Container Service for Kubernetes:Use Knative Eventing to send messages

Step 1: Deploy a message processing Service and a home page

The message processing Service handles live comment requests and scales automatically based on demand. The home page facilitates the sending and receiving of live comments. Use the following steps to deploy these two Services:

1. Log on to the ACK console. In the left-side navigation pane, click Clusters.

2. On the Clusters page, find the cluster that you want to manage and click its name. In the left-side navigation pane, choose Applications > Knative.

3. On the Knative page, click the Services tab, then click Create from Template.

   The following YAML template creates a Service named danmu-message. Replace the image field in the example code with one that corresponds to the region of your cluster. This example uses the China (Beijing) region.

   apiVersion: serving.knative.dev/v1
   kind: Service
   metadata:
     name: danmu-message
     namespace: default
   spec:
     template:
       metadata:
         annotations:
           autoscaling.knative.dev/maxScale: "10"
           autoscaling.knative.dev/minScale: "1"
       spec:
         containerConcurrency: 2
         containers:
           - args:
               - /message
               - --url=http://danmu-portal.default.svc.cluster.local/api/result
             env:
               - name: POD_NAME
                 valueFrom:
                   fieldRef:
                     fieldPath: metadata.name
             image: registry-vpc.cn-beijing.aliyuncs.com/acs/knative-danmu-message:v1.0
             name: user-container
             ports:
               - containerPort: 8080
                 name: http1

4. Repeat the previous step. Clear the template content, paste the following YAML template to create a homepage, and click Create.

   The following YAML template creates a Service named danmu-portal. Replace the image field specified in the sample code with one that corresponds to the region of the cluster.

   apiVersion: serving.knative.dev/v1
   kind: Service
   metadata:
     name: danmu-portal
     namespace: default
   spec:
     template:
       metadata:
         annotations:
           autoscaling.knative.dev/maxScale: "1"
           autoscaling.knative.dev/minScale: "1"
       spec:
         containers:
           - image: registry-vpc.cn-beijing.aliyuncs.com/acs/knative-danmu-portal:v1.0
             name: user-container
             args:
             - /danmu
             - --url=http://danmu-message.default.svc.cluster.local/web/api/process
             ports:
               - containerPort: 8080
                 name: http1

5. On the Services tab, when both danmu-message and danmu-portal display a Created state, the Services are deployed successfully.

   Record the IP address of the Gateway for use in the following step.

Step 2: Bind the gateway address and domain name

After deploying the message processing Service and homepage, bind the recorded gateway address to the domain name of the homepage, danmu-portal.default.example.com. This domain name is used for sending and receiving live comments.

To access the Service through the domain name, locate the Hosts file on your computer and add the binding information. The binding information is in the following format: <gateway IP>, followed by a space and the domain name. For example, 47.96.XX.XX danmu-portal.default.example.com.

Step 3: Deploy the Service

Enter the domain name http://danmu-portal.default.example.com into your browser to access the live comment service. Configure the following parameters on the page and click Send to view live comments. You can also monitor the extracted pod information in the pod list.