container Instance-based pods to handle traffic spikes and use Elastic Compute Service (ECS)-based pods in the remaining time, see Use both ECS instances and elastic container instances in Knative.

• You can use the image cache feature provided by Elastic Container Instance to accelerate image pulls and reduce instance creation time. For more information, see Use image caches to accelerate pod creation for Knative Services.