Use ECI in Knative services

Method 1: Directly create an ECI for a Knative Service

• If the virtual-node-affinity-injection=enabled label is not added to a namespace, you can create an ECI by setting the following configurations when you create resource objects for a Knative Service.
  • Specify the ECI specification in an annotation.
  • Specify virtual-kubelet in the nodeAffinity parameter.
  • Specify virtual-kubelet.io/provider in the tolerations parameter.
  Set the parameters based on the following template:

  apiVersion: serving.knative.dev/v1
  kind: Service
  metadata:
    name: helloworld-go
    namespace: vk
  spec:
    template:
      metadata:
        annotations:
          k8s.aliyun.com/eci-use-specs: "2-4Gi"
      spec:
        affinity:
          nodeAffinity:
            requiredDuringSchedulingIgnoredDuringExecution:
              nodeSelectorTerms:
              - matchExpressions:
                - key: type
                  operator: In
                  values: 
                  - virtual-kubelet   
        tolerations:
        - key: virtual-kubelet.io/provider
          operator: Exists                
        containers:
        - env:
          - name: TARGET
            value: "Knative"
          image: registry.cn-hangzhou.aliyuncs.com/knative-sample/helloworld-go:73fbdd56

• If the virtual-node-affinity-injection=enabled label is added to the namespace, you only need to specify the ECI specification in the annotation to directly create an ECI.

  kubectl label namespace vk virtual-node-affinity-injection=enabled

  Set the parameters in the following template:

  apiVersion: serving.knative.dev/v1
  kind: Service
  metadata:
    name: helloworld-go
    namespace: vk
  spec:
    template:
      metadata:
        annotations:
          k8s.aliyun.com/eci-use-specs: "2-4Gi"
      spec:         
        containers:
        - env:
          - name: TARGET
            value: "Knative"
          image: registry.cn-hangzhou.aliyuncs.com/knative-sample/helloworld-go:73fbdd56

Method 2: Specify an ECS instance to automatically create an ECI for a Knative Service

You can specify an Elastic Compute Service (ECS) instance with specified labels in the nodeAffinity parameter to automatically create an ECI for a Knative Service. This way, the pod is deployed in both the ECS instance and ECI.

1. Add a label to the ECS instance. For more information, see Manage node labels.
   The resource-role:ecs label is added to the ECS instance in this example.
2. In the resource object template, set the nodeAffinity parameter.
   Specify the label that is added to the ECS instance and virtual-kubelet in the nodeAffinity parameter.

   Set the parameters in the following template:

   apiVersion: serving.knative.dev/v1
   kind: Service
   metadata:
     name: helloworld-go
   spec:
     template:
       metadata:
         annotations:
           k8s.aliyun.com/eci-use-specs: "2-4Gi"
      spec:
         containerConcurrency: 10
         affinity:
           nodeAffinity:
             requiredDuringSchedulingIgnoredDuringExecution:
               nodeSelectorTerms:
               - matchExpressions:
                 - key: resource-role
                   operator: In
                   values:
                   - ecs
               - matchExpressions:
                 - key: type
                   operator: In
                   values: 
                   - virtual-kubelet
         tolerations:
         - key: virtual-kubelet.io/provider
           operator: Exists                 
         containers:
         - env:
           - name: TARGET
             value: "Knative"
           image: registry.cn-hangzhou.aliyuncs.com/knative-sample/helloworld-go:73fbdd56